High-salt industrial sewage treatment process and device

Abstract

The invention relates to the field of high-salt industrial sewage treatment, and provides a high-salt industrial sewage treatment process and device which comprises an adjusting homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multi-stage biological aeration filter tank, an efficient biological reaction tank, a filter cloth filter and a monitoring water tank. A water outlet of the adjusting homogenizing tank is connected with a water inlet of the high-density sedimentation tank, a water outlet of the high-density sedimentation tank is connected with a water inlet of the ozone contact oxidation tank, a water outlet of the ozone contact oxidation tank is connected with a water inlet of the multi-stage biological aeration filter tank, and a water outlet of the multi-stage biological aeration filter tank is connected with a water inlet of the efficient biological reaction tank. A water outlet of the efficient biological reaction tank is connected with a water inlet of the filter cloth filter, a water outlet of the filter cloth filter is connected with a water inlet of the monitoring water tank, the monitoring water tank discharges water through the water outlet, and the high-salinity sewage treatment device can effectively treat high-salinity sewage.

Description

Technical Field

[0001] The invention relates to the field of high-salt industrial wastewater treatment, and in particular to a high-salt industrial wastewater treatment process and device. Background Art

[0002] The Nangang Ethylene Project is a representative project of Sinopec Tianjin Nangang high-end new materials project cluster. With the 1.2 million tons / year Nangang ethylene cracking unit as the leader, the industrial chain extends to the construction of high-end new materials units such as α-olefins and ultra-high molecular weight polyethylene.

[0003] It is necessary to treat the drainage from the ABS device, the acid-base neutralization wastewater from the condensate station and the RO concentrated water from the sewage plant so that they meet the standards before being discharged.

[0004] ABS device drainage, condensate station acid-base neutralization wastewater and sewage plant RO concentrated water are high-salt wastewater.

[0005] For example, a high-salt sewage treatment system disclosed in application number: CN201720435131.1 includes a sedimentation tank, a solid-liquid separator, an intermediate water tank, a multi-media filter, an electrodialysis device, a water storage tank, an acidification anaerobic tank, an aerobic degradation tank, a membrane bioreactor, a sterilization tank and a clear water tank which are connected in sequence through pipelines. The high-salt sewage is discharged into the sedimentation tank for precipitation, and the solids after precipitation and separation enter the sludge tank respectively. The high-concentration brine dialyzed is sucked into the high-salt water collection box, the acidification anaerobic tank is connected to the sludge tank, the aerobic degradation tank is connected to the sludge tank, and a detection device is provided at the outlet of the sterilization tank.

[0006] However, in the process of treating ABS device drainage, acid-base neutralization wastewater from condensate stations and RO concentrated water from sewage plants, the following problems exist:

[0007] 1. There are many suspended solids in the sewage, which will affect the biodegradability of the subsequent sewage;

[0008] 2. Since the biodegradability of COD in RO concentrated water is very low, it is difficult to remove organic matter in sewage by direct biological methods;

[0009] 3. The multi-stage biological aeration filter often cannot adjust the internal aeration volume during operation, making it difficult to remove COD, ammonia nitrogen and total nitrogen at the same time;

[0010] 4. The biodegradability of sewage is poor, especially the COD in sewage is difficult to degrade. Summary of the invention

[0011] In order to solve the above problems, the present invention provides a high-salt industrial wastewater treatment process and device to solve the problem.

[0012] In order to achieve the above object, the present invention provides the following technical solutions:

[0013] A high-salt industrial wastewater treatment device comprises: a regulating homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multi-stage biological aeration filter, a high-efficiency biological reaction tank, a filter cloth filter and a monitoring water pool, wherein the water inlet of the regulating homogenizing tank is connected to the drainage pipes of the ABS device, the acid-base neutralization wastewater of the condensate water station and the RO concentrated water of the sewage plant, the water outlet of the regulating homogenizing tank is connected to the water inlet of the high-density sedimentation tank, the water outlet of the high-density sedimentation tank is connected to the water inlet of the ozone contact oxidation tank, the water outlet of the ozone contact oxidation tank is connected to the water inlet of the multi-stage biological aeration filter, the water outlet of the multi-stage biological aeration filter is connected to the water inlet of the high-efficiency biological reaction tank, the water outlet of the high-efficiency biological reaction tank is connected to the water inlet of the filter cloth filter, the water outlet of the filter cloth filter is connected to the water inlet of the monitoring water pool, and the monitoring water pool is discharged through the water outlet.

