Biochemical treatment system suitable for desulfurization wastewater

Abstract

The utility model discloses a biochemical treatment system suitable for desulfurization wastewater. The biochemical treatment system comprises a softening treatment unit and a biochemical treatment unit, the softening treatment unit comprises a 1 # softening reaction tank, a 2 # softening reaction tank, a 3 # softening reaction tank, a 4 # softening reaction tank, a softening sedimentation tank, a softening water outlet tank and a regulating tank; the 1 # softening reaction tank, the 2 # softening reaction tank, the 3 # softening reaction tank, the 4 # softening reaction tank, the softening sedimentation tank, the softening water outlet tank and the regulating tank are sequentially connected through process pipelines; a wastewater inlet of the 1 # softening reaction tank is connected with a desulfurization wastewater process pipeline; the 1 # softening reaction tank is connected with a NaOH dosing device through a process pipeline, and the 2 # softening reaction tank is connected with a Na2CO3 dosing device through a process pipeline. According to the system, the desulfurization wastewater can be softened, calcium and magnesium ions with relatively high hardness in the desulfurization wastewater are removed, the average value stability of inlet water of the biochemical treatment unit and effective degradation of harmful chemical substances in the wastewater are ensured, and the biochemical treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to a wastewater treatment system, in particular to a biochemical treatment system suitable for desulfurization wastewater. Background Art

[0002] Coking wastewater has complex components and high concentration of pollutants, especially high content of toxic organic matter and ammonia nitrogen, and many components (such as benzopyrene) are carcinogenic, which seriously harms the environment; especially the calcium and magnesium hardness of desulfurization wastewater is relatively large, which is easy to cause scaling of biochemical wastewater treatment system equipment without pretreatment, and the normal operation of the biochemical treatment system is affected; with the increasing shortage of water resources, the increasing cost of water use, and the continuous improvement of environmental protection standards, it is necessary to effectively treat wastewater to meet the Class A control standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002) and the special emission limit requirements of water pollutants in the "Pollutant Discharge Standard for Coking Chemical Industry" (GB16171-2012), and realize the recycling of wastewater. Therefore, it is necessary to develop a biochemical treatment system suitable for desulfurization wastewater, soften the desulfurization wastewater first, and then adjust the mean and amount of subsequent wastewater and biochemically stabilize it, so that the treated wastewater meets the current national environmental protection ultra-low emission standards. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a biochemical treatment system suitable for desulfurization wastewater with high efficiency.

[0004] In order to solve the above technical problems, the technical scheme adopted by the utility model is: comprising a softening treatment unit and a biochemical treatment unit; the softening treatment unit comprises a 1# softening reaction tank, a 2# softening reaction tank, a 3# softening reaction tank, a 4# softening reaction tank, a softening sedimentation tank, a softening effluent tank and a regulating tank; the 1# softening reaction tank, the 2# softening reaction tank, the 3# softening reaction tank, the 4# softening reaction tank, the softening sedimentation tank, the softening effluent tank and the regulating tank are connected in sequence through process pipelines; the wastewater inlet of the 1# softening reaction tank is connected to the process pipeline from the desulfurization wastewater; the 1# softening reaction tank is connected to a NaOH dosing device through a process pipeline, the 2# softening reaction tank is connected to a Na2CO3 dosing device through a process pipeline, the 3# softening reaction tank is connected to a PAC dosing device through a process pipeline, the 4# softening reaction tank is connected to a PAM dosing device through a process pipeline, and the softening sedimentation tank is connected to a sulfuric acid dosing device through a process pipeline;

[0005] The biochemical treatment unit comprises a primary anoxic tank, a primary aerobic tank, a sedimentation tank, a secondary anoxic tank, an MBR membrane tank and an MBR outlet tank; the primary anoxic tank, the primary aerobic tank, the sedimentation tank, the secondary anoxic tank, the MBR membrane tank and the MBR outlet tank are connected in sequence through process pipelines; the wastewater inlet of the primary anoxic tank is connected to the wastewater outlet of the regulating tank through a process pipeline; the primary anoxic tank is connected to a sodium phosphate dosing device through a process pipeline, the primary aerobic tank is connected to a sodium carbonate dosing device through a process pipeline, the secondary anoxic tank is connected to a sodium acetate dosing device through a process pipeline, the MBR membrane tank is connected to an MBR membrane chemical cleaning dosing device and a 2# aeration fan through a process pipeline, and the MBR outlet tank is connected to an ozone distributor through a process pipeline.

[0006] Furthermore, it also includes a sludge treatment unit; the sludge treatment unit includes a sludge thickening tank and a sludge drying device; the softened sludge outlet of the softening sedimentation tank, the residual sludge outlet of the sedimentation tank and the MBR sludge outlet of the MBR membrane tank are all connected to the sludge inlet of the sludge thickening tank through a process pipeline, and the sludge outlet of the sludge thickening tank is connected to the inlet process pipeline of the sludge drying device.

