Equipment and method for recycling wastewater that meets standards and treating liquids with zero discharge

Abstract

The present invention relates to a device and method for treating wastewater that meets the standards and zero liquid discharge. First, the wastewater that meets the standards is treated to COD by using an aerated biological filter tank through a pre-treatment system. Cr ≤40 mg / L, BOD5≤5mg / L, and get miscellaneous water, and then treat the sewage to a total hardness of ≤50mg / L, suspended solids ≤1mg / L; secondly, the pre-treatment effluent is primary concentrated and desalted through a low-pressure reverse osmosis system; and then the low-pressure reverse osmosis concentrated water is treated to a total hardness of ≤5mg / L, COD Cr ≤10mg / L, SiO2≤5mg / L, SS≤1mg / L; finally, through the concentration and evaporation system, medium-pressure reverse osmosis and high-pressure reverse osmosis are used in turn for concentration and reduction, and MVR is used to evaporate the mixed salt and purify the recycled water with TDS≤300mg / L; thereby achieving the purpose of standard sewage resource utilization and zero liquid discharge.

Description

Technical Field

[0001] The present invention relates to a device and method for resource utilization of qualified sewage and liquid zero-discharge treatment, belonging to the technical field of wastewater resource utilization. Background Art

[0002] With the rapid development of social economy, large amounts of water are consumed in industry, agriculture and daily life, and the problem of water shortage is becoming increasingly serious. However, most urban sewage treatment plants and industrial park sewage treatment plants directly discharge the qualified sewage, wasting precious water resources. Cr (chemical oxygen demand), BOD5 (biological oxygen demand), SS (suspended solids), TDS (total dissolved solids), TH (total hardness, in terms of CaCO3), Cl - (chloride ion), SO4 2- (sulfate ions), etc., are reused as urban miscellaneous water and industrial circulating cooling water; the existing deep treatment methods are to add drugs, coagulation, sedimentation, filtration, ultrafiltration and reverse osmosis to the qualified sewage, but the discharge of high-salt concentrated water from reverse osmosis will cause water pollution; a new qualified sewage resource treatment technology that integrates deep treatment, purification and desalination, and concentrated water evaporation and crystallization is needed to achieve the quality reuse of produced water and zero liquid discharge. Summary of the invention

[0003] The present invention proposes a device and method for recycling qualified sewage and treating liquid with zero discharge. The purpose is to solve the problem that only a few indicators of qualified sewage from urban sewage treatment plants or industrial park sewage treatment plants exceed the standards of urban miscellaneous water and industrial circulating cooling water, and directly discharge and waste water resources. At the same time, considering the shortcomings of conventional reuse treatment of reverse osmosis high-salt concentrated water causing environmental impact again, the water quality indicators of qualified sewage from urban sewage treatment plants are mainly COD Cr ≤50mg / L, BOD5≤10mg / L, SS≤10mg / L, TDS≤1000mg / L, TH≤500mg / L, Cl - ≤350mg / L, SO4 2- ≤500mg / L, the water quality index of the industrial park sewage treatment plant that meets the standards is mainly COD Cr ≤100mg / L, BOD5≤20mg / L, SS≤50mg / L, TDS≤2000mg / L, TH≤500mg / L, Cl - ≤350mg / L, SO4 2- ≤500mg / L; firstly, the aerated biological filter is used to further reduce the COD of the sewage that meets the standard CrThe BOD5 value meets the water quality requirements of GB / T 18920-2020 for urban sewage recycling and urban miscellaneous water, which are BOD5≤10mg / L, TDS≤1000mg / L, Cl - ≤350mg / L, SO4 2- ≤500mg / L, reused as miscellaneous water, then chemically softened and precipitated, sludge dehydrated and transported for disposal, then filtered through multi-media filters and ultrafiltration, and three-stage concentration and desalination using low-pressure reverse osmosis, medium-pressure reverse osmosis, and high-pressure reverse osmosis, thereby reducing the COD in the sewage Cr 、BOD5、SS、TDS、TH、Cl - 、SO4 2- The value of purified COD is much higher than the HG / T 3923-2007 circulating cooling water recycled water quality standard requirements Cr ≤80mg / L, BOD5≤5mg / L, SS≤20mg / L, TDS≤1000mg / L, TH≤500mg / L, Cl - For recycled water with a concentration of ≤500mg / L, the final high-pressure reverse osmosis concentrated water is evaporated and crystallized to produce mixed salt for external disposal; considering different reuse occasions and purposes, the miscellaneous water produced by the aerated biological filter can also be blended with the produced water of the reverse osmosis system and then reused; achieving the purpose of resource utilization of qualified sewage and zero liquid discharge treatment.

[0004] The technical solution of the present invention is as follows: a device for recycling qualified sewage and treating zero liquid discharge, comprising a pre-stage pretreatment system, a low-pressure reverse osmosis system, a concentrated water pretreatment system, and a concentrated evaporation system; wherein the qualified sewage is connected to the water inlet of the pre-stage pretreatment system, the miscellaneous water outlet of the pre-stage pretreatment system sends out the miscellaneous water, the sludge outlet of the pre-stage pretreatment system sends out the pre-stage pretreatment mud cake for external transportation and disposal, and the water outlet of the pre-stage pretreatment system sends out the pre-stage pretreatment system effluent to the 1# water inlet of the low-pressure reverse osmosis system; the recycled water outlet of the low-pressure reverse osmosis system sends out the recycled water, and the concentrated water outlet of the low-pressure reverse osmosis system sends out the low-pressure reverse osmosis concentrated water to the water inlet of the concentrated water pretreatment system; the sludge outlet of the concentrated water pretreatment system sends out the concentrated water pretreatment mud cake for external transportation and disposal, and the water outlet of the concentrated water pretreatment system sends out the concentrated water pretreatment system effluent to the liquid inlet of the concentrated evaporation system; the water outlet of the concentrated evaporation system sends out the produced water of the concentrated evaporation system to the 2# water inlet of the low-pressure reverse osmosis system, and the salt outlet of the concentrated evaporation system sends out the crystallized salt for external transportation and disposal.

[0005] The pre-stage pretreatment system comprises a regulating tank, an aerated biological filter, an intermediate water tank, a crystallization and hardness removal device, a pre-stage pretreatment sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device, a pre-stage pretreatment backwash water collection tank, a pre-stage pretreatment sludge concentration tank, a pre-stage pretreatment horizontal screw centrifuge, a clear water tank, a pre-stage pretreatment multi-media filter, an ultrafiltration device, an ultrafiltration water production tank, an aeration fan, an aerated biological filter backwash fan, a pre-stage pretreatment multi-media filter backwash fan, an ultrafiltration backwash fan, a qualified sewage lifting pump, an aerated biological filter backwash pump, a miscellaneous water delivery pump, a hardness removal lifting pump, a pre-stage pretreatment backwash water lifting pump, a pre-stage pretreatment sludge discharge pump Pump, pre-stage pretreatment sludge feed pump, pre-stage pretreatment filter pump, pre-stage pretreatment multi-media filter backwash pump, ultrafiltration backwash pump, low-pressure reverse osmosis booster pump; the qualified sewage is connected to the water inlet of the regulating tank, the outlet of the regulating tank is connected to the water inlet of the aerated biological filter through the qualified sewage lifting pump, the air outlet of the aeration fan is connected to the aeration air inlet of the aerated biological filter, the air outlet of the aeration filter backwash fan is connected to the backwash air inlet of the aerated biological filter, and the water outlet of the aerated biological filter is connected to the water inlet of the intermediate water tank; the 1# outlet of the intermediate water tank is connected to the backwash water inlet of the aerated biological filter through the aerated biological filter backwash pump, and the The backwash water outlet is connected to the 1# water inlet of the pre-stage pretreatment backwash water collection tank, the 2# water outlet of the intermediate water tank sends out the miscellaneous water through the miscellaneous water delivery pump, and the 3# water outlet of the intermediate water tank is connected to the 1# water inlet of the crystallization and hardness removal device through the hardness removal lifting pump; the drug outlet of the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device of the pre-stage pretreatment is connected to the drug inlet of the crystallization and hardness removal device, the mud discharge port of the crystallization and hardness removal device is connected to the mud inlet of the pre-stage pretreatment sludge thickening tank through the pre-stage pretreatment mud discharge pump, the mud outlet of the pre-stage pretreatment sludge thickening tank is connected to the mud inlet of the pre-stage pretreatment horizontal screw centrifuge through the pre-stage pretreatment sludge feed pump, and the pre-stage pretreatment horizontal screw centrifuge is connected to the mud inlet of the pre-stage pretreatment horizontal screw centrifuge. The mud outlet of the machine sends out the pre-stage pretreatment mud cake for external transportation and disposal, the water outlet of the pre-stage pretreatment horizontal screw centrifuge is connected to the 2# water inlet of the crystallization and hardness removal device, and the water outlet of the crystallization and hardness removal device is connected to the water inlet of the clear water tank; the 1# water outlet of the clear water tank is connected to the water inlet of the pre-stage pretreatment multi-media filter through the pre-stage pretreatment filter pump; the 2# water outlet of the clear water tank is connected to the backwash water inlet of the pre-stage pretreatment multi-media filter through the pre-stage pretreatment multi-media filter backwash pump, the air outlet of the pre-stage pretreatment multi-media filter backwash fan is connected to the backwash air inlet of the pre-stage pretreatment multi-media filter, and the water outlet of the pre-stage pretreatment multi-media filter is connected to the water inlet of the ultrafiltration device;The air outlet of the ultrafiltration backwash fan is connected to the backwash air inlet of the ultrafiltration device, the backwash water outlets of the pre-stage pretreatment multi-media filter and the ultrafiltration device are connected to the 2# water inlet of the pre-stage pretreatment backwash water collection tank, the water outlet of the pre-stage pretreatment backwash water collection tank is connected to the 3# water inlet of the crystallization and hardness removal device through the pre-stage pretreatment backwash water booster pump, the water outlet of the ultrafiltration device is connected to the water inlet of the ultrafiltration water production tank, the 1# water outlet of the ultrafiltration water production tank is connected to the backwash water inlet of the ultrafiltration device through the ultrafiltration backwash pump, and the 2# water outlet of the ultrafiltration water production tank sends the pre-stage pretreatment system water out through the low-pressure reverse osmosis booster pump. ;