[0014] The high-density sedimentation tank includes: a coagulation zone, a flocculation zone, a sedimentation zone, a clarification zone, a reaction stabilizer, a solid waste incineration device and a dosing system. The reaction stabilizer is arranged at the bottom of the coagulation zone and the flocculation zone. The output end of the dosing system is connected with the coagulation zone and the flocculation zone. The water outlet of the clarification zone is connected with the water inlet of the ozone contact oxidation tank. A scraper is arranged in the sedimentation zone. The sludge precipitated at the bottom of the sedimentation zone is discharged into the solid waste incineration device through the scraper.

[0015] The ozone contact oxidation tank comprises: an ozone contact oxidation tank body, an ozone diffuser, an ozone generator and an ozone destroyer. The water inlet of the ozone contact oxidation tank body is connected to the water outlet of the high-density sedimentation tank, the ozone generator is arranged on the upper side of the ozone contact oxidation tank body, the ozone diffuser is arranged inside the ozone contact oxidation tank body, the ozone destroyer is arranged on one side of the ozone contact oxidation tank body, and its output end is connected to the outside world. The water outlet of the ozone contact oxidation tank body is connected to the water inlet of the multi-stage biological aeration filter.

[0016] The multi-stage biological aeration filter comprises a biological filter body, the water inlet of the biological filter body is connected to the water outlet of the ozone contact oxidation tank body, the biological filter body is provided with four chambers, each of which has five stages connected in series, the biological filter body comprises: an aerobic section and an anoxic section, the first stage and the fifth stage are aerobic sections, the second stage to the fourth stage are anoxic sections, each stage is provided with an aeration facility, the biological filter body is also provided with a carbon source addition system, and the water outlet of the biological filter body is connected to the water inlet of the high-efficiency biological reaction tank.

[0017] The high-efficiency biological reaction pool is provided with multiple groups, and the multiple groups of high-efficiency biological reaction pools are installed in parallel with an upper reflux structure. Special bacterial filter materials are arranged inside the high-efficiency biological reaction pool, an aeration device is arranged at the bottom of the high-efficiency biological reaction pool, and the water outlet of the high-efficiency biological reaction pool is connected with the water inlet of the filter cloth filter.

[0018] The filter cloth filter comprises a plurality of filter discs vertically and parallelly installed in the equipment, the outer side of the filter discs is wrapped with filter cloth, the average mesh diameter of the filter cloth is not greater than 10 microns, and the water outlet of the filter cloth filter is connected to the water inlet of the monitoring pool.

[0019] The filter cloth filter is cleaned by a backwash tank.

[0020] The high-salt industrial wastewater treatment process includes the following steps:

[0021] S1: discharge the ABS device drainage, acid-base neutralization wastewater from the condensate station and RO concentrated water from the sewage plant into the regulating homogenization tank for homogenization treatment;

[0022] S2: The sewage in the regulating homogenization tank is discharged into the high-density sedimentation tank, and the sewage is flocculated and precipitated by adding FeCL3 and PAM. After sedimentation and separation, the precipitated sludge is discharged to the solid waste incineration device, and the treated sewage is discharged into the ozone contact oxidation tank;

[0023] S3: The sewage is contacted with ozone in the ozone contact oxidation tank. The residence time of the sewage and ozone in the tank is not less than 1.5 hours, and the stabilization time is not less than 1 hour. The treated sewage is discharged into the multi-stage biological aeration filter tank;

[0024] S4: The sewage passes through the aerobic section of the multi-stage biological aeration filter, and the dissolved oxygen is 2-4 mg / L. The main function is to remove the original COD in the sewage and the excess carbon source added but not removed in the anoxic section, and convert the carbon source and organic matter in the sewage into carbon dioxide and water. The sewage passes through the anoxic section of the multi-stage biological aeration filter, and the dissolved oxygen is controlled at 0.2-0.5 mg / L for denitrification. Denitrifying bacteria are inoculated, and the nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen gas under the action of denitrifying bacteria and escape from the water body, realizing the removal of TN. Then the sewage is discharged into the high-efficiency biological reactor;

[0025] S5: When the sewage enters the filter media of the high-efficiency biological reactor, it is oxidized and adsorbed by special bacteria between the filter media to remove the difficult-to-degrade organic matter in the water, and then the sewage is discharged into the filter cloth filter;

[0026] S6: Sewage enters the filter through the inlet weir plate, passes through the filter cloth under the action of gravity, and the filtered water enters the central drum, and then flows into the monitoring pool from the outlet;

[0027] S7: Take samples of the sewage in the monitoring pool and discharge them after they pass the test.