[0007] Furthermore, the biochemical treatment unit is also provided with a mixed liquor reflux pump; the reflux mixed liquor outlet of the primary aerobic tank is connected to the mixed liquor reflux pump inlet process pipeline, and the reflux liquid inlet of the primary anoxic tank is connected to the mixed liquor reflux pump outlet process pipeline.

[0008] Furthermore, the biochemical treatment unit is also provided with a sedimentation sludge return pump; the sludge return outlet of the sedimentation tank is connected to the sedimentation sludge return pump inlet process pipeline, and the return sludge inlet of the primary aerobic tank is connected to the sedimentation sludge return pump outlet process pipeline.

[0009] Furthermore, the biochemical treatment unit is also provided with an MBR sludge return pump; the sludge return outlet of the MBR membrane tank is connected to the MBR sludge return pump inlet process pipeline, and the sludge return inlet of the secondary anoxic tank is connected to the MBR sludge return pump outlet process pipeline.

[0010] The beneficial effects of adopting the above technical solution are:

[0011] The utility model firstly performs a softening treatment on the desulfurization wastewater to remove the calcium and magnesium ions with relatively large hardness in the desulfurization wastewater, thereby solving the problem that the calcium and magnesium ions scale the equipment of the subsequent biochemical wastewater treatment unit and affect the biochemical treatment effect; after the desulfurization wastewater is softened, the mean and amount of the subsequent wastewater are adjusted and the biochemical high-efficiency treatment is performed, thereby ensuring the mean stability of the water inlet of the biochemical treatment unit and laying a foundation for the effective degradation of harmful chemicals in the wastewater by biochemical treatment.

[0012] The utility model can soften desulfurization wastewater, remove calcium and magnesium ions with high hardness in desulfurization wastewater, solve the problem that calcium and magnesium ions scale the equipment of the subsequent biochemical wastewater treatment unit and affect the biochemical treatment effect. After the desulfurization wastewater is softened, the mean and amount of the subsequent wastewater are adjusted and the biochemical high-efficiency treatment is carried out, so as to ensure the mean stability of the influent of the biochemical treatment unit and the effective degradation of harmful chemicals in the wastewater, and improve the biochemical treatment effect. The high-efficiency biochemical treatment unit adopts the wastewater treatment process of coupling AOA biochemical treatment with MBR membrane biological treatment, so that the treated wastewater meets the first-level A control standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002) and the special discharge limit requirements of water pollutants in the "Pollutant Discharge Standard for Coking Chemical Industry" (GB16171-2012), and realizes the recycling of desulfurization wastewater that meets the standards; the residual sludge after wastewater treatment is concentrated and dried and mixed with coking coal to realize the resource reuse of solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] In the figure: 1# softening reaction tank 1, 2# softening reaction tank 2, 3# softening reaction tank 3, 4# softening reaction tank 4, softening sedimentation tank 5, softening effluent tank 6, regulating tank 7, primary anoxic tank 8, primary aerobic tank 9, sedimentation tank 10, secondary anoxic tank 11, MBR membrane tank 12, MBR effluent tank 13, sludge concentration tank 14, sludge drying device 15, NaOH dosing device 16, Na2CO3 dosing device 17, PAC dosing device 18, PAM dosing device 19, sulfuric acid dosing device 20, sodium phosphate Dosing device 21, sodium carbonate dosing device 22, sodium acetate dosing device 23, MBR membrane chemical cleaning dosing device 24, ozone distributor 25, softening sludge pump 26, softening effluent pump 27, equalization tank effluent pump 28, mixed liquor reflux pump 29, sedimentation sludge reflux pump 30, residual sludge pump 31, MBR sludge reflux pump 32, MBR sludge efflux pump 33, MBR effluent self-priming pump 34, MBR membrane chemical cleaning dosing pump 35, MBR effluent pump 36, 1# aeration fan 37, 2# aeration fan 38. DETAILED DESCRIPTION

[0016] Figure 1As shown, the biochemical treatment system for desulfurization wastewater is composed of a softening treatment unit, a biochemical treatment unit, and a sludge treatment unit. The softening treatment unit is composed of a 1# softening reaction tank 1, a 2# softening reaction tank 2, a 3# softening reaction tank 3, a 4# softening reaction tank 4, a softening sedimentation tank 5, a softening effluent tank 6, an adjusting tank 7, a NaOH dosing device 16, a Na2CO3 dosing device 17, a PAC dosing device 18, a PAM dosing device 19, a sulfuric acid dosing device 20, a softening effluent pump 27, and an adjusting tank effluent pump 28; the biochemical treatment unit is composed of a primary anoxic tank 8, a primary aerobic tank 9, a sedimentation tank 10, a secondary anoxic tank 11, an MBR membrane tank 12, an MBR effluent tank 13, a phosphorus The sludge treatment unit is composed of a sludge thickening tank 14, a sludge drying device 15, a softening sludge pump 26, a residual sludge pump 31, and an MBR sludge discharge pump 33.