[0006] The low-pressure reverse osmosis system comprises a low-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a low-pressure reverse osmosis security filter, a low-pressure reverse osmosis device, a low-pressure reverse osmosis concentrated water tank, a recycled water tank, a low-pressure reverse osmosis high-pressure pump, a low-pressure reverse osmosis concentrated water delivery pump, and a recycled water delivery pump; wherein the water outlet of the pre-stage pretreatment system is connected to the water inlet of the low-pressure reverse osmosis security filter, the drug outlet of the low-pressure reverse osmosis scale inhibitor and reducing agent dosing device is also connected to the water inlet of the low-pressure reverse osmosis security filter, and the low-pressure reverse The water outlet of the osmosis security filter is connected to the water inlet of the low-pressure reverse osmosis device through a low-pressure reverse osmosis high-pressure pump, the water output of the low-pressure reverse osmosis device is connected to the 1# water inlet of the reuse water tank, the water output of the concentration and evaporation system is connected to the 2# water inlet of the reuse water tank, the water outlet of the reuse water tank is delivered to the reuse water through the reuse water delivery pump, the concentrate water outlet of the low-pressure reverse osmosis device is connected to the water inlet of the low-pressure reverse osmosis concentrate water tank, and the water outlet of the low-pressure reverse osmosis concentrate water tank delivers low-pressure reverse osmosis concentrate water through the low-pressure reverse osmosis concentrate water delivery pump.

[0007] The concentrated water pretreatment system comprises a hardness and silicon removal device, a sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for concentrated water pretreatment, a concentrated water pretreatment sludge concentration tank, a concentrated water pretreatment horizontal screw centrifuge, an ozone contact oxidation tank, an ozone generating device, an oxidation water tank, a concentrated water pretreatment multi-media filter, a softening bed, a resin regeneration device, a tubular ultrafiltration device, a concentrated water pretreatment system outlet tank, a concentrated water pretreatment backwash water collection tank, a concentrated water pretreatment multi-media filter backwash fan, a concentrated water pretreatment sludge pump, a concentrated water pretreatment sludge feed pump, a concentrated water pretreatment filter pump, a concentrated water pretreatment multi-media filter backwash pump, a tubular ultrafiltration backwash pump, a concentrated water pretreatment outlet water delivery pump, and a concentrated water Pretreatment backwash water lifting pump; wherein the low-pressure reverse osmosis concentrated water is connected to the 1# water inlet of the hardness and silicon removal device, the drug outlet of the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device of the concentrated water pretreatment is connected to the drug inlet of the hardness and silicon removal device, the mud discharge port of the hardness and silicon removal device is connected to the mud inlet of the concentrated water pretreatment sludge thickening tank through the concentrated water pretreatment mud discharge pump, the mud outlet of the concentrated water pretreatment sludge thickening tank is connected to the mud inlet of the concentrated water pretreatment horizontal screw centrifuge through the concentrated water pretreatment sludge feed pump, the concentrated water pretreatment mud cake is sent out from the mud outlet of the concentrated water pretreatment horizontal screw centrifuge, the water outlet of the concentrated water pretreatment horizontal screw centrifuge is connected to the 2# water inlet of the hardness and silicon removal device, and the water outlet of the hardness and silicon removal device is connected to the ozone connection The water inlet of the contact oxidation tank and the ozone outlet of the ozone generator are connected to the air inlet of the ozone contact oxidation tank, and the water outlet of the ozone contact oxidation tank is connected to the water inlet of the oxidation water tank; the 1# water outlet of the oxidation water tank is connected to the water inlet of the concentrated water pretreatment multi-media filter through the concentrated water pretreatment filter pump, the 2# water outlet of the oxidation water tank is connected to the backwash water inlet of the concentrated water pretreatment multi-media filter through the concentrated water pretreatment multi-media filter backwash pump, the air outlet of the concentrated water pretreatment multi-media filter backwash fan is connected to the backwash air inlet of the concentrated water pretreatment multi-media filter, the water outlet of the concentrated water pretreatment multi-media filter is connected to the water inlet of the softening bed, and the drug outlet of the resin regeneration device is connected to the regeneration liquid inlet of the softening bed. The outlet of the softening bed is connected to the water inlet of the tubular ultrafiltration device; the outlet of the tubular ultrafiltration device is connected to the water inlet of the concentrated water pretreatment system outlet pool, the 1# outlet of the concentrated water pretreatment system outlet pool sends out the concentrated water pretreatment system outlet water through the concentrated water pretreatment outlet water delivery pump, and the 2# outlet of the concentrated water pretreatment system outlet pool is connected to the backwash water inlet of the tubular ultrafiltration device through the tubular ultrafiltration backwash pump; the backwash water outlet of the concentrated water pretreatment multi-media filter and the tubular ultrafiltration device, and the regeneration liquid outlet of the softening bed are all connected to the water inlet of the concentrated water pretreatment backwash water collecting pool, and the outlet of the concentrated water pretreatment backwash water collecting pool is connected to the 3# water inlet of the hardness and silicon removal device through the concentrated water pretreatment backwash water lifting pump.

[0008] The structure of the concentrated evaporation system includes a medium-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a medium-pressure reverse osmosis security filter, a medium-pressure reverse osmosis device, a medium-pressure reverse osmosis concentrated water tank, a high-pressure reverse osmosis scale inhibitor dosing device, a high-pressure reverse osmosis security filter, a high-pressure reverse osmosis device, a high-pressure reverse osmosis concentrated water tank, an evaporation crystallization device, a medium-pressure reverse osmosis high-pressure pump, a high-pressure reverse osmosis booster pump, a high-pressure reverse osmosis high-pressure plunger pump, and a high-pressure reverse osmosis concentrated water delivery pump; wherein the water outlet of the concentrated water pretreatment system is connected to the water inlet of the medium-pressure reverse osmosis security filter, the drug outlet of the medium-pressure reverse osmosis scale inhibitor and reducing agent dosing device is also connected to the water inlet of the medium-pressure reverse osmosis security filter, the water outlet of the medium-pressure reverse osmosis security filter is connected to the water inlet of the medium-pressure reverse osmosis device through the medium-pressure reverse osmosis high-pressure pump, and the concentrated water of the medium-pressure reverse osmosis device The water inlet is connected to the water inlet of the medium-pressure reverse osmosis concentrated water tank, and the water outlet of the medium-pressure reverse osmosis concentrated water tank is connected to the water inlet of the high-pressure reverse osmosis security filter through a high-pressure reverse osmosis booster pump; the drug outlet of the high-pressure reverse osmosis antiscalant dosing device is also connected to the water inlet of the high-pressure reverse osmosis security filter, and the water outlet of the high-pressure reverse osmosis security filter is connected to the water inlet of the high-pressure reverse osmosis device through a high-pressure reverse osmosis high-pressure plunger pump, the concentrated water inlet of the high-pressure reverse osmosis device is connected to the water inlet of the high-pressure reverse osmosis concentrated water tank, and the water outlet of the high-pressure reverse osmosis concentrated water tank is connected to the liquid inlet of the evaporation crystallization device through a high-pressure reverse osmosis concentrated water delivery pump, and the salt outlet of the evaporation crystallization device delivers crystallized salt, and the water production inlet of the medium-pressure reverse osmosis device and the water production inlet of the high-pressure reverse osmosis device are combined with the condensed water outlet of the evaporation crystallization device to deliver the concentrated evaporation system water.