[0028] The invention has the advantages that the high-density sedimentation tank can reduce the suspended solids in the incoming water and the subsequent ozone consumption, and can also remove TP in the sewage by adding iron salts; since the biodegradability of COD in RO concentrated water is very low, it is difficult to directly use biological methods to remove organic matter in the sewage, so the "ozone contact oxidation tank + multi-stage biological aeration filter" process is used to first increase the B / C ratio of the sewage, and then remove the COD and total nitrogen in the sewage through the multi-stage biological aeration filter; the multi-stage biological aeration filter can flexibly control DO by adjusting the aeration amount of each reactor in each tank body during operation, so as to flexibly realize aerobic and anoxic environments between reactors at each level, so as to achieve the purpose of removing COD, ammonia nitrogen and total nitrogen at the same time; the high-efficiency biological reaction tank is specially developed for sewage with low load and poor biodegradability, and adopts a special biological flora for difficult-to-degrade COD, which is inoculated on a special high-efficiency biological carrier to form a stable biofilm that can tolerate multiple substrates as energy sources. Under aerobic conditions, through efficient biological contact oxidation, the difficult-to-remove COD in the sewage is further biodegraded, and ultimately the endogenous substances of the microorganisms are synthesized or used for metabolism, thus physically eliminating the organic matter in the water. After the successful biofilm formation, even if the incoming water is nutrient-poor and there is no additional nutrient source, the difficult-to-degrade COD in the water can still be used as an energy source to maintain the stability and biological activity of the bacteria, thereby continuously removing the COD in the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a process flow chart of the present invention;

[0032] Figure 3 It is a schematic diagram of the dosing system of the high-density sedimentation tank of the present invention;

[0033] Figure 4 It is a schematic diagram of the dosing system of the multi-stage biological aeration filter of the present invention. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] Embodiment 1, combined with Figure 1 , Figure 2 , Figure 3 and Figure 4 To explain:

[0038] High-salt industrial wastewater treatment equipment, including: regulating homogenization tank, high-density sedimentation tank, ozone contact oxidation tank, multi-stage biological aeration filter, high-efficiency biological reaction tank, filter cloth filter and monitoring water tank,

[0039] There are 2 sets of high-density sedimentation tanks, and the water processing capacity of each tank is 155t / h.

[0040] One ozone contact oxidation pool, 2 groups in parallel, 2 levels in parallel in each group, with a processing capacity of 300t / h. It includes power supply and control system, liquid oxygen storage tank, ozone generator, ozone contact pool, cooling water system (heat exchanger), and ozone tail gas destroyer.

[0041] One multi-stage biological aeration filter tank, with a water treatment capacity of 300t / h. Each multi-stage biological filter tank has 4 chambers, each with 5 stages connected in series.

[0042] One high-efficiency biological reactor with a water treatment capacity of 300t / h. Six high-efficiency biological reactors are connected in parallel.

[0043] 2 sets of cloth filters, with a water processing capacity of 300t / h.

[0044] It also includes two high-salt sewage regulating and homogenizing tanks and one emergency water tank.

[0045] The water inlet of the regulating homogenizing tank is connected to the drainage pipes of the ABS device, the acid-base neutralization wastewater of the condensate water station and the RO concentrated water of the sewage plant, the water outlet of the regulating homogenizing tank is connected to the water inlet of the high-density sedimentation tank, the water outlet of the high-density sedimentation tank is connected to the water inlet of the ozone contact oxidation tank, and a lifting facility is arranged in the reaction flow stabilizer of the flocculation zone of the high-density sedimentation tank. Under the promotion of the lifting facility, the sewage forms an internal circulation flow state, which is conducive to the growth and uniformity of the flocs. A certain flow rate is maintained by using strict hydraulic conditions without breaking the formed flocs. The sewage can be quickly separated after entering the sedimentation zone.

[0046] The outlet of the ozone contact oxidation tank is connected to the inlet of the multi-stage biological aeration filter. Ozone has extremely strong oxidizing and bactericidal properties, and its molecular state is extremely unstable. It can form hydroxyl free radicals, which have strong oxidizing effects, in water, which can quickly remove organic pollutants in wastewater and decompose itself into oxygen without causing secondary pollution.