[0017] Figure 1As shown, the softening treatment unit of the biochemical treatment system for desulfurized wastewater is as follows: the wastewater inlet of the 1# softening reaction tank 1 is connected to the process pipeline from the desulfurized wastewater, and the dosing inlet of the softening reaction tank 1 is connected to the outlet process pipeline of the NaOH dosing device 16; the wastewater outlet of the 1# softening reaction tank 1 is connected to the wastewater inlet process pipeline of the 2# softening reaction tank 2, and the dosing inlet of the 2# softening reaction tank 2 is connected to the outlet process pipeline of the Na2CO3 dosing device 17; the wastewater outlet of the 2# softening reaction tank 2 is connected to the wastewater inlet process pipeline of the 3# softening reaction tank 3, and the dosing inlet of the 3# softening reaction tank 3 is connected to the outlet process pipeline of the PAC dosing device 18; the wastewater outlet of the 3# softening reaction tank 3 is connected to the wastewater inlet process pipeline of the 4# softening reaction tank 4, and the dosing inlet of the 4# softening reaction tank 4 is connected to the outlet process pipeline of the PAM dosing device 19. The wastewater outlet of 4# softening reaction tank 4 is connected to the wastewater inlet process pipeline of softening sedimentation tank 5, and the dosing inlet of softening sedimentation tank 5 is connected to the outlet process pipeline of sulfuric acid dosing device 20; the wastewater outlet of softening sedimentation tank 5 is connected to the wastewater inlet process pipeline of softening effluent tank 6, and the wastewater sludge outlet of softening sedimentation tank 5 is connected to the inlet process pipeline of softening sludge pump 26; the outlet of softening sludge pump 26 is connected to the sludge inlet process pipeline of sludge thickening tank 14; the wastewater outlet of softening effluent tank 6 is connected to the inlet process pipeline of softening effluent pump 27, and the outlet of softening effluent pump 27 is connected to the wastewater inlet process pipeline of regulating tank 7, and the wastewater inlet of regulating tank 7 is connected to the wastewater pipeline from coal gasification process and microcrystalline adsorption process; the wastewater outlet of regulating tank 7 is connected to the wastewater inlet process pipeline of regulating tank effluent pump 28.

[0018] Figure 1As shown, the biochemical treatment system for desulfurized wastewater is applicable to the biochemical treatment unit: the wastewater inlet of the primary anoxic tank 8 is connected to the wastewater outlet process pipeline of the regulating tank outlet pump 28, the dosing inlet of the primary anoxic tank 8 is connected to the outlet process pipeline of the sodium phosphate dosing device 21, the reflux liquid inlet of the primary anoxic tank 8 is connected to the outlet process pipeline of the mixed liquid reflux pump 29, the wastewater outlet of the primary anoxic tank 8 is connected to the wastewater inlet process pipeline of the primary aerobic tank 9; the bottom aeration device of the primary aerobic tank 9 is connected to the air outlet process pipeline of the 1# aeration fan 37, the dosing inlet of the primary aerobic tank 9 is connected to the outlet process pipeline of the sodium carbonate dosing device 22 The outlet of the primary aerobic tank 9 is connected to the inlet process pipeline of the mixed liquor reflux pump 29, the outlet of the mixed liquor reflux pump 29 is connected to the inlet process pipeline of the reflux liquid of the primary anoxic tank 8, the reflux sludge inlet of the primary aerobic tank 9 is connected to the outlet process pipeline of the sedimentation sludge reflux pump 30, the wastewater outlet of the primary aerobic tank 9 is connected to the wastewater inlet process pipeline of the sedimentation tank 10; the sludge reflux outlet of the sedimentation tank 10 is connected to the inlet process pipeline of the sedimentation sludge reflux pump 30, the residual sludge outlet of the sedimentation tank 10 is connected to the inlet process pipeline of the residual sludge pump 31, the wastewater outlet of the sedimentation tank 10 is connected to The wastewater inlet process pipeline of the secondary anoxic tank 11 is connected; the dosing inlet of the secondary anoxic tank 11 is connected to the outlet process pipeline of the sodium acetate dosing device 23, the sludge return inlet of the secondary anoxic tank 11 is connected to the outlet process pipeline of the MBR sludge return pump 32, and the wastewater outlet of the secondary anoxic tank 11 is connected to the wastewater inlet process pipeline of the MBR membrane tank 12; the inlet of the bottom aeration device of the MBR membrane tank 12 is connected to the air outlet process pipeline of the 2# aeration fan 38, the sludge return outlet of the MBR membrane tank 12 is connected to the inlet process pipeline of the MBR sludge return pump 32, and the residual sludge outlet of the MBR membrane tank 12 is connected to the MB The inlet process pipeline of the R sludge efflux pump 33 is connected, the cleaning liquid inlet of the MBR membrane pool 12 is connected to the outlet process pipeline of the MBR membrane chemical cleaning and dosing pump 35, the inlet of the MBR membrane chemical cleaning and dosing pump 35 is connected to the outlet process pipeline of the MBR membrane chemical cleaning and dosing device 24, the wastewater outlet of the MBR membrane pool 12 is connected to the wastewater inlet process pipeline of the MBR outlet pool 13 through the MBR outlet water self-priming pump 34; the odor inlet of the MBR outlet pool 13 is connected to the outlet process pipeline of the ozone distributor 25, and the biochemical treatment wastewater of the MBR outlet pool 13 is transported and sent out through the MBR outlet water pump 36 for recycling.