[0009] The characteristics of the present invention are as follows: the device and method for treating wastewater with qualified standards and zero liquid discharge firstly treats the wastewater with qualified standards to COD by using a pre-treatment system and aeration biological filter. Cr ≤40mg / L, BOD5≤5mg / L, and get miscellaneous water, and then treat the sewage to the total hardness ≤50mg / L, suspended solids ≤1mg / L; secondly, the pre-treatment effluent is primary concentrated and desalted through the low-pressure reverse osmosis system; and then the low-pressure reverse osmosis concentrated water is treated to the total hardness ≤5mg / L, COD Cr ≤10mg / L, SiO2≤5mg / L, SS≤1mg / L; finally, through the concentration and evaporation system, medium-pressure reverse osmosis and high-pressure reverse osmosis are used in turn for concentration and reduction, and MVR is used to evaporate the mixed salt and purify the recycled water with TDS≤300mg / L; thereby achieving the purpose of standard sewage resource utilization and zero liquid discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 The overall structural block diagram of the wastewater resource utilization and liquid zero discharge treatment device that meets the standards.

[0011] In the attached figure, PTS1 represents the pre-stage pretreatment system, LROS represents the low-pressure reverse osmosis system, PTS2 represents the concentrate pretreatment system, CVS represents the concentration evaporation system, IAWW represents the qualified sewage, ST represents the crystallized salt, SC1 represents the pre-stage pretreatment mud cake, SC2 represents the concentrate pretreatment mud cake, RCW1 represents the miscellaneous water, RCW2 represents the recycled water, PTO1 represents the effluent of the pre-stage pretreatment system, PTO2 represents the effluent of the concentrate pretreatment system, LCW represents the low-pressure reverse osmosis concentrate, and CPW represents the produced water of the concentration evaporation system.

[0012] Attached Figure 2 Structural block diagram of the pre-treatment system of the wastewater resource utilization and liquid zero discharge treatment device that meets the standards.

[0013] In the figure, PTS1 indicates the pre-treatment system, IAWW indicates the qualified sewage, RCW1 indicates the miscellaneous water, SC1 indicates the pre-treatment mud cake, PTO1 indicates the effluent of the pre-treatment system, WT 11 represents regulating tank, BAF represents biological aerated filter, WT represents 12 represents the intermediate water tank, CDH represents the crystallization and hardness removal device, D 11 Indicates the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for the pre-treatment, WT 15 Indicates the pre-treatment backwash water collection tank, WT 16 Indicates the pre-treatment sludge thickening tank, HCM 11 Indicates the pre-treatment horizontal screw centrifuge, WT 13 Represents clear pool, MMF 11 It stands for pre-treatment multi-media filter, UF stands for ultrafiltration device, WT stands for 14 represents the ultrafiltration water production pool, B 11 Indicates aeration fan, B 12 Indicates the backwash fan of the aerated biological filter, B 13 Indicates the backwash fan of the pre-treatment multi-media filter, B 14 Indicates ultrafiltration backwash fan, P 11 Indicates standard sewage lifting pump, P 12 Indicates the backwash pump of the aerated biological filter, P 13 Indicates miscellaneous water delivery pump, P 14 Indicates the hard lift pump, P 15 Indicates the pre-treatment backwash water boost pump, P 16 Indicates the pre-treatment sludge pump, P 17 Indicates the pre-treatment sludge feed pump, P 18 Indicates the pre-treatment filter pump, P 19 Indicates the backwash pump of the pre-treatment multi-media filter, P 110 Indicates ultrafiltration backwash pump, P 111Indicates low pressure reverse osmosis booster pump. Figure 3 Structural block diagram of the low-pressure reverse osmosis system of the wastewater resource utilization and liquid zero discharge treatment device that meets the standards.

[0014] LROS in the figure indicates low pressure reverse osmosis system, PTO1 indicates the treated water from the pre-stage pre-system, LCW indicates low pressure reverse osmosis concentrated water, RCW2 indicates recycled water, CPW indicates the produced water from the concentrated evaporation system, D 21 Represents low pressure reverse osmosis scale inhibitor and reducing agent dosing device, SAF 21 Indicates low pressure reverse osmosis security filter, LRO indicates low pressure reverse osmosis device, WT 21 Indicates low pressure reverse osmosis concentrated water tank, WT 22 Represents the recycled water tank, P 21 Represents low pressure reverse osmosis high pressure pump, P 22 Indicates low-pressure reverse osmosis concentrated water delivery pump, P 23 Indicates recycled water delivery pump.

[0015] Attached Figure 4 Structural block diagram of the concentrate pretreatment system of the wastewater resource utilization and liquid zero discharge treatment device that meets the standards.

[0016] In the figure, PTS2 represents the concentrate pretreatment system, LCW represents low-pressure reverse osmosis concentrate, PTO2 represents the effluent from the concentrate pretreatment system, SC2 represents the concentrate pretreatment mud cake, DHSI represents the hardness and silicon removal device, and D 31 Indicates the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for concentrated water pretreatment, WT 31 HCM stands for concentrated water pretreatment sludge thickening tank. 31 stands for concentrated water pretreatment horizontal screw centrifuge, O3CT stands for ozone contact oxidation tank, O3G stands for ozone generator, WT 32 Indicates oxidation pool, MMF 31 represents concentrated water pretreatment multi-media filter, CB represents softening bed, D 32 Resin regeneration device, TUF tubular ultrafiltration device, WT 33 Indicates the outlet pool of the concentrated water pretreatment system, WT 34 Indicates concentrated water pretreatment backwash water collection tank, B 31 Indicates the backwash fan of the concentrated water pretreatment multi-media filter, P 31 Indicates concentrated water pretreatment sludge pump, P 32 Indicates the concentrated water pretreatment sludge feed pump, P 33 Indicates concentrated water pretreatment filter pump, P 34 Indicates the backwash pump of the concentrated water pretreatment multi-media filter, P 35 Indicates tubular ultrafiltration backwash pump, P 36 Indicates the outlet water delivery pump of the concentrated water pretreatment system, P37 Indicates the concentrate pretreatment backwash water lift pump.

[0017] Attached Figure 5 Concentration and evaporation system of wastewater resource utilization and liquid zero discharge treatment device that meets the standards.

[0018] In the attached figure, CVS indicates the concentrated evaporation system, PTO2 indicates the effluent from the concentrated water pretreatment system, ST indicates the crystallized salt, CPW indicates the produced water from the concentrated evaporation system, and D 41 Represents medium pressure reverse osmosis scale inhibitor and reducing agent dosing device, SAF 41 Represents medium pressure reverse osmosis security filter, MRO represents medium pressure reverse osmosis unit, WT 41 Indicates medium pressure reverse osmosis concentrated water tank, D 42 It means high pressure reverse osmosis antiscalant dosing device, SAF 42 It stands for high pressure reverse osmosis security filter, HRO stands for high pressure reverse osmosis device, WT 42 It stands for high pressure reverse osmosis concentrated water tank, MVR stands for evaporation crystallization device, P 41 Indicates medium pressure reverse osmosis high pressure pump, P 42 Indicates high pressure reverse osmosis booster pump, P 43 Represents high pressure reverse osmosis high pressure plunger pump, P 44 Indicates high-pressure reverse osmosis concentrated water delivery pump.