[0047] The outlet of the multi-stage biological aeration filter is connected to the inlet of the high-efficiency biological reaction tank. The multi-stage biological filter adopts multi-stage parallel and multi-stage series forms. In order to adapt to the changes in influent water quality, aeration facilities are set up at each stage, which can realize flexible switching between anoxic and aerobic environments.

[0048] The outlet of the high-efficiency biological reactor is connected to the inlet of the filter cloth filter. The high-efficiency biological reactor is specially developed for low-load and poorly biodegradable sewage. It uses special biological bacteria for difficult-to-degrade COD, inoculates it on a special high-efficiency biological carrier, and forms a stable biofilm that can tolerate a variety of substrates as energy sources.

[0049] The water outlet of the filter cloth is connected to the water inlet of the monitoring pool. As the filtration proceeds, the filter cloth retains more substances. When the head loss through the filter cloth increases and reaches the preset backwashing level, the turntable needs to be cleaned, and the control system starts the backwashing process. After the cleaning is completed, after a short sewage discharge, the filter cloth filter can resume normal filtering operation. During cleaning, the filter cloth filter can filter continuously.

[0050] The monitoring pool is discharged through the outlet.

[0051] The high-density sedimentation tank includes: a coagulation zone, a flocculation zone, a sedimentation zone, a clarification zone, a reaction stabilizer, a solid waste incineration device and a dosing system. The reaction stabilizer is arranged at the bottom of the coagulation zone and the flocculation zone. The output end of the dosing system is connected with the coagulation zone and the flocculation zone. The water outlet of the clarification zone is connected with the water inlet of the ozone contact oxidation tank. A scraper is arranged in the sedimentation zone. The sludge precipitated at the bottom of the sedimentation zone is discharged into the solid waste incineration device through the scraper.

[0052] The high-density sedimentation tank is a compact sewage treatment system that integrates coagulation, flocculation, sedimentation clarification, and sludge concentration. The sewage is first fully mixed with the added FeCl3 and PAM agents through the coagulation and flocculation areas, and the agents are evenly released through the micropores on the dosing ring, thereby removing the pollutants SS and total phosphorus in the water, so that the effluent meets the design index requirements. At the same time, part of the sludge deposited at the bottom of the pool is discharged to the solid waste incineration device after staying for a period of time, and the other part of the sludge is returned to the flocculation area in front of the high-density tank, which not only enhances the system's impact resistance but also saves the addition of polymer agents. The inclined tube is a honeycomb block, the scraper is a suspended central drive rotary scraper (with frequency conversion), the height of the high-density sedimentation tank water distribution weir can be adjusted up and down (adjustable height 50mm), and the high-density sedimentation tank outlet has height adjustable measures.

[0053] The high-density sedimentation tank adjusts the dosage of ferric chloride and PAM in time through the effects of the flocculation tank flocs and the sedimentation tank, combined with the online turbidity analyzer of the effluent and the chemical analysis of the suspended solids in the effluent water quality of the high-density sedimentation tank.

[0054] The mud level is determined by the mud level meter in the sedimentation tank, and the mud level is controlled not to exceed 1m. Mud discharge operations are performed according to the actual mud level conditions.

[0055] Regularly flush the inclined plates in the sedimentation area to prevent sludge from adhering to the inclined plates and affecting the water discharge effect.

[0056] The ozone contact oxidation tank comprises: an ozone contact oxidation tank body, an ozone diffuser, an ozone generator and an ozone destroyer. The water inlet of the ozone contact oxidation tank body is connected to the water outlet of the high-density sedimentation tank, the ozone generator is arranged on the upper side of the ozone contact oxidation tank body, the ozone diffuser is arranged inside the ozone contact oxidation tank body, the ozone destroyer is arranged on one side of the ozone contact oxidation tank body, and its output end is connected to the outside world. The water outlet of the ozone contact oxidation tank body is connected to the water inlet of the multi-stage biological aeration filter.

[0057] Check that the oxygen source boundary pressure is not higher than 0.5MPa, whether the pressure reducing component is reduced to 0.1MPa normally, control the air intake flow, adjust the voltage and frequency of the ozone generator, produce ozone that meets the requirements, and ensure the effect and optimization of ozone addition. Check the temperature of the ozone generator, and adjust the pressure and flow of the internal and external circulating cooling water in time.

[0058] Check the operation of the ozone contact oxidation tank, adjust the ozone dosage, and ensure that the effluent quality meets the treatment requirements of the multi-stage biological filter.

[0059] The ozone dosage is adjusted by sampling and analyzing the COD of the inlet and outlet water of the ozone contact oxidation pond and the ozone online analyzer.