[0019] Figure 1As shown, the sludge treatment unit of the biochemical treatment system suitable for desulfurization wastewater: the softened sludge outlet of the softening sedimentation tank 5 is connected to the sludge inlet process pipeline of the sludge thickening tank 14 through the inlet and outlet of the softening sludge pump 26; the residual sludge outlet of the sedimentation tank 10 is connected to the sludge inlet process pipeline of the sludge thickening tank 14 through the inlet and outlet of the residual sludge pump 31; the MBR sludge of the MBR membrane tank 12 is connected to the sludge inlet process pipeline of the sludge thickening tank 14 through the inlet and outlet of the MBR sludge efflux pump 33; the sludge outlet of the sludge thickening tank 14 is connected to the inlet process pipeline of the sludge drying device 15, and the dried sludge treated by the sludge drying device 15 is mixed with the coking blend coal.

[0020] Figure 1 As shown, the process flow of the biochemical treatment system for desulfurization wastewater is as follows:

[0021] The desulfurized wastewater passes through 1# softening reaction tank 1, 2# softening reaction tank 2, 3# softening reaction tank 3, 4# softening reaction tank 4 and softening sedimentation tank 5. According to the sludge settling ratio in the softening sedimentation tank 5 and whether the supernatant of the effluent after the wastewater is softened is clear, the sludge at the bottom of the softening sedimentation tank 5 is discharged to the sludge thickening tank 14 and the sludge drying device 15 through the softening sludge pump 26, and then coking coal is added. After the wastewater is softened, the supernatant with a total hardness of less than 100 mg / L enters the softening effluent tank 6, and then the softening effluent pump 27 enters the regulating tank 7, and the mean and amount are adjusted with the wastewater from the coal gasification process and the microcrystalline adsorption process wastewater to ensure the stable operation of the subsequent biochemical treatment unit. Among them, the 1# softening reaction tank 1 is dosing a 10% sodium hydroxide solution through a NaOH dosing device 16 to adjust the pH to 11-11.5; the 2# softening reaction tank 2 is dosing a 10% sodium carbonate solution through a Na2CO3 dosing device 17 to adjust the pH to 11-11.5; the 3# softening reaction tank 3 is dosing a 10% PAC solution through a PAC dosing device 18; the 4# softening reaction tank 4 is dosing a 0.1% PAM solution through a PAM dosing device 19; the softening sedimentation tank 5 is dosing a 10% sulfuric acid through a sulfuric acid dosing device 20 to adjust the effluent pH to 8-9, and the sludge concentration in the tank is controlled at 20-30 g / L.

[0022] The wastewater is regulated by the mean value and quantity of the regulating tank 7 to provide a stable water source for the subsequent biochemical treatment system. The wastewater after homogenization and quantity regulation is transported to the primary anoxic tank 8 by the regulating tank outlet pump 28, and mixed with the mixed liquid reflux from the primary aerobic tank 9 pumped by the mixed liquid reflux pump 29 in the inlet channel of the primary anoxic tank 8, and then enters the anoxic reaction tank of the primary anoxic tank 8, where denitrification occurs to denitrify, nitrate nitrogen is converted into nitrogen gas, and organic matter is removed as an electron donor; at the same time, through denitrification enhancement, a part of the difficult-to-degrade organic matter is converted and degraded under nitrate oxidation. Sodium phosphate is transported to the primary anoxic tank 8 through the sodium phosphate dosing device 21 to provide nutrients in the denitrification process.