[0019] Attached Figure 6 Water balance diagram of an implementation example of a wastewater resource utilization and liquid zero discharge treatment device that meets standards. DETAILED DESCRIPTION

[0020] Compare with Figure 1, a qualified sewage resource utilization and liquid zero discharge treatment device, whose structure includes a pre-stage pretreatment system PTS1, a low-pressure reverse osmosis system LROS, a concentrated water pretreatment system PTS2, and a concentrated evaporation system CVS; wherein the qualified sewage IAWW is connected to the water inlet of the pre-stage pretreatment system PTS1, the miscellaneous water outlet of the pre-stage pretreatment system PTS1 sends out miscellaneous water RCW1, the sludge outlet of the pre-stage pretreatment system PTS1 sends out the pre-stage pretreatment mud cake SC1 for external transportation and disposal, and the water outlet of the pre-stage pretreatment system PTS1 sends the pre-stage pretreatment system outlet water PTO1 to the 1# water inlet of the low-pressure reverse osmosis system LROS; the recycled water outlet of the low-pressure reverse osmosis system LROS sends out the recycled water RCW2, and the low-pressure reverse osmosis system LROS The concentrate outlet sends low-pressure reverse osmosis concentrate LCW to the water inlet of the concentrate pretreatment system PTS2; the sludge outlet of the concentrate pretreatment system PTS2 sends the concentrate pretreatment mud cake SC2 for external transportation and disposal, and the outlet of the concentrate pretreatment system PTS2 sends the concentrate pretreatment system output water PTO2 to the liquid inlet of the concentration and evaporation system CVS; the outlet of the concentration and evaporation system CVS sends the concentrated evaporation system produced water CPW to the 2# water inlet of the low-pressure reverse osmosis system LROS, and the salt outlet of the concentration and evaporation system CVS sends the crystallized salt ST for external transportation and disposal.

[0021] Compare with Figure 2 , the pre-treatment system PTS1, its structure includes a regulating tank WT 11 , biological aerated filter BAF, intermediate water tank WT 12 , Crystallization and hardness removal device CDH, pre-treatment of sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device D 11 , Pre-treatment backwash water collection tank WT 15 , Pre-treatment sludge thickening tank WT 16 , Pre-treatment Horizontal Screw Centrifuge HCM 11 , clear pool WT 13 , pre-treatment multi-media filter MMF 11 , ultrafiltration device UF, ultrafiltration water production pool WT 14 、Aeration fan B 11 、Aerated biological filter backwash fan B 12 , Pre-treatment Multi-media Filter Backwash Fan B 13 、Ultrafiltration backwash fan B 14 , Standard sewage lifting pump P 11 , Aerated biological filter backwash pump P 12 , Miscellaneous water delivery pump P 13 , Hardness Removal Lifting Pump P 14 , Pre-stage pre-treatment backwash water lift pump P 15 , Pre-treatment sludge pump P 16 , Pre-stage pretreatment sludge feed pump P 17, Pre-treatment filter pump P 18 , Pre-treatment Multi-media Filter Backwash Pump P 19 ,Ultrafiltration backwash pump P 110 , low pressure reverse osmosis booster pump P 111 ; The qualified sewage IAWW is connected to the regulating tank WT 11 Water inlet, regulating tank WT 11 The outlet of the sewage pump P 11 Connected to the water inlet of the biological aerated filter BAF, aeration fan B 11 The air outlet is connected to the aeration inlet of the aerated biological filter BAF, and the backwash fan B of the aerated biological filter 12 The air outlet is connected to the backwash air inlet of the aerated biological filter BAF, and the water outlet of the aerated biological filter BAF is connected to the intermediate water tank WT 12 Water inlet; intermediate water tank WT 12 The 1# outlet of the aerated biological filter backwash pump P 12 Connected to the backwash water inlet of the aerated biological filter BAF, and the backwash water outlet of the aerated biological filter BAF is connected to the pre-treatment backwash water collection tank WT 15 1# water inlet, middle water tank WT 12 The 2# water outlet is connected to the miscellaneous water delivery pump P 13 Send out miscellaneous water RCW1, intermediate water tank WT 12 The 3# outlet of the pump is pumped by the hardness removal pump P 14 Connected to the 1# water inlet of the crystallization and hardness removal device CDH; the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device D for the pre-treatment 11 The drug outlet is connected to the drug inlet of the crystallization and hardness removal device CDH, and the mud discharge port of the crystallization and hardness removal device CDH is connected to the pre-stage pretreatment mud discharge pump P 16 With the previous stage pretreatment sludge thickening tank WT 16 The mud inlet is connected to the front stage pretreatment sludge thickening tank WT 16 The mud outlet is fed by the pre-treatment sludge feed pump P 17 HCM 11 The mud inlet is connected to the front stage pretreatment horizontal screw centrifuge HCM 11 The mud outlet sends out the pre-treatment mud cake SC1 for external disposal, and the pre-treatment horizontal screw centrifuge HCM 11 The outlet of the crystallization and hardness removal device CDH is connected to the 2# water inlet, and the outlet of the crystallization and hardness removal device CDH is connected to the clear water tank WT 13 Water inlet; clear water tank WT 13 The 1# outlet of the filter pump P 18 Multi-media filter MMF with pre-treatment 11The water inlet is connected to the clean water tank WT 13 The 2# outlet of the pre-treatment multi-media filter backwash pump P 19 Multi-media filter MMF with pre-treatment 11 The backwash water inlet is connected to the front stage pretreatment multi-media filter backwash fan B 13 The air outlet is connected to the pre-treatment multi-media filter MMF 11 Backwash air inlet, pre-treatment multi-media filter MMF 11 The water outlet is connected to the water inlet of the ultrafiltration device UF; the ultrafiltration backwash fan B 14 The air outlet is connected to the backwash air inlet of the ultrafiltration device UF, and the pre-stage pretreatment multi-media filter MMF 11 The backwash water outlet of the ultrafiltration device UF is connected to the pre-treatment backwash water collection tank WT 15 2# water inlet, pre-treatment backwash water collection tank WT 15 The outlet of the water passes through the front stage pretreatment backwash water lifting pump P 15 Connect to the 3# water inlet of the crystallization and hardness removal device CDH, and the outlet of the ultrafiltration device UF is connected to the ultrafiltration water production pool WT 14 The water inlet, ultrafiltration water production pool WT 14 The 1# outlet of the ultrafiltration backwash pump P 110 Connected to the backwash water inlet of the ultrafiltration device UF, the ultrafiltration water production pool WT 14 The 2# outlet of the low pressure reverse osmosis booster pump P 111 Send the water out of the pre-treatment system to PTO1.

[0022] Compare with Figure 3 , low pressure reverse osmosis system LROS, its structure includes low pressure reverse osmosis antiscalant and reducing agent dosing device D 21 , low pressure reverse osmosis security filter SAF 21 , low pressure reverse osmosis device LRO, low pressure reverse osmosis concentrated water tank WT 21 , Recycled water tank WT 22 , low pressure reverse osmosis high pressure pump P 21 , low pressure reverse osmosis concentrated water delivery pump P 22 , Recycled water delivery pump P 23 ; The water outlet PTO1 of the pre-treatment system is connected to the low-pressure reverse osmosis security filter SAF 21 Water inlet, low pressure reverse osmosis antiscalant and reducing agent dosing device D 21 The drug outlet is also connected to the low-pressure reverse osmosis security filter SAF 21 Water inlet, low pressure reverse osmosis security filter SAF 21 The outlet of the water passes through the low pressure reverse osmosis high pressure pump P 21Connect to the water inlet of the low-pressure reverse osmosis device LRO, and the water outlet of the low-pressure reverse osmosis device LRO is connected to the recycled water tank WT 22 The 1# water inlet of the concentrated evaporation system is connected to the recycled water tank WT. 22 2# water inlet, recycling water tank WT 22 The outlet of the water is pumped through the recycled water pump P 23 Send out recycled water RCW2, and connect the concentrate outlet of the low-pressure reverse osmosis device LRO to the low-pressure reverse osmosis concentrate tank WT 21 Water inlet, low pressure reverse osmosis concentrated water tank WT 21 The outlet of the water is delivered by a low-pressure reverse osmosis concentrated water delivery pump P 22 Deliver low-pressure reverse osmosis concentrated water LCW.