[0060] Check whether the ozone exhaust gas contains foam and a large amount of moisture, and deal with it in time to avoid it entering the destroyer.

[0061] The effluent from the high-density sedimentation tank flows by gravity to the ozone contact oxidation tank, where it reacts with ozone to improve the biodegradability of the sewage. In the ozone contact tank, the ozone gas is divided into countless tiny bubbles through the ozone diffuser, realizing the mass transfer process of ozone from the gas phase to the liquid phase. The amount of ozone added can be adjusted proportionally according to the measured value of the inlet flow rate. The oxygen required by the ozone generator is transported from outside the boundary to the sewage joint venture company through a pipeline by Air Liquide.

[0062] The residence time of sewage and ozone in the pool is not less than 1.5 hours, and the stabilization time is not less than 1 hour, which meets the requirements of improving the biodegradability of sewage and removing part of COD.

[0063] The residual ozone tail gas is discharged into the air after being treated by the destroyer, and can also be sent to the deodorization device by the tail gas conveying fan.

[0064] An ozone leak detector is installed on site, and the lower detection limit should be lower than 0.15mg / m3 and the upper detection limit should be higher than 0.3mg / m3.

[0065] The multi-stage biological aeration filter comprises a biological filter body, the water inlet of the biological filter body is connected to the water outlet of the ozone contact oxidation tank body, the biological filter body is provided with four chambers, each of which has five stages connected in series, the biological filter body comprises: an aerobic section and an anoxic section, the first stage and the fifth stage are aerobic sections, the second stage to the fourth stage are anoxic sections, each stage is provided with an aeration facility, the biological filter body is also provided with a carbon source addition system, and the water outlet of the biological filter body is connected to the water inlet of the high-efficiency biological reaction tank.

[0066] There are 4 multi-stage biofilters in parallel operation, each with 5 stages in series. The 1st and 5th stages are aerobic sections with dissolved oxygen at 2-4 mg / L. Their main function is to remove the original COD in the sewage and the excess carbon source added but not removed in the anoxic section, and convert the carbon source and organic matter in the sewage into carbon dioxide and water. The 2nd to 4th stages are anoxic sections, with dissolved oxygen controlled at 0.2-0.5 mg / L, which are used for denitrification and inoculation of denitrifying bacteria. Nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen gas under the action of denitrifying bacteria and escape from the water body, realizing the removal of TN. In order to adapt to the changes in the influent water quality, aeration facilities are set up at each stage, which can realize flexible switching between anoxic and aerobic environments. The effective pool capacity of the biofilter is 1740m3, the COD removal load is 0.345kgCOD / (m3.d), and the total nitrogen removal load is 0.325kg / (m3.d). The treated effluent COD≤70mg / L, TN≤10mg / L. In order to ensure sufficient carbon source for denitrification, sodium acetate is added to the multi-stage biological filter as an external carbon source, which is centrally supplied by the sodium acetate dosing facilities in the dosing room.

[0067] The multi-stage aerated biological filter uses the inlet total nitrogen online analyzer AT-19009 to display the total nitrogen in the water, ensure that the effluent total nitrogen is less than 10mg / L, calculate the amount of sodium acetate added, adjust the inlet of the multi-stage aerated biological filter to balance, control the aeration air volume within a reasonable range, and ensure further biodegradation of organic pollutants after biochemical treatment. The effluent COD online analyzer AT-19010 displays the value within 70mg / L, and regularly backwashes the packing layer of the aerated biological filter to restore the filtration performance and improve the activity of the biofilm.

[0068] The high-efficiency biological reaction pool is provided with multiple groups, and the multiple groups of high-efficiency biological reaction pools are installed in parallel with an upper reflux structure. Special bacterial filter materials are arranged inside the high-efficiency biological reaction pool, an aeration device is arranged at the bottom of the high-efficiency biological reaction pool, and the water outlet of the high-efficiency biological reaction pool is connected with the water inlet of the filter cloth filter.