[0023] The effluent of the primary anoxic tank 8 flows by gravity into the primary aerobic tank 9, and is mixed with the return sludge of the sedimentation tank 10 pumped by the sedimentation sludge return pump 30, and oxygen is provided by bubbling through the 1# aeration fan 37, and the sodium carbonate dosing device 22 provides sodium carbonate, and most of the organic matter is degraded and the nitrification of ammonia nitrogen is completed in the carbonization section and the nitrification section respectively. After the effluent of the primary aerobic tank 9 passes through the sedimentation tank 10, the supernatant of the sedimentation tank 10 flows by gravity to the secondary anoxic tank 11 to further remove pollutants in the wastewater, and the residual sludge at the bottom of the sedimentation tank 10 is transported to the sludge concentration tank 14 and the sludge drying device 15 through the residual sludge pump 31, and then coking coal is added. The effluent of the secondary anoxic tank 11 enters the MBR membrane tank 12, and the pollutants in the effluent can be removed through the operating characteristics of the membrane module. At the same time, it can replace the secondary sedimentation tank to achieve a better mud-water separation effect, so that the effluent of the MBR membrane tank 12 meets the standards and is transported to the MBR effluent tank 13 through the MBR effluent self-priming pump 34. The MBR has a high sludge concentration, and oxygen is provided by bubbling through the 2# aeration fan 38, which can effectively maintain an aerobic state. At the same time, part of the sludge is returned to the secondary anoxic tank 11 through the MBR sludge return pump 32, and the remaining sludge enters the sludge thickening tank 14 and the sludge drying device 15 through the MBR sludge external discharge pump 33 for concentration and dehydration and is added to the coking coal.

[0024] According to the characteristics of wastewater quality, an appropriate amount of ozone delivered by the ozone distributor 25 is introduced into the outlet of the MBR outlet tank 13 to achieve continuous stability of the COD of the effluent from the MBR outlet tank 13, effectively solve the increase of COD caused by reducing substances, ensure that the effluent from the MBR outlet tank 13 meets the direct discharge standard, and is transported and discharged by the MBR outlet pump 36.

[0025] An embodiment of the biochemical treatment system applicable to desulfurization wastewater is as follows:

[0026] 1. Desulfurization wastewater softening treatment unit:

[0027] 1# softening reaction tank 1 uses a rectangular structure with a length of 1600mm, a width of 1600mm, and a height of 3500mm; 1# softening reaction tank agitator uses BLD11-23-2.2kw carbon steel lined plastic material vertical agitator, with a speed of 40-60rpm, variable frequency motor YVP100L1-4, power 2.2KW, protection grade IP55, and anti-corrosion grade WF1.

[0028] 2# softening reaction tank 2 uses a rectangular structure with a length of 1600mm, a width of 1600mm, and a height of 3500mm; 2# softening reaction tank agitator uses BLD11-23-2.2kw carbon steel lined plastic material vertical agitator, speed 40 ~ 60rpm, variable frequency motor YVP100L1-4, power 2.2KW, protection level IP55, anti-corrosion level WF1.

[0029] 3# softening reaction tank 3 uses a rectangular structure with a length of 900mm, a width of 900mm, and a height of 3500mm; the agitator of 3# softening reaction tank uses a carbon steel lined plastic material vertical agitator BLED121-153-0.75kw, a speed of 5-10rpm, a variable frequency motor YVP802-4, a power of 0.75KW, a protection level of IP55, and an anti-corrosion level of WF1.

[0030] 4# softening reaction tank 4 uses a rectangular structure with a length of 900mm, a width of 900mm, and a height of 3500mm; the agitator of 4# softening reaction tank uses a BLD11-29-1.5kw carbon steel lined plastic material vertical agitator, a speed of 5-10rpm, a variable frequency motor YVP90L-4, a power of 1.5KW, a protection level of IP55, and an anti-corrosion level of WF1.

[0031] The softening sedimentation tank 5 uses a rectangular structure with a length of 2300mm, a width of 2300mm and a height of 6000mm; the softening sedimentation tank 5 scraper uses a central drive scraper: R47-68.54-Y0.55-4P-M1-270 degrees, carbon steel lined with plastic material, peripheral transmission speed 1.5~2 frequency adjustable, frequency conversion motor YVP801-4, power 0.55KW, protection level: IP55, anti-corrosion level WF1.

[0032] The softening water outlet pool 6 is a rectangular parallelepiped structure with a length of 2300mm, a width of 2300mm and a height of 6000mm;

[0033] The regulating tank 7 uses a rectangular structure with a length of 12000mm, a width of 8000mm and a height of 5800mm. The regulating tank 7 uses a submersible agitator QJB1.5 / 6-260 / 3-980 / S for stirring, the material is S22053, the motor model is M150, the power is 1.5KW, the stirring speed is 480rpm, and the protection level is IP68.

[0034] The NaOH dosing device 16 uses two storage tanks with a diameter of 1500mm, a height of 1800mm, a material of PE, and a volume of 3m 3 , a tank for storing 30% sodium hydroxide solution; two mechanical diaphragm metering pumps made of UPVC are used as the metering pumps, the conveying medium is 30% sodium hydroxide solution, the flow rate is 0-500L / h, and the head is 50m; the stroke adjustment range of the metering pump (manual) is 10%-110%, and the adjustment accuracy is ±1%. The sodium hydroxide delivery pump uses a horizontal centrifugal pump with a flow rate of 20m 3 / h, lift 15m, motor model YE3-112M-2, power 4KW, protection level: IP55.