[0023] Compare with Figure 4 , concentrated water pretreatment system PTS2, its structure includes hardness and silicon removal device DHSI, concentrated water pretreatment sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device D 31 , concentrated water pretreatment sludge thickening tank WT 31 , Concentrate pretreatment horizontal screw centrifuge HCM 31 , Ozone contact oxidation tank O3CT, ozone generator O3G, oxidation water tank WT 32 , Concentrated water pretreatment multi-media filter MMF 31 , softening bed CB, resin regeneration device D 32 , Tubular ultrafiltration device TUF, Concentrated water pretreatment system outlet pool WT 33 , concentrated water pretreatment backwash water collection tank WT 34 , Concentrated water pretreatment multi-media filter backwash fan B 31 , Concentrated water pretreatment sludge pump P 31 , Concentrated water pretreatment sludge feed pump P 32 , Concentrated water pretreatment filter pump P 33 , Concentrated water pretreatment multi-media filter backwash pump P 34 , Tubular ultrafiltration backwash pump P 35 , Concentrated water pretreatment effluent delivery pump P 36 , Concentrated water pretreatment backwash water booster pump P 37 The low-pressure reverse osmosis concentrated water LCW is connected to the 1# water inlet of the hardness and silicon removal device DHSI, and the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device D for concentrated water pretreatment 31 The drug outlet is connected to the drug inlet of the hardness and silicon removal device DHSI, and the mud outlet of the hardness and silicon removal device DHSI is connected to the concentrated water pretreatment mud pump P 31 WT with concentrated water pretreatment sludge thickening tank 31 The sludge inlet is connected to the concentrated water pretreatment sludge thickening tank WT 31The mud outlet is fed by the concentrated water pre-treated sludge feed pump P 32 HCM decanter centrifuge with concentrate pretreatment 31 The mud inlet is connected to the concentrated water pretreatment horizontal screw centrifuge HCM 31 The mud outlet sends out the concentrated water pretreatment mud cake SC2, concentrated water pretreatment horizontal screw centrifuge HCM 31 The outlet of the DHSI is connected to the 2# water inlet of the hardness and silicon removal device DHSI, the outlet of the DHSI is connected to the water inlet of the ozone contact oxidation tank O3CT, the ozone outlet of the ozone generator O3G is connected to the air inlet of the ozone contact oxidation tank O3CT, and the outlet of the ozone contact oxidation tank O3CT is connected to the oxidation tank WT. 32 Water inlet; oxidation pool WT 32 The 1# outlet of the concentrated water pretreatment filter pump P 33 Multi-media filter MMF for concentrated water pretreatment 31 The water inlet is connected to the oxidation pool WT 32 The 2# outlet of the concentrated water pretreatment multi-media filter backwash pump P 34 Multi-media filter MMF for concentrated water pretreatment 31 The backwash water inlet is connected to the concentrated water pretreatment multi-media filter backwash fan B 31 The air outlet is connected to the concentrated water pretreatment multi-media filter MMF 31 Backwash air inlet, concentrated water pretreatment multi-media filter MMF 31 The outlet of the softening bed CB is connected to the water inlet, and the resin regeneration device D 32 The outlet of the softening bed CB is connected to the regeneration liquid inlet of the softening bed CB, and the outlet of the softening bed CB is connected to the water inlet of the tubular ultrafiltration device TUF; the outlet of the tubular ultrafiltration device TUF is connected to the concentrated water pretreatment system outlet pool WT 33 The water inlet, concentrated water pretreatment system outlet pool WT 33 The 1# outlet of the pump is pumped through the concentrated water pretreatment outlet pump P 36 Send out the concentrated water pretreatment system effluent PTO2, concentrated water pretreatment system effluent pool WT 33 The 2# water outlet is connected to the tubular ultrafiltration backwash pump P 35 Connected to the backwash water inlet of the tubular ultrafiltration device TUF; concentrated water pretreatment multi-media filter MMF 31 The backwash water outlet of the tubular ultrafiltration device TUF and the regeneration liquid outlet of the softening bed CB are connected to the concentrated water pretreatment backwash water collection tank WT 34 Inlet, concentrated water pretreatment backwash water collection tank WT 34 The outlet of the backwash water is pumped by the concentrated water pretreatment pump P 37 Connect to the 3# water inlet of the hardness and silicon removal device DHSI.

[0024] Compare with Figure 5 , Concentration and evaporation system CVS, its structure includes medium pressure reverse osmosis scale inhibitor and reducing agent dosing device D 41 , Medium pressure reverse osmosis security filter SAF 41 , medium pressure reverse osmosis unit MRO, medium pressure reverse osmosis concentrated water tank WT 41 , High-pressure reverse osmosis antiscalant dosing device D 42 , high pressure reverse osmosis security filter SAF 42 , high pressure reverse osmosis device HRO, high pressure reverse osmosis concentrated water tank WT 42 , evaporation crystallization device MVR, medium pressure reverse osmosis high pressure pump P 41 , High pressure reverse osmosis booster pump P 42 , High pressure reverse osmosis high pressure plunger pump P 43 , High-pressure reverse osmosis concentrated water delivery pump P 44 ; The concentrated water pretreatment system outlet water PTO2 is connected to the medium pressure reverse osmosis security filter SAF 41 Water inlet, medium pressure reverse osmosis antiscalant and reducing agent dosing device D 41 The drug outlet is also connected to the medium pressure reverse osmosis safety filter SAF 41 Water inlet, medium pressure reverse osmosis security filter SAF 41 The outlet of the water passes through the medium pressure reverse osmosis high pressure pump P 41 Connected to the water inlet of the medium pressure reverse osmosis device MRO, and the concentrated water outlet of the medium pressure reverse osmosis device MRO is connected to the medium pressure reverse osmosis concentrated water tank WT 41 Water inlet, medium pressure reverse osmosis concentrated water tank WT 41 The outlet of the water passes through the high pressure reverse osmosis booster pump P 42 With high pressure reverse osmosis security filter SAF 42 The water inlet is connected; High-pressure reverse osmosis antiscalant dosing device D 42 The drug outlet is also connected to the high pressure reverse osmosis safety filter SAF 42 Water inlet, high pressure reverse osmosis security filter SAF 42 The water outlet is pumped through a high pressure reverse osmosis high pressure plunger pump P 43 Connected to the water inlet of the high pressure reverse osmosis device HRO, and the concentrated water outlet of the high pressure reverse osmosis device HRO is connected to the high pressure reverse osmosis concentrated water tank WT 42 Water inlet, high pressure reverse osmosis concentrated water tank WT 42 The outlet of the water is delivered by a high-pressure reverse osmosis concentrated water delivery pump P 44 It is connected to the liquid inlet of the evaporation crystallization device MVR, and the salt outlet of the evaporation crystallization device MVR sends out the crystallized salt ST. The water outlet of the medium pressure reverse osmosis device MRO and the water outlet of the high pressure reverse osmosis device HRO merge with the condensed water outlet of the evaporation crystallization device MVR to send out the concentrated evaporation system water CPW.

[0025] The working method of the standard sewage resource utilization and liquid zero discharge treatment device includes the following steps:

[0026] 1) Through the pre-treatment system, the qualified sewage is treated to COD≤40mg / L and BOD≤5mg / L by using the aerated biological filter to obtain miscellaneous water, and then the sewage is treated to TH≤50mg / L and SS≤1mg / L;

[0027] 2) The pre-treatment effluent is initially concentrated and desalinated through a low-pressure reverse osmosis system;

[0028] 3) Through the concentrated water pretreatment system, the low-pressure reverse osmosis concentrated water is treated to TH≤5mg / L, COD≤10mg / L, SiO2≤5mg / L, SS≤1mg / L;

[0029] 4) Through the concentration and evaporation system, medium-pressure reverse osmosis and high-pressure reverse osmosis are used in turn for concentration and reduction, and mixed salts are evaporated by MVR, and recycled water with TDS ≤ 300 mg / L is purified.

[0030] The pre-stage pretreatment system in step 1) includes a regulating tank, an aerated biological filter, an intermediate water tank, a crystallization and hardness removal device, a pre-stage pretreatment sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device, a pre-stage pretreatment backwash water collection tank, a pre-stage pretreatment sludge concentration tank, a pre-stage pretreatment horizontal screw centrifuge, a clear water tank, a pre-stage pretreatment multi-media filter, an ultrafiltration device, and an ultrafiltration water production tank; specifically for COD Cr : 50~100mg / L, BOD5: 10~20 mg / L, SS: 10~50mg / L, TDS: 1000~2000mg / L, TH≤500mg / L, Cl - ≤350mg / L, SO4 2- ≤500mg / L of standard sewage, use aerated biological filter to further reduce the COD of standard sewage Cr The sewage is treated to COD≤40mg / L and BOD≤5mg / L, meeting the BOD5≤10mg / L, TDS≤1000mg / L, and Cl value of GB / T 18920-2020 Urban sewage recycling and urban miscellaneous water quality requirements. - ≤350mg / L, SO4 2- ≤500mg / L, reused as miscellaneous water; then by adding sodium hydroxide, magnesium hydroxide, sodium carbonate, the sewage is treated to a hardness of ≤50mg / L and SS ≤1mg / L through a crystallization and hardness removal device, multi-media filtration, and ultrafiltration.

[0031] The low-pressure reverse osmosis system in step 2) includes a low-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a low-pressure reverse osmosis security filter, a low-pressure reverse osmosis device, a low-pressure reverse osmosis concentrated water tank, and a recycled water tank; specifically, for the pre-stage pre-treated effluent with a TDS of 1000-2000 mg / L, COD≤40 mg / L, hardness≤50 mg / L, and SS≤1 mg / L, a low-pressure reverse osmosis with a recovery rate of 67-87.5% is used to perform 3-8 times primary concentration and desalination to obtain low-pressure reverse osmosis concentrated water with a TDS of 6000-16000 mg / L, COD≤160 mg / L, hardness≤200 mg / L, and SS≤4 mg / L, and low-pressure reverse osmosis produced water with a TDS≤60 mg / L.