[0069] There are 6 high-efficiency biological reactors in total, which are operated in parallel and adopt an upward flow structure. Under aerobic conditions in the reactor, the high-salinity sewage removes the difficult-to-degrade organic matter in the water through the oxidation and adsorption of special bacteria attached to the surface of the filter material and between the filter materials. A perforated aeration pipe is provided at the bottom of the reactor, and air is provided by an aeration blower; a backwash filter head is also provided at the bottom, which adopts a combined air-water backwashing method, with the backwash water coming from the backwash water pump and the backwash gas coming from the backwash fan. The COD of the effluent from the reactor is ≤30mg / L. Under aerobic conditions, the difficult-to-remove COD in the sewage is further biodegraded through high-efficiency biological contact oxidation, and finally the endogenous substances of microorganisms are synthesized or used for metabolism, thereby eliminating the organic matter in the water from the material. After the successful biofilm formation of this technology, even if the influent is nutrient-poor and there is no additional nutrient source, the difficult-to-degrade COD in the water can still be used as an energy source to maintain the stability and biological activity of bacteria, thereby continuously removing COD from the water.

[0070] The special bacterial flora includes at least one microbial species selected from the following: Bacillus, Comamonas, Arthrobacter, Micrococcus, Pseudomonas, Pediococcus, Achromobacter, Flavobacterium, Mycobacterium, Flavobacterium, Oligotrophomonas and yeast. Under aerobic conditions, the highly efficient ABR composite functional bacterial flora uses the refractory COD in the water as an energy source to maintain the stability of the functional bacteria, further biodegrades the organic matter in the sewage, and finally synthesizes endogenous substances of microorganisms or uses them for metabolism, fundamentally eliminating the refractory organic pollutants in the water. There is a rich and stable functional bacterial flora on the surface of the ABR carrier of the refractory COD influent for a long time, and the biomass is greater than 0.1 mg / g carrier (by dry weight).

[0071] Adjust the water inlet of the high-efficiency biological reactor to balance it, control the aeration air volume within a reasonable range, and ensure further biodegradation of organic pollutants after biochemical treatment. Through sampling and analysis, the effluent COD is within 30mg / L.

[0072] The filter cloth filter comprises a plurality of filter discs vertically and parallelly installed in the equipment, the outer side of the filter discs is wrapped with filter cloth, the average mesh diameter of the filter cloth is not greater than 10 microns, and the water outlet of the filter cloth filter is connected to the water inlet of the monitoring pool.

[0073] The main function of the filter cloth filter is to further remove suspended matter. It consists of multiple groups of filter discs installed vertically and parallel in the equipment. The filter cloth is wrapped on the outside of the filter disc and is made of new nanofiber material. The average mesh diameter is not more than 10 microns, with large flux and impurities not easy to adhere. The operation of the equipment includes three states: filtration, cleaning and mud discharge. During filtration, sewage enters the filter through the water inlet weir plate, passes through the filter cloth under the action of gravity, and the filtered water enters the central drum and then flows out from the outlet. As the filtration proceeds, the amount of material retained by the filter cloth increases. When the head loss through the filter cloth increases and reaches the preset backwash level, the turntable needs to be cleaned, and the control system starts the backwash process. After the cleaning is completed, after a short sewage discharge, the filter cloth filter can resume normal filtration operation. During cleaning, the filter cloth filter can filter continuously. It is planned to add 10% sodium hypochlorite solution into the equipment to prevent microbial fouling.

[0074] The filter cloth filter is cleaned by a backwash tank.