[0035] The Na2CO3 dosing device 17 uses specifications of 4500*3200*2250mm. Two storage tanks are used, with a diameter of 1600mm, a height of 2500mm, a material of PE, and a volume of 5m 3 , store sodium carbonate solids and configure them into 10% sodium carbonate solution; the metering pumps are 2 mechanical diaphragm metering pumps made of UPVC material, the conveying medium is 10% sodium carbonate, the flow rate is 500-800L / h, the head is 50m, the metering pump stroke adjustment range (manual) is 10%-110%, and the adjustment accuracy is ±1%.

[0036] The PAC dosing device 18 uses specifications of 1900*1100*1150mm. Two storage tanks are used, with a diameter of 1000mm, a height of 1000mm, a material of PE, and a volume of 0.5m 3 , store PAC solids and configure them into 10% PAC solution; the metering pumps are 2 mechanical diaphragm metering pumps made of UPVC material, the conveying medium is 10% sodium carbonate, the flow rate is 0-100L / h, the head is 50m, the metering pump stroke adjustment range (manual) is 10%-110%, and the adjustment accuracy is ±1%.

[0037] The PAM dosing device 19 uses specifications of 3000*1670*1860mm. The drug storage tank uses a 2000mm long, 1220mm wide, 1120mm high, and made of 304 material. The storage medium is anionic PAM solid, which is configured as 0.01% PAM solution, and is equipped with 2 agitators; the metering pump is made of UPVC material; the conveying medium is 0.01% PAM, the flow rate is 0-110L / h, the head is 40m, and the metering pump stroke adjustment range (manual) is 10%-110%, and the adjustment accuracy is ±1%.

[0038] The sulfuric acid dosing device 20 uses the specification of 4000*300*2200mm. The drug storage tanks use 2 sets of 1500mm diameter, 1800mm high, PE material, and 3m3 capacity. 3 ; The conveying medium is 75% sulfuric acid solution; the metering pumps are 2 mechanical diaphragm metering pumps made of UPVC material; the conveying medium is 75% sulfuric acid solution, the flow rate is 0~500L / h, the head is 50m; the stroke adjustment range of the metering pump (manual) is 10%~110%, and the adjustment accuracy is ±1%.

[0039] The softening water pump 27 is a horizontal self-priming centrifugal pump with a flow rate of 20m 3 / h, lift 25m, motor model YE3-132S1-2, power 7.5KW, protection grade: IP55.

[0040] Regulating tank outlet pump 28 Use horizontal self-priming centrifugal pump with a flow rate of 50m 3 / h, lift 30m, motor model YE3-160M1-2, power 15KW, protection level: IP55.

[0041] 2. Desulfurization wastewater biochemical treatment unit:

[0042] The first-level anoxic pool 8 uses a rectangular structure with a length of 10000mm, a width of 7700 and a height of 7500mm; the first-level anoxic pool 8 agitator uses a submersible agitator of model QJB1.5 / 8-400 / 3-740 / S; the stirring motor uses material S22053; including: guide rod, model M150, power 1.5KW, stirring speed 740rpm, protection level IP68.

[0043] The first-level aerobic pool 9 uses a rectangular structure with a length of 17000mm, a width of 10000 and a height of 6500mm;

[0044] Sedimentation tank 10 uses a rectangular structure with a length of 10000mm, a width of 10000 and a height of 6000mm; the sedimentation tank 10 scraper uses a carbon steel lined with plastic material, model R87-20.66-Y0.75-4P-M1-270 degree central drive scraper, peripheral drive speed 1.5~2 frequency adjustable, frequency conversion motor YVP802-4, power 0.75KW, protection level IP55, anti-corrosion level WF1.

[0045] The secondary anoxic pool 11 uses a rectangular structure with a length of 10000mm, a width of 4500 and a height of 6500mm; the secondary anoxic pool 11 agitator uses a QJB1.5 / 6-260 / 3-980 / S submersible agitator, a stirring motor model of M150, a power of 1.5KW, a stirring speed of 980rpm, and a protection level of IP68.

[0046] The MBR membrane pool 12 uses a rectangular structure with a length of 10000mm, a width of 5000 and a height of 6000mm; the MBR membrane bioreactor uses a treatment scale of 50m 3 / h, operating flexibility of 70-115%, PVDF flat membrane; each set of components contains 400 membranes, 1.5m 2 / piece; average flux 600~900L / m 2 .d. Pore diameter 0.1μm.

[0047] The MBR outlet pool 13 uses a rectangular structure with a length of 10000mm, a width of 2500 and a height of 5500mm;

[0048] The sodium phosphate dosing device 21 uses specifications of 1700*1900*1170mm. Two storage tanks with a diameter of 1000mm, a height of 1000mm, a material of PE, and a volume of 0.55m³ are used to store sodium phosphate solids to form a 10% sodium phosphate solution; the metering pumps use two mechanical diaphragm metering pumps made of UPVC material, with a conveying medium of 10% sodium phosphate, a flow rate of 0~50L / h, a head of 50m, and a metering pump stroke adjustment range (manual) of 10%~110%, and an adjustment accuracy of ±1%.