[0032] The concentrated water pretreatment system in step 3) includes a hardness and silicon removal device, a sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for concentrated water pretreatment, a concentrated water pretreatment sludge concentration tank, a concentrated water pretreatment horizontal screw centrifuge, an ozone contact oxidation tank, an ozone generating device, an oxidation water tank, a concentrated water pretreatment multi-media filter, a softening bed, a resin regeneration device, a tubular ultrafiltration device, a concentrated water pretreatment system outlet tank, and a concentrated water pretreatment backwash water collection tank; specifically, for low-pressure reverse osmosis concentrated water with a TDS of 6000-16000 mg / L, COD≤160 mg / L, hardness≤200 mg / L, and SS≤4 mg / L, sodium hydroxide, magnesium hydroxide, and sodium carbonate are added in sequence to remove hardness and silicon, ozone oxidation is used to reduce COD, resin softening, concentrated water pretreatment multi-media filter and tubular ultrafiltration are used to treat the low-pressure reverse osmosis concentrated water to a hardness of ≤ 5mg / L, COD≤10mg / L, SiO2≤5mg / L, SS≤1mg / L.

[0033] The concentration and evaporation system in the step 4) comprises a medium-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a medium-pressure reverse osmosis security filter, a medium-pressure reverse osmosis device, a medium-pressure reverse osmosis concentrated water tank, a high-pressure reverse osmosis scale inhibitor dosing device, a high-pressure reverse osmosis security filter, a high-pressure reverse osmosis device, a high-pressure reverse osmosis concentrated water tank, and an evaporation and crystallization device; specifically, for the concentrated water pretreatment system effluent with a TDS of 6000-16000 mg / L, hardness ≤5 mg / L, COD ≤10 mg / L, SiO2 ≤5 mg / L, and SS ≤1 mg / L, the medium-pressure reverse osmosis with a recovery rate of 67-80% is concentrated 3-5 times to obtain medium-pressure reverse osmosis concentrated water with a TDS of 18000-80000 mg / L and medium-pressure reverse osmosis produced water with a TDS ≤480 mg / L, and then the medium-pressure reverse osmosis concentrated water is concentrated 2-5 times using a high-pressure reverse osmosis with a recovery rate of 50-80% to obtain TDS The high-pressure reverse osmosis concentrated water with a TDS of 90,000 to 160,000 mg / L and the high-pressure reverse osmosis produced water with a TDS of ≤2000 mg / L are finally evaporated through MVR to produce mixed salt and evaporation crystallization condensed water with a TDS of ≤300 mg / L. The low-pressure reverse osmosis produced water with a TDS of ≤60 mg / L, the medium-pressure reverse osmosis produced water with a TDS of ≤480 mg / L, the high-pressure reverse osmosis produced water with a TDS of ≤2000 mg / L, and the evaporation crystallization condensed water with a TDS of ≤300 mg / L are mixed to form recycled water with a TDS of ≤300 mg / L, which is much higher than the COD required by the HG / T 3923-2007 recycled water quality standard for circulating cooling water. Cr ≤80mg / L, BOD5≤5mg / L, SS≤20mg / L, TDS≤1000mg / L, TH≤500mg / L, Cl - Recycled water quality ≤500mg / L.

[0034] Example

[0035] The 10,000T / D reclaimed water reuse project built in conjunction with a circular economy industrial park will be expanded to 20,000T / D in the long term.

[0036] 1. Design water quality and quantity

[0037] 1.1 Designed inlet water quality and quantity

[0038] The designed inlet water quality and quantity are as follows:

[0039] project Water volume <![CDATA[COD Cr ]]> <![CDATA[BOD5]]> SS Total hardness Cl- <![CDATA[SO4 2+ ]]> TDS unit T / D mg / L mg / L mg / L mg / L mg / L mg / L mg / L Numeric 10000 ≤100 ≤10 ≤200 ≤500 ≤350 ≤500 ≤1500

[0040] 1.2 Water quality and quantity of miscellaneous water and recycled water

[0041] The designed water quality and quantity of miscellaneous water and recycled water are as follows:

[0042] project Water volume <![CDATA[COD Cr ]]> <![CDATA[BOD5]]> SS Total hardness Cl- <![CDATA[SO4 2+ ]]> TDS unit T / D mg / L mg / L mg / L mg / L mg / L mg / L mg / L Miscellaneous water 5000 ≤40 ≤5 ≤10 ≤500 ≤350 ≤500 ≤1500 Recycled water 4963 ≤4 ≤1 ≤1 ≤50 ≤35 ≤50 ≤172

[0043] Note: In coastal areas and areas where the dissolved solids content in local water sources is high, the TDS requirement for miscellaneous water is ≤2000mg / L.

[0044] 2. Water balance and reverse osmosis concentration and purification effects at all levels

[0045] 2.1 Water balance

[0046] The water balance of the 10000T / D reclaimed water reuse project is attached. Figure 6 The water balance diagram of the embodiment of the standard sewage resource utilization and liquid zero discharge treatment device, in which 10000T / D of reclaimed water is treated, 5000T / D of general miscellaneous water with TDS of 1500mg / L is produced, 4963T / D of high-quality recycled water with TDS≤172mg / L is produced, and 37T / D of mud cake and miscellaneous salt are discharged.

[0047] 2.2 Reverse osmosis concentration and purification effect at each level

[0048] The purification effects of each level of reverse osmosis device are as follows:

[0049]

[0050]

[0051] 3. Main design parameters of the system

[0052] 3.1 Main civil engineering projects:

[0053] Serial number name Specification unit quantity Structural type 1 Comprehensive Building 34.2mX14.4mX13.9m seat 1 Three-layer light steel 2 Power distribution room and fan room 21.5mX18.0mX10.5m seat 1 Two-layer light steel 3 Phase I membrane treatment workshop 58.2mX28.2mX13.9m seat 1 Two-layer light steel 4 Phase I integrated pool 58.2mX10.8mX4.0~7.8m seat 1 Steel concrete lining FRP

[0054] 3.2 Main equipment:

[0055]

[0056]

[0057]

