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Apparatus and method for removing phosphor and organic matter in sewage water with electric flocculation membrane bioreactor

A membrane bioreactor, electro-flocculation technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sewage treatment, etc., can solve the problems of low phosphorus removal efficiency, increase sludge activity, reduce sludge viscosity, etc. , to reduce costs, delay the occurrence of membrane fouling, and achieve the effect of automatic control

Inactive Publication Date: 2008-09-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiency of low phosphorus removal efficiency of existing membrane bioreactors, the present invention provides a device and method for electrocoagulation membrane bioreactors. The addition of electrocoagulation can increase sludge activity to a certain extent, reduce sludge viscosity, The average particle size of the sludge and the concentration of organic matter in the supernatant of the mixed liquid delay the occurrence of membrane fouling to a certain extent, enabling the reactor to operate stably for a long period of time

Method used

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  • Apparatus and method for removing phosphor and organic matter in sewage water with electric flocculation membrane bioreactor

Examples

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Effect test

Embodiment 1

[0030] Example 1: Under the condition that the sludge concentration in the membrane bioreactor tank is about 6g / L, and the hydraulic retention time is 11h, three sets of electrode plates are arranged in parallel, the distance between the electrode plates is 3.0cm, and the anode is made of iron plate. DC voltage, current density is 40A / m 2 , when the total phosphorus content in the influent is 5.0mg / L, the COD concentration is 300mg / L, and the ammonia nitrogen is 50mg / L, the removal rates of COD and ammonia nitrogen in the effluent of the membrane bioreactor are above 90% and 95% respectively. After 24 hours of electrolysis, the electrode plate is powered off, and the total phosphorus content of the effluent can be kept below 0.5mg / L for 5 days, and the flocs produced are discharged together with the sludge from the membrane bioreactor.

Embodiment 2

[0031] Example 2: Under the condition that the sludge concentration in the membrane bioreactor tank is about 6g / L and the hydraulic retention time is 11h, a group of electrode plates are arranged in parallel, the distance between the electrode plates is 2.0cm, and the anode is made of iron plate. DC voltage, current density is 20A / m 2 , when the total phosphorus content in the influent is 5.0mg / L, the COD concentration is 300mg / L, and the ammonia nitrogen is 50mg / L, the removal rates of COD and ammonia nitrogen in the effluent of the membrane bioreactor are above 90% and 95% respectively. After 48 hours of electrolysis, the electrode plate is powered off, and the total phosphorus content of the effluent can be kept below 0.5mg / L for 3 days, and the flocs produced are discharged together with the sludge from the membrane bioreactor.

Embodiment 3

[0032] Embodiment 3: Membrane flux is 9L / (m in membrane bioreactor 2 .h), the sludge concentration in the reactor is about 6g / L, and the hydraulic retention time is 11h. Two sets of electrode plates are arranged in parallel. The distance between the electrode plates is 1.0cm. The anode is made of aluminum plate. The density is 80A / m 2 , when the total phosphorus content in the influent is 5.0mg / L, the COD concentration is 300mg / L, and the ammonia nitrogen is 50mg / L, the removal rates of COD and ammonia nitrogen in the effluent of the membrane bioreactor are above 90% and 95% respectively. After 24 hours of electrolysis, the electrode plate is powered off, and the total phosphorus content of the effluent can be kept below 0.5mg / L for 7 days, and the flocs produced are discharged together with the sludge from the membrane bioreactor.

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Abstract

The invention relates to a device and a method which are used for removing phosphor and organic matter in an electric flocculation film bioreactor, and belongs to the wastewater treatment field. The device uses the combination technology of the electric flocculation and the film bioreactor, that is, an iron plate or an aluminium plate is adopted to be used as an anode electrode, a plate electrode is electrolyzed to generate iron ions or aluminium ions which are combined with hydroxyl ions and phosphate radical ions in wastewater to form a flocculation body. The organic matter is degraded by microorganism in the film bioreactor to form mud, and the contamination is removed by the filtering of a micro filter membrane component, thereby the purpose of removing the phosphor and the organic matter from the wastewater is achieved. The device has the advantages of simple structure, no chemical agent put, simple operation and management, easy realization of automatic control, as well as good and stable yielding water quality, and is particularly suitable for departments, organizations, schools, building sites and subdistricts in areas lacking of water; the yielding water can be directly used as gray water, reuse water and landscape water.

Description

technical field [0001] The invention relates to a device and method for sewage treatment, in particular to a method and system for removing phosphorus and organic matter in sewage by using electrocoagulation combined with a membrane bioreactor, and belongs to the technical field of sewage treatment. Background technique [0002] Membrane bioreactor is a sewage treatment and reuse process that combines membrane separation technology and biological treatment unit. Because the process adopts efficient membrane separation to replace the secondary sedimentation tank in the traditional activated sludge process, the solid-liquid separation efficiency is high, the effluent is good and stable, and can be reused directly; the reactor can maintain a high concentration of microbial biomass and handle volume load High, low floor space; small amount of excess sludge; convenient operation and management, high degree of automation. Membrane bioreactor has become a research hotspot at home ...

Claims

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Application Information

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IPC IPC(8): C02F1/463C02F3/12C02F3/10
CPCY02W10/10
Inventor 黄霞崔志广夏俊林李舒渊
Owner TSINGHUA UNIV
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