[0049] The sodium carbonate dosing device 22 uses specifications of 4500*3200*2250mm. Two storage tanks are used, with a diameter of 1600mm, a height of 2500mm, a material of PE, and a volume of 5m 3 , store sodium carbonate solids and configure them into 10% sodium carbonate solution; the metering pumps are 2 UPVC mechanical diaphragm metering pumps, the conveying medium is 10% sodium phosphate, the flow rate is 500-800L / h, the head is 50m, the metering pump stroke adjustment range (manual) is 10%-110%, and the adjustment accuracy is ±1%.

[0050] The sodium acetate dosing device 23 uses a specification of 4000*3000*2200mm. Two storage tanks are used, with a diameter of 1500mm, a height of 1800mm, a material of PE, and a volume of 3m 3 , store sodium acetate solid and configure it into 10% sodium acetate solution; the metering pumps are 2 UPVC mechanical diaphragm metering pumps, the conveying medium is 10% sodium acetate, the flow rate is 0-500L / h, the head is 50m, the metering pump stroke adjustment range (manual) is 10%-110%, and the adjustment accuracy is ±1%.

[0051] The MBR membrane chemical cleaning and dosing device 24 uses a specification of 3800*3600*2250mm. The drug storage tank uses a diameter of 1600mm, a height of 2500mm, a material of PE, and a volume of 5m 3 , storing citric acid solution or 10% sodium chlorate solution. (1) For cleaning organic pollutants, a sodium hypochlorite complete dosing device with a specification of 2600*1900*1300mm is selected, made of PE, and the storage medium is 10% sodium hypochlorite solution; the sodium hypochlorite metering pump uses a mechanical diaphragm metering pump, the conveying medium is 10% sodium hypochlorite, the flow rate is 0~200L / h, the head is 15m, the metering pump stroke adjustment range (manual) is 10%~110%, and the adjustment accuracy is ±1%. (2) For cleaning inorganic pollutants, a citric acid complete dosing device with a specification of 2600*1900*1300mm is selected, made of PE, and the storage medium is citric acid solution; the citric acid metering pump uses a mechanical diaphragm metering pump, the conveying medium is citric acid, the flow rate is 0~200L / h, the head is 15m, the metering pump stroke adjustment range (manual) is 10%~110%, and the adjustment accuracy is ±1%.

[0052] The MBR membrane chemical cleaning and dosing pump 35 uses two UPVC vertical centrifugal pumps, with the conveying medium being citric acid solution or sub-10% sodium chlorate solution, with a flow rate of 0-2000L / h and a head of 30m.

[0053] Mixed liquid reflux pump 29 uses a horizontal centrifugal pump with a flow rate of 150m 3 / h, lift 20m, motor YE3-200L1-2, power 30KW.

[0054] The sedimentation sludge return pump 30 uses a horizontal self-priming centrifugal pump with a flow rate of 50m 3 / h, lift 30m, motor YE3-160M1-2, power 11KW.

[0055] MBR sludge return pump 32 uses a horizontal screw pump with a flow rate of 50m 3 / h, lift 35m, motor 160L-4, power 15KW.

[0056] MBR outlet water self-priming pump 34 uses a horizontal self-priming centrifugal pump with a flow rate of 63m 3 / h, lift 15m, motor YE3-132S2-2, power 7.5KW.

[0057] MBR outlet pump 36 uses a horizontal self-priming centrifugal pump with a flow rate of 50m 3 / h, lift 30m, motor YE3-160M1-2, power 11KW.

[0058] 1# aeration fan 37 uses a single-stage centrifugal air suspension blower with an air volume of 16Nm 3 / min, outlet pressure 78kPa, equipped with variable frequency motor 22KW.

[0059] 2# aeration fan 38 uses a single-stage centrifugal blower with an air volume of 1152Nm 3 / h, outlet pressure 65KPa, motor selected is YVF-280S-2-75KW.

[0060] 3. Desulfurization wastewater sludge treatment unit:

[0061] The sludge thickening tank 14 is a rectangular structure with a length of 3300 mm, a width of 2000 mm and a height of 5200 mm.

[0062] The sludge drying device 15 uses a belt filter press and a hollow blade dryer to dry the sludge, and is equipped with a water film dust collector. The belt filter press uses a DSNYA1000 belt thickening filter press with a bandwidth of 1m and Q=5~15m 3 / h, N=1.5kw+0.75kw; the hollow blade dryer uses KJG-70 hollow blade dryer.

[0063] Softening sludge pump 26 uses horizontal screw pump with flow rate of 5m 3 / h, lift 35m, motor ZR02-2.2-4-B5 / 100L1-4B5, power 2.2KW.