Claims

1. The working method of the standard sewage resource utilization and liquid zero discharge treatment device is characterized by The following steps are included: Cr :50~100mg / L、BOD5:10~20mg / L、SS:10~50mg / L、TDS:1000~2000mg / L、Total hardness ≤500mg / L、Cl - ≤350mg / L, SO4 2- ≤500mg / L of qualified sewage; 1) Through the pre-treatment system, the qualified sewage is treated to COD≤40mg / L and BOD≤5mg / L by using an aerated biological filter to obtain miscellaneous water, and then the sewage is treated to total hardness≤50mg / L and SS≤1mg / L; 2) The pre-treatment effluent is initially concentrated and desalinated through a low-pressure reverse osmosis system; 3) Through the concentrated water pretreatment system, the low-pressure reverse osmosis concentrated water is treated to a total hardness of ≤5mg / L, COD ≤10mg / L, SiO2 ≤5mg / L, SS ≤1mg / L; 4) Through the concentration and evaporation system, medium-pressure reverse osmosis and high-pressure reverse osmosis are used in sequence for concentration and reduction, and mixed salts are evaporated by MVR, and recycled water with TDS ≤ 300 mg / L is purified; The qualified sewage resource utilization and liquid zero discharge treatment device includes a pre-stage pretreatment system, a low-pressure reverse osmosis system, a concentrate pretreatment system, and a concentration evaporation system; wherein the qualified sewage is connected to the water inlet of the pre-stage pretreatment system, the miscellaneous water outlet of the pre-stage pretreatment system sends out miscellaneous water, the sludge outlet of the pre-stage pretreatment system sends out the pre-stage pretreatment mud cake for external transportation and disposal, and the water outlet of the pre-stage pretreatment system sends out the pre-stage pretreatment system outlet water to the 1# water inlet of the low-pressure reverse osmosis system; the recycled water outlet of the low-pressure reverse osmosis system sends out recycled water, and the concentrate outlet of the low-pressure reverse osmosis system sends low-pressure reverse osmosis concentrate to the water inlet of the concentrate pretreatment system; The sludge outlet of the concentrated water pretreatment system sends the concentrated water pretreatment mud cake for external transportation and disposal, and the water outlet of the concentrated water pretreatment system sends the concentrated water pretreatment system output water to the liquid inlet of the concentrated evaporation system; the water outlet of the concentrated evaporation system sends the concentrated evaporation system product water to the 2# water inlet of the low-pressure reverse osmosis system, and the salt outlet of the concentrated evaporation system sends the crystallized salt for external transportation and disposal; the pre-stage pretreatment system, its structure includes a regulating tank, an aerated biological filter, an intermediate water tank, a crystallization and hardness removal device, a pre-stage pretreatment sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device, a pre-stage pretreatment backwash water collection tank, a pre-stage pretreatment sludge concentration tank, a pre-stage pretreatment horizontal screw centrifuge, a clear water tank, a pre-stage pretreatment multi-media filter, an ultrafiltration device, an ultrafiltration water production tank, an aeration fan machine, aerated biological filter backwash fan, pre-stage pretreatment multi-media filter backwash fan, ultrafiltration backwash fan, qualified sewage lifting pump, aerated biological filter backwash pump, miscellaneous water delivery pump, hardness removal lifting pump, pre-stage pretreatment backwash water lifting pump, pre-stage pretreatment sludge pump, pre-stage pretreatment sludge feed pump, pre-stage pretreatment filter pump, pre-stage pretreatment multi-media filter backwash pump, ultrafiltration backwash pump, low-pressure reverse osmosis booster pump; the qualified sewage is connected to the water inlet of the regulating tank, the outlet of the regulating tank is connected to the water inlet of the aerated biological filter through the qualified sewage lifting pump, the outlet of the aeration fan is connected to the aeration inlet of the aerated biological filter, the outlet of the aerated biological filter backwash fan is connected to the backwash inlet of the aerated biological filter, and the outlet of the aerated biological filter The 1# outlet of the intermediate water tank is connected to the water inlet of the backwash water of the aerated biological filter through the backwash pump of the aerated biological filter, the backwash water outlet of the aerated biological filter is connected to the 1# inlet of the pre-stage pretreatment backwash water collection tank, the 2# outlet of the intermediate water tank is used to deliver miscellaneous water through the miscellaneous water delivery pump, the 3# outlet of the intermediate water tank is connected to the 1# inlet of the crystallization and hardness removal device through the hardness removal lifting pump; the drug outlet of the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device of the pre-stage pretreatment is connected to the drug inlet of the crystallization and hardness removal device, the sludge outlet of the crystallization and hardness removal device is connected to the sludge inlet of the pre-stage pretreatment sludge thickening tank through the pre-stage pretreatment sludge discharge pump, and the sludge outlet of the pre-stage pretreatment sludge thickening tank is connected to the sludge feed of the pre-stage pretreatment sludge. The pump is connected to the mud inlet of the pre-stage pretreatment horizontal screw centrifuge, the mud outlet of the pre-stage pretreatment horizontal screw centrifuge sends out the pre-stage pretreatment mud cake for external transportation and disposal, the water outlet of the pre-stage pretreatment horizontal screw centrifuge is connected to the 2# water inlet of the crystallization and hardness removal device, and the water outlet of the crystallization and hardness removal device is connected to the water inlet of the clear water tank; the 1# water outlet of the clear water tank is connected to the water inlet of the pre-stage pretreatment multi-media filter through the pre-stage pretreatment filter pump; the 2# water outlet of the clear water tank is connected to the backwash water inlet of the pre-stage pretreatment multi-media filter through the pre-stage pretreatment multi-media filter backwash pump, the air outlet of the pre-stage pretreatment multi-media filter backwash fan is connected to the backwash air inlet of the pre-stage pretreatment multi-media filter, and the water outlet of the pre-stage pretreatment multi-media filter is connected to the water inlet of the ultrafiltration device;The air outlet of the ultrafiltration backwash fan is connected to the backwash air inlet of the ultrafiltration device, the backwash water outlets of the pre-stage pretreatment multi-media filter and the ultrafiltration device are connected to the 2# water inlet of the pre-stage pretreatment backwash water collection tank, the water outlet of the pre-stage pretreatment backwash water collection tank is connected to the 3# water inlet of the crystallization and hardness removal device through the pre-stage pretreatment backwash water booster pump, the water outlet of the ultrafiltration device is connected to the water inlet of the ultrafiltration water production tank, the 1# water outlet of the ultrafiltration water production tank is connected to the backwash water inlet of the ultrafiltration device through the ultrafiltration backwash pump, and the 2# water outlet of the ultrafiltration water production tank sends out the pre-stage pretreatment system water through the low-pressure reverse osmosis booster pump; the low-pressure reverse osmosis system, its structure includes a low-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a low-pressure reverse osmosis security filter, a low-pressure reverse osmosis device, a low-pressure reverse osmosis concentrated water tank, and a recycled water tank , low-pressure reverse osmosis high-pressure pump, low-pressure reverse osmosis concentrated water delivery pump, and reused water delivery pump; wherein the outlet water of the pre-stage pretreatment system is connected to the water inlet of the low-pressure reverse osmosis security filter, the outlet of the low-pressure reverse osmosis antiscalant and reducing agent dosing device is also connected to the water inlet of the low-pressure reverse osmosis security filter, the outlet of the low-pressure reverse osmosis security filter is connected to the water inlet of the low-pressure reverse osmosis device through a low-pressure reverse osmosis high-pressure pump, the water output port of the low-pressure reverse osmosis device is connected to the 1# water inlet of the reused water tank, the water output of the concentrated evaporation system is connected to the 2# water inlet of the reused water tank, the outlet of the reused water tank delivers the reused water through the reused water delivery pump, the concentrated water outlet of the low-pressure reverse osmosis device is connected to the water inlet of the low-pressure reverse osmosis concentrated water tank, and the outlet of the low-pressure reverse osmosis concentrated water tank delivers the low-pressure reverse osmosis concentrated water through the low-pressure reverse osmosis concentrated water delivery pump; The concentrated water pretreatment system comprises a hardness and silicon removal device, a sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for concentrated water pretreatment, a concentrated water pretreatment sludge concentration tank, a concentrated water pretreatment horizontal screw centrifuge, an ozone contact oxidation tank, an ozone generating device, an oxidation water tank, a concentrated water pretreatment multi-media filter, a softening bed, a resin regeneration device, a tubular ultrafiltration device, a concentrated water pretreatment system outlet tank, a concentrated water pretreatment backwash water collection tank, a concentrated water pretreatment multi-media filter backwash fan, a concentrated water pretreatment sludge pump, a concentrated water pretreatment sludge feed pump, a concentrated water pretreatment filter pump, a concentrated water pretreatment multi-media filter backwash pump, a tubular ultrafiltration backwash pump, a concentrated water pretreatment outlet water delivery pump, and a concentrated water Pretreatment backwash water lifting pump; wherein the low-pressure reverse osmosis concentrated water is connected to the 1# water inlet of the hardness and silicon removal device, the drug outlet of the sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device of the concentrated water pretreatment is connected to the drug inlet of the hardness and silicon removal device, the mud discharge port of the hardness and silicon removal device is connected to the mud inlet of the concentrated water pretreatment sludge thickening tank through the concentrated water pretreatment mud discharge pump, the mud outlet of the concentrated water pretreatment sludge thickening tank is connected to the mud inlet of the concentrated water pretreatment horizontal screw centrifuge through the concentrated water pretreatment sludge feed pump, the concentrated water pretreatment mud cake is sent out from the mud outlet of the concentrated water pretreatment horizontal screw centrifuge, the water outlet of the concentrated water pretreatment horizontal screw centrifuge is connected to the 2# water inlet of the hardness and silicon removal device, and the water outlet of the hardness and silicon removal device is connected to the ozone connection The water inlet of the contact oxidation tank and the ozone outlet of the ozone generator are connected to the air inlet of the ozone contact oxidation tank, and the water outlet of the ozone contact oxidation tank is connected to the water inlet of the oxidation water tank; the 1# water outlet of the oxidation water tank is connected to the water inlet of the concentrated water pretreatment multi-media filter through the concentrated water pretreatment filter pump, the 2# water outlet of the oxidation water tank is connected to the backwash water inlet of the concentrated water pretreatment multi-media filter through the concentrated water pretreatment multi-media filter backwash pump, the air outlet of the concentrated water pretreatment multi-media filter backwash fan is connected to the backwash air inlet of the concentrated water pretreatment multi-media filter, the water outlet of the concentrated water pretreatment multi-media filter is connected to the water inlet of the softening bed, and the drug outlet of the resin regeneration device is connected to the regeneration liquid inlet of the softening bed. The outlet of the softening bed is connected to the water inlet of the tubular ultrafiltration device; the outlet of the tubular ultrafiltration device is connected to the water inlet of the concentrated water pretreatment system outlet pool, the 1# outlet of the concentrated water pretreatment system outlet pool sends out the concentrated water pretreatment system outlet water through the concentrated water pretreatment outlet water delivery pump, and the 2# outlet of the concentrated water pretreatment system outlet pool is connected to the backwash water inlet of the tubular ultrafiltration device through the tubular ultrafiltration backwash pump; the backwash water outlet of the concentrated water pretreatment multi-media filter and the tubular ultrafiltration device, and the regeneration liquid outlet of the softening bed are all connected to the water inlet of the concentrated water pretreatment backwash water collection pool, and the outlet of the concentrated water pretreatment backwash water collection pool is connected to the 3# water inlet of the hardness and silicon removal device through the concentrated water pretreatment backwash water lifting pump; The concentration and evaporation system comprises a medium-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a medium-pressure reverse osmosis security filter, a medium-pressure reverse osmosis device, a medium-pressure reverse osmosis concentrated water tank, a high-pressure reverse osmosis scale inhibitor dosing device, a high-pressure reverse osmosis security filter, a high-pressure reverse osmosis device, a high-pressure reverse osmosis concentrated water tank, an evaporation and crystallization device, a medium-pressure reverse osmosis high-pressure pump, a high-pressure reverse osmosis booster pump, a high-pressure reverse osmosis high-pressure plunger pump, and a high-pressure reverse osmosis concentrated water delivery pump; wherein The outlet of the concentrated water pretreatment system is connected to the water inlet of the medium-pressure reverse osmosis security filter, the outlet of the medium-pressure reverse osmosis antiscalant and reducing agent dosing device is also connected to the water inlet of the medium-pressure reverse osmosis security filter, the outlet of the medium-pressure reverse osmosis security filter is connected to the water inlet of the medium-pressure reverse osmosis device through a medium-pressure reverse osmosis high-pressure pump, the concentrated water outlet of the medium-pressure reverse osmosis device is connected to the water inlet of the medium-pressure reverse osmosis concentrated water tank, and the outlet of the medium-pressure reverse osmosis concentrated water tank is connected to the water inlet of the high-pressure reverse osmosis security filter through a high-pressure reverse osmosis booster pump; the outlet of the high-pressure reverse osmosis antiscalant dosing device is also connected to the water inlet of the medium-pressure reverse osmosis security filter. To the water inlet of the high-pressure reverse osmosis security filter, the water outlet of the high-pressure reverse osmosis security filter is connected to the water inlet of the high-pressure reverse osmosis device through a high-pressure reverse osmosis high-pressure plunger pump, the concentrate outlet of the high-pressure reverse osmosis device is connected to the water inlet of the high-pressure reverse osmosis concentrate water tank, the water outlet of the high-pressure reverse osmosis concentrate water tank is connected to the liquid inlet of the evaporation crystallization device through a high-pressure reverse osmosis concentrate water delivery pump, the salt outlet of the evaporation crystallization device sends out the crystallized salt, the water outlet of the medium-pressure reverse osmosis device, the water outlet of the high-pressure reverse osmosis device and the condensed water outlet of the evaporation crystallization device are combined to send out the concentrated evaporation system water.