[0075] Working principle of the present invention: When the present invention is used, firstly, the drainage of the ABS device, the acid-base neutralization wastewater of the condensate water station and the RO concentrated water of the sewage plant are discharged into the regulating homogenization tank for homogenization treatment; the sewage in the regulating homogenization tank is discharged into the high-density sedimentation tank, and the sewage is flocculated and precipitated by adding FeCL3 and PAM. After sedimentation and separation, the precipitated sludge is discharged to the solid waste incineration device, and the treated sewage is discharged into the ozone contact oxidation tank; the sewage contacts and reacts with the ozone in the ozone contact oxidation tank, and the residence time of the sewage and ozone in the tank is not less than 1.5h, and the stabilization time is not less than 1 hour. The treated sewage is discharged into the multi-stage biological aeration filter tank ; The sewage passes through the aerobic section of the multi-stage biological aeration filter, and the dissolved oxygen is 2-4 mg / L. The main function is to remove the original COD in the sewage and the excess carbon source added but not removed in the anoxic section, and convert the carbon source and organic matter in the sewage into carbon dioxide and water. The sewage passes through the anoxic section of the multi-stage biological aeration filter, and the dissolved oxygen is controlled at 0.2-0.5 mg / L for denitrification. Denitrifying bacteria are inoculated, and the nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen gas under the action of denitrifying bacteria and escape from the water body, realizing the removal of TN, and then the sewage is discharged into the high-efficiency biological reactor; The sewage enters the filter material of the high-efficiency biological reactor and passes through the filter material. The special bacteria group performs oxidation and adsorption to remove the difficult-to-degrade organic matter in the water, and then the sewage is discharged into the filter cloth filter; the sewage enters the filter through the water inlet weir plate, passes through the filter cloth under the action of gravity, and the filtered water enters the central drum, and then flows into the monitoring pool from the outlet; the sewage in the monitoring pool is sampled and discharged after passing the sampling. The present invention can reduce the suspended matter in the incoming water and reduce the subsequent ozone consumption through the high-density sedimentation tank, and can also remove TP in the sewage by adding iron salt; because the biodegradability of COD in RO concentrated water is very low, it is difficult to remove organic matter in sewage by direct biological method, so through "ozone contact oxidation tank + multi-stage biological exposure The "air filter" process first increases the B / C ratio of the sewage, and then removes COD and total nitrogen in the sewage through a multi-stage biological aeration filter; the multi-stage biological aeration filter can flexibly control DO by adjusting the aeration volume of each reactor in each tank during operation, so as to flexibly achieve aerobic and anoxic environments between reactors at each level, and achieve the purpose of removing COD, ammonia nitrogen and total nitrogen at the same time; the high-efficiency biological reactor is specially developed for low-load sewage with poor biodegradability. It uses special biological bacteria for difficult-to-degrade COD, inoculates it on a special high-efficiency biological carrier, and forms a stable biofilm that can tolerate a variety of substrates as an energy source. Under aerobic conditions, the difficult-to-remove COD in the sewage is further biodegraded through high-efficiency biological contact oxidation, and finally synthesizes endogenous substances of microorganisms or uses them for metabolism, eliminating organic matter in the water from the material. After the successful biofilm formation of this technology, even if the influent water is nutrient-poor and there is no additional nutrient source, the difficult-to-degrade COD in the water can still be used as an energy source to maintain bacterial stability and biological activity, thereby continuously removing COD in the water.

[0076] For those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim involved.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. High-salt industrial wastewater treatment device, It is characterized in that include: A regulating homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multi-stage biological aeration filter, a high-efficiency biological reaction tank, a filter cloth filter and a monitoring water tank; the water inlet of the regulating homogenizing tank is connected to the drainage of the ABS device, the acid-base neutralization wastewater of the condensate water station and the drainage pipeline of the RO concentrated water of the sewage plant; the water outlet of the regulating homogenizing tank is connected to the water inlet of the high-density sedimentation tank, the water outlet of the high-density sedimentation tank is connected to the water inlet of the ozone contact oxidation tank, the water outlet of the ozone contact oxidation tank is connected to the water inlet of the multi-stage biological aeration filter, the water outlet of the multi-stage biological aeration filter is connected to the water inlet of the high-efficiency biological reaction tank, and the water outlet of the high-efficiency biological reaction tank is connected to the filter cloth. The water inlet of the filter is connected, and the water outlet of the filter cloth filter is connected to the water inlet of the monitoring pool. The monitoring pool is discharged through the water outlet. The effluent indicators of the high-salt and high-density sedimentation tank are oil content ≤1mg / l, SS ≤10mg / l, TP ≤0.3mg / l. The ozone contact oxidation tank flows into the high-salt biological filter by gravity, PH6-9. The effluent water quality indicators of the multi-stage biological filter are COD ≤70mg / L, TN ≤10mg / L. The effluent water quality indicators of the high-efficiency biological reaction tank are COD ≤30mg / L, TN ≤10mg / L. The effluent of the filter cloth filter enters the external discharge monitoring pool, and the concentration of suspended solids is ≤5mg / l.

2. The high-salt industrial wastewater treatment device according to claim 1, It is characterized in that The high-density sedimentation tank comprises: a coagulation zone, a flocculation zone, a sedimentation zone, a clarification zone, a reaction stabilizer, a solid waste incineration device and a dosing system. The reaction stabilizer is arranged at the bottom of the coagulation zone and the flocculation zone. The output end of the dosing system is connected with the coagulation zone and the flocculation zone. The water outlet of the clarification zone is connected with the water inlet of the ozone contact oxidation tank. A scraper is arranged in the sedimentation zone. The sludge precipitated at the bottom of the sedimentation zone is discharged into the solid waste incineration device through the scraper. A lifting facility is arranged in the reaction stabilizer in the flocculation zone of the high-density sedimentation tank. The sewage forms an internal circulation flow state under the promotion of the reaction stabilizer, which is conducive to the growth and uniformity of the flocs. A certain flow rate is maintained by strict hydraulic conditions without breaking the formed flocs. The sewage can be quickly separated after entering the sedimentation zone.

