Coupling membrane biological treatment reactor for toxic high-nitrogen-content chemical industry sewage

Abstract

The invention relates to a coupling membrane biological treatment process and a reactor for toxic high-nitrogen-content chemical industry sewage. According to the present invention, by using the coupling membrane biological treatment process and the reactor, sewage is treated sequentially through a biological selection pool, a suspended filler oxidation pool, an aerobic activity sludge pool, an anoxic activity sludge pool and a membrane pool to obtain the effluent meeting the discharge standard; the process and the reactor have characteristics of high removal efficiency and strong impact resistance, and the COD, the ammonia nitrogen and the total nitrogen in the effluent can stably achieve the standards; no oxidant and catalyst are used, the operation cost is low, and no secondary pollution is generated; the reactor is an integrated structure so as to save the occupation area and reduce the energy consumption required for the reflux of the mixed liquid and the sludge, such that the engineering investment is low; and the process and the reactor has advantages of simple processing flow, convenient operation, convenient maintenance and the like, and can be used in the industrial production of toxic high-nitrogen-content chemical industry sewage.

Description

technical field

[0001] The invention belongs to the field of sewage treatment, and in particular relates to a coupled membrane biological treatment reactor for toxic and high nitrogen-containing chemical sewage. Background technique

[0002] With the release of industry standards such as "Petrochemical Industry Pollutant Discharge Standard" GB 31571-2015 and "Coking Chemical Industry Pollutant Discharge Standard" GB16171-2012, strict ammonia nitrogen and total nitrogen control limits have been put forward for chemical wastewater discharge. Nitrogen is one of the main elements in chemical raw materials or products. Most chemical sewage contains nitrogen in different forms. Therefore, chemical enterprises are faced with upgrading and transforming sewage treatment facilities to improve the removal rate of ammonia nitrogen and increase the total nitrogen. treatment facility. Most of the standard upgrades are to add secondary biochemical treatment facilities with denitrification...

Examples

Embodiment 1

[0052] A wet-process acrylic fiber production sewage, the treatment capacity is 150m 3 / h, water quality after neutralization and coagulation air flotation to remove suspended solids: COD: 1000mg / L, total nitrogen: 115mg / L, ammonia nitrogen: 15mg / L, acrylonitrile: 80mg / L, sodium thiocyanate: 100mg / L.

[0053] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0054] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were inoculated and acclimatized with sludge for 2 to 4 weeks respectively, and the acrylic fiber wastewater entered biological selection tank, suspended packing oxidation tank, aerobic Activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0055] The biological selection tank is used ...

Embodiment 2

[0065] An acrylonitrile plant produces sewage with a treatment capacity of 50m 3 / h, the influent water quality is COD:

[0066] 3500mg / L, total nitrogen: 280mg / L, ammonia nitrogen: 80mg / L, NO 3 - -N: 12 mg / l, acrylonitrile: 100 mg / L, pyridines: 600 mg / L.

[0067] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0068] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were respectively inoculated and domesticated with sludge for 2 to 4 weeks, and the acrylonitrile sewage entered the biological selection tank, suspended packing oxidation tank, good Oxygen activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0069] The biological selection tank is used as a hydrolysis and acidification tank. T...

Embodiment 3

[0079] A coking waste water with a treatment capacity of 100m 3 / h, after dephenolization, ammonia distillation, decyanation and pre-recovery of phenol sodium salt, liquid ammonia and cyanide, the sewage water quality is COD: 3000mg / L, ammonia nitrogen: 300mg / L, phenol: 300mg / L, cyanide: less than 20mg / L.

[0080] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0081] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were inoculated and acclimatized with sludge for 2 to 4 weeks respectively, and the acrylic fiber wastewater entered biological selection tank, suspended packing oxidation tank, aerobic Activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0082] The biological selection tank is u...

technical field

[0001] The invention belongs to the field of sewage treatment, and in particular relates to a coupled membrane biological treatment reactor for toxic and high nitrogen-containing chemical sewage. Background technique

[0002] With the release of industry standards such as "Petrochemical Industry Pollutant Discharge Standard" GB 31571-2015 and "Coking Chemical Industry Pollutant Discharge Standard" GB16171-2012, strict ammonia nitrogen and total nitrogen control limits have been put forward for chemical wastewater discharge. Nitrogen is one of the main elements in chemical raw materials or products. Most chemical sewage contains nitrogen in different forms. Therefore, chemical enterprises are faced with upgrading and transforming sewage treatment facilities to improve the removal rate of ammonia nitrogen and increase the total nitrogen. treatment facility. Most of the standard upgrades are to add secondary biochemical treatment facilities with denitrification...

Examples

Embodiment 1

[0052] A wet-process acrylic fiber production sewage, the treatment capacity is 150m 3 / h, water quality after neutralization and coagulation air flotation to remove suspended solids: COD: 1000mg / L, total nitrogen: 115mg / L, ammonia nitrogen: 15mg / L, acrylonitrile: 80mg / L, sodium thiocyanate: 100mg / L.

[0053] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0054] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were inoculated and acclimatized with sludge for 2 to 4 weeks respectively, and the acrylic fiber wastewater entered biological selection tank, suspended packing oxidation tank, aerobic Activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0055] The biological selection tank is used ...

Embodiment 2

[0065] An acrylonitrile plant produces sewage with a treatment capacity of 50m 3 / h, the influent water quality is COD:

[0066] 3500mg / L, total nitrogen: 280mg / L, ammonia nitrogen: 80mg / L, NO 3 - -N: 12 mg / l, acrylonitrile: 100 mg / L, pyridines: 600 mg / L.

[0067] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0068] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were respectively inoculated and domesticated with sludge for 2 to 4 weeks, and the acrylonitrile sewage entered the biological selection tank, suspended packing oxidation tank, good Oxygen activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0069] The biological selection tank is used as a hydrolysis and acidification tank. T...

Embodiment 3

[0079] A coking waste water with a treatment capacity of 100m 3 / h, after dephenolization, ammonia distillation, decyanation and pre-recovery of phenol sodium salt, liquid ammonia and cyanide, the sewage water quality is COD: 3000mg / L, ammonia nitrogen: 300mg / L, phenol: 300mg / L, cyanide: less than 20mg / L.

[0080] The treatment process and reactor structure are as follows figure 1 As shown, the coupled membrane bioreactor (CCMBR) used is a reinforced concrete structure.

[0081] Suspended packing oxidation tank, aerobic activated sludge tank, anoxic activated sludge tank and membrane tank were inoculated and acclimatized with sludge for 2 to 4 weeks respectively, and the acrylic fiber wastewater entered biological selection tank, suspended packing oxidation tank, aerobic Activated sludge tank, anoxic activated sludge tank and membrane tank, the final effluent is pumped from the ultrafiltration membrane module of the membrane tank.

[0082] The biological selection tank is u...

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