2. The working method of the qualified sewage resource and liquid zero discharge treatment device according to claim 1 is characterized by: The pre-treatment system in step 1) includes a regulating tank, an aerated biological filter, an intermediate water tank, a crystallization and hardness removal device, a pre-treatment sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device, a pre-treatment backwash water collection tank, a pre-treatment sludge concentration tank, a pre-treatment horizontal screw centrifuge, a clear water tank, a pre-treatment multi-media filter, an ultrafiltration device, and an ultrafiltration water production tank; the aerated biological filter is used to further reduce the COD of the qualified sewage Cr The sewage is treated to COD≤40mg / L and BOD≤5mg / L, meeting the BOD5≤10mg / L, TDS≤1000mg / L, and Cl value of GB / T 18920-2020 Urban sewage recycling and urban miscellaneous water quality requirements. - ≤350mg / L, SO4 2- ≤500mg / L, reused as miscellaneous water; then by adding sodium hydroxide, magnesium hydroxide, sodium carbonate, the sewage is treated to a hardness of ≤50mg / L and SS ≤1mg / L through a crystallization and hardness removal device, multi-media filtration, and ultrafiltration.

3. The working method of the qualified sewage resource utilization and liquid zero discharge treatment device according to claim 1 is characterized by: The low-pressure reverse osmosis system in step 2) includes a low-pressure reverse osmosis antiscalant and reducing agent dosing device, a low-pressure reverse osmosis security filter, a low-pressure reverse osmosis device, a low-pressure reverse osmosis concentrated water tank, and a recycled water tank; Specifically, for the pre-treatment effluent with TDS of 1000-2000mg / L, COD≤40mg / L, hardness≤50mg / L, and SS≤1mg / L, low-pressure reverse osmosis with a recovery rate of 67-87.5% is used to carry out 3-8 times primary concentration and desalination to obtain low-pressure reverse osmosis concentrated water with TDS of 6000-16000mg / L, COD≤160mg / L, hardness≤200mg / L, SS≤4mg / L and low-pressure reverse osmosis produced water with TDS≤60mg / L.

4. The working method of the qualified sewage resource utilization and liquid zero discharge treatment device according to claim 1 is characterized by: The concentrated water pretreatment system in step 3) includes a hardness and silicon removal device, a sodium hydroxide, magnesium hydroxide, sodium carbonate and sulfuric acid dosing device for concentrated water pretreatment, a concentrated water pretreatment sludge concentration tank, a concentrated water pretreatment horizontal screw centrifuge, an ozone contact oxidation tank, an ozone generating device, an oxidation water tank, a concentrated water pretreatment multi-media filter, a softening bed, a resin regeneration device, a tubular ultrafiltration device, a concentrated water pretreatment system outlet tank, and a concentrated water pretreatment backwash water collection tank; Specifically, for low-pressure reverse osmosis concentrated water with TDS of 6000-16000mg / L, COD≤160mg / L, hardness≤200mg / L, and SS≤4mg / L, sodium hydroxide, magnesium hydroxide, and sodium carbonate are added in sequence to remove hardness and silicon, ozone oxidation is used to reduce COD, resin is softened, and concentrated water is pre-treated with multi-media filters and tubular ultrafiltration. The low-pressure reverse osmosis concentrated water is treated to have a hardness of ≤5mg / L, COD≤10mg / L, SiO2≤5mg / L, and SS≤1mg / L.

5. The working method of the qualified sewage resource utilization and liquid zero discharge treatment device according to claim 1 is characterized by: The concentration and evaporation system in step 4) includes a medium-pressure reverse osmosis scale inhibitor and reducing agent dosing device, a medium-pressure reverse osmosis security filter, a medium-pressure reverse osmosis device, a medium-pressure reverse osmosis concentrated water tank, a high-pressure reverse osmosis scale inhibitor dosing device, a high-pressure reverse osmosis security filter, a high-pressure reverse osmosis device, a high-pressure reverse osmosis concentrated water tank, and an evaporation and crystallization device; specifically, for the concentrated water pretreatment system effluent with a TDS of 6000-16000 mg / L, hardness ≤5 mg / L, COD ≤10 mg / L, SiO2 ≤5 mg / L, and SS ≤1 mg / L, a medium-pressure reverse osmosis with a recovery rate of 67-80% is used for 3-5 times concentration to obtain medium-pressure reverse osmosis concentrated water with a TDS of 18000-80000 mg / L and a TDS of ≤480 The medium-pressure reverse osmosis produced water is 50-80% of medium-pressure reverse osmosis concentrated water, and then the medium-pressure reverse osmosis concentrated water is concentrated 2-5 times by high-pressure reverse osmosis with a recovery rate of 50-80%, so as to obtain high-pressure reverse osmosis concentrated water with a TDS of 90000-160000 mg / L and high-pressure reverse osmosis produced water with a TDS≤2000 mg / L. Finally, the high-pressure reverse osmosis concentrated water is evaporated through MVR to produce mixed salt and evaporation crystallization condensed water with a TDS≤300 mg / L. The low-pressure reverse osmosis produced water with a TDS≤60 mg / L, the medium-pressure reverse osmosis produced water with a TDS≤480 mg / L, the high-pressure reverse osmosis produced water with a TDS≤2000 mg / L, and the evaporation crystallization condensed water with a TDS≤300 mg / L are mixed to form recycled water with a TDS≤300 mg / L, which is much higher than the COD content required by the HG / T 3923-2007 recycled water quality standard for circulating cooling water. Cr ≤80mg / L, BOD5≤5mg / L, SS≤20mg / L, TDS≤1000mg / L, total hardness≤500mg / L, Cl - Recycled water quality ≤500mg / L.

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