3. The high-salt industrial wastewater treatment device according to claim 2, It is characterized in that The ozone contact oxidation tank comprises: an ozone contact oxidation tank body, an ozone diffuser, an ozone generator and an ozone destroyer. The water inlet of the ozone contact oxidation tank body is connected to the water outlet of the high-density sedimentation tank, the ozone generator is arranged on the upper side of the ozone contact oxidation tank body, the ozone diffuser is arranged inside the ozone contact oxidation tank body, the ozone destroyer is arranged on one side of the ozone contact oxidation tank body, and its output end is connected to the outside world. The water outlet of the ozone contact oxidation tank body is connected to the water inlet of the multi-stage biological aeration filter.

4. The high-salt industrial wastewater treatment device according to claim 3, It is characterized in that The multi-stage biological aeration filter comprises a biological filter body, the water inlet of the biological filter body is connected to the water outlet of the ozone contact oxidation tank body, the biological filter body is provided with four chambers, each of which has five stages connected in series, the biological filter body comprises: an aerobic section and an anoxic section, the first stage and the fifth stage are aerobic sections, the second stage to the fourth stage are anoxic sections, each stage is provided with an aeration facility, the biological filter body is also provided with a carbon source addition system, and the water outlet of the biological filter body is connected to the water inlet of the high-efficiency biological reaction tank.

5. The high-salt industrial wastewater treatment device according to claim 4, It is characterized in that The high-efficiency biological reaction pool is provided with multiple groups, and the multiple groups of high-efficiency biological reaction pools are installed in parallel with an upper reflux structure. Special bacterial filter materials are arranged inside the high-efficiency biological reaction pool, an aeration device is arranged at the bottom of the high-efficiency biological reaction pool, and the water outlet of the high-efficiency biological reaction pool is connected with the water inlet of the filter cloth filter.

6. The high-salt industrial wastewater treatment device according to claim 5, It is characterized in that The filter cloth filter comprises a plurality of filter discs vertically and parallelly installed in the equipment, the outer side of the filter discs is wrapped with filter cloth, the average mesh diameter of the filter cloth is not greater than 10 microns, and the water outlet of the filter cloth filter is connected to the water inlet of the monitoring pool.

7. The high-salt industrial wastewater treatment device according to claim 6, It is characterized in that The filter cloth filter is cleaned by a backwash tank.

8. High-salt industrial wastewater treatment process, It is characterized in that The following steps are involved: S1: discharge the ABS device drainage, acid-base neutralization wastewater from the condensate station and RO concentrated water from the sewage plant into the regulating homogenization tank for homogenization treatment; S2: The sewage in the regulating homogenization tank is discharged into the high-density sedimentation tank, and the sewage is flocculated and precipitated by adding FeCL3 and PAM. After sedimentation and separation, the precipitated sludge is discharged to the solid waste incineration device, and the treated sewage is discharged into the ozone contact oxidation tank; S3: The sewage is contacted with ozone in the ozone contact oxidation tank. The residence time of the sewage and ozone in the tank is not less than 1.5 hours, and the stabilization time is not less than 1 hour. The treated sewage is discharged into the multi-stage biological aeration filter tank; S4: The sewage passes through the aerobic section of the multi-stage biological aeration filter, and the dissolved oxygen is 2-4 mg / L. The main function is to remove the original COD in the sewage and the excess carbon source added but not removed in the anoxic section, and convert the carbon source and organic matter in the sewage into carbon dioxide and water. The sewage passes through the anoxic section of the multi-stage biological aeration filter, and the dissolved oxygen is controlled at 0.2-0.5 mg / L for denitrification. Denitrifying bacteria are inoculated, and the nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen gas under the action of denitrifying bacteria and escape from the water body, realizing the removal of TN. Then the sewage is discharged into the high-efficiency biological reactor; S5: When the sewage enters the filter media of the high-efficiency biological reactor, it is oxidized and adsorbed by special bacteria between the filter media to remove the difficult-to-degrade organic matter in the water, and then the sewage is discharged into the filter cloth filter; S6: Sewage enters the filter through the inlet weir plate, passes through the filter cloth under the action of gravity, and the filtered water enters the central drum, and then flows into the monitoring pool from the outlet; S7: Take samples of the sewage in the monitoring pool and discharge them after they pass the test.

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