[0064] The residual sludge pump 31 uses a horizontal self-priming centrifugal pump with a flow rate of 50m 3 / h, lift 30m, motor YE3-160M1-2, power 11KW.

[0065] MBR sludge effluent pump 33 uses a horizontal screw pump with a flow rate of 50m 3 / h, lift 35m, motor 160L-4, power 15KW.

Claims

1. A biochemical treatment system suitable for desulfurization wastewater, characterized in that: It comprises a softening treatment unit and a biochemical treatment unit; the softening treatment unit comprises a 1# softening reaction tank (1), a 2# softening reaction tank (2), a 3# softening reaction tank (3), a 4# softening reaction tank (4), a softening sedimentation tank (5), a softening effluent tank (6) and a regulating tank (7); the 1# softening reaction tank (1), the 2# softening reaction tank (2), the 3# softening reaction tank (3), the 4# softening reaction tank (4), the softening sedimentation tank (5), the softening effluent tank (6) and the regulating tank (7) are connected in sequence through process pipelines; the 1# softening reaction tank (1), the 2# softening reaction tank (2), the 3# softening reaction tank (3), the 4# softening reaction tank (4), the softening sedimentation tank (5), the softening effluent tank (6) and the regulating tank (7) are connected in sequence through process pipelines; the 1# softening reaction tank (1) The wastewater inlet of the reaction tank (1) is connected to a process pipeline from desulfurization wastewater; the 1# softening reaction tank (1) is connected to a NaOH dosing device (16) via a process pipeline, the 2# softening reaction tank (2) is connected to a Na2CO3 dosing device (17) via a process pipeline, the 3# softening reaction tank (3) is connected to a PAC dosing device (18) via a process pipeline, the 4# softening reaction tank (4) is connected to a PAM dosing device (19) via a process pipeline, and the softening sedimentation tank (5) is connected to a sulfuric acid dosing device (20) via a process pipeline; The biochemical treatment unit comprises a primary anoxic tank (8), a primary aerobic tank (9), a sedimentation tank (10), a secondary anoxic tank (11), an MBR membrane tank (12) and an MBR outlet tank (13); the primary anoxic tank (8), the primary aerobic tank (9), the sedimentation tank (10), the secondary anoxic tank (11), the MBR membrane tank (12) and the MBR outlet tank (13) are connected in sequence through process pipelines; the wastewater inlet of the primary anoxic tank (8) and the wastewater outlet of the regulating tank (7) are connected through process pipelines. The primary anoxic tank (8) is connected to a sodium phosphate dosing device (21) via a process pipeline; the primary aerobic tank (9) is connected to a sodium carbonate dosing device (22) via a process pipeline; the secondary anoxic tank (11) is connected to a sodium acetate dosing device (23) via a process pipeline; the MBR membrane tank (12) is connected to an MBR membrane chemical cleaning dosing device (24) and a No. 2 aeration fan (38) via a process pipeline; and the MBR outlet tank (13) is connected to an ozone distributor (25) via a process pipeline.

2. A biochemical treatment system for desulfurization wastewater according to claim 1, characterized in that: It also includes a sludge treatment unit; the sludge treatment unit includes a sludge thickening tank (14) and a sludge drying device (15); the softened sludge outlet of the softening sedimentation tank (5), the residual sludge outlet of the sedimentation tank (10) and the MBR sludge outlet of the MBR membrane tank (12) are all connected to the sludge inlet of the sludge thickening tank (14) through a process pipeline, and the sludge outlet of the sludge thickening tank (14) is connected to the inlet process pipeline of the sludge drying device (15).

3. A biochemical treatment system for desulfurization wastewater according to claim 1, characterized in that: The biochemical treatment unit is also provided with a mixed liquor reflux pump (29); the reflux mixed liquor outlet of the primary aerobic tank (9) is connected to the inlet process pipeline of the mixed liquor reflux pump (29), and the reflux liquid inlet of the primary anoxic tank (8) is connected to the outlet process pipeline of the mixed liquor reflux pump (29).

4. A biochemical treatment system for desulfurization wastewater according to claim 1, characterized in that: The biochemical treatment unit is also provided with a sedimentation sludge return pump (30); the sludge return outlet of the sedimentation tank (10) is connected to the inlet process pipeline of the sedimentation sludge return pump (30), and the return sludge inlet of the primary aerobic tank (9) is connected to the outlet process pipeline of the sedimentation sludge return pump (30).

5. A biochemical treatment system for desulfurization wastewater according to any one of claims 1 to 4, characterized in that: The biochemical treatment unit is also provided with an MBR sludge return pump (32); the sludge return outlet of the MBR membrane tank (12) is connected to the inlet process pipeline of the MBR sludge return pump (32), and the sludge return inlet of the secondary anoxic tank (11) is connected to the outlet process pipeline of the MBR sludge return pump (32).

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