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A New Method to Control Membrane Fouling in Membrane-Bioreactor

A bioreactor, biofilm technology, applied in chemical instruments and methods, biological water/sewage treatment, sustainable biological treatment, etc. Energy consumption, mitigation of membrane fouling, effect of optimizing membrane fouling situation

Inactive Publication Date: 2011-12-14
PACIFIC WATER TREATMENT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the long-term operation of the membrane-bioreactor, it will inevitably lead to membrane fouling, which limits the further promotion and application of the membrane-bioreactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Two sets of membrane-bioreactors treat the same urban domestic sewage, the designed hydraulic retention time is 8 hours, and the sludge age is 90 days. The membrane components are made of polyvinylidene fluoride (PVDF) flat membranes, the membrane pore size is 0.20 μm, and the membrane flux is constant at 25L / (h·m 2 ); wherein the experimental group added fillers, the fillers were honeycomb plastic fillers, and the amount of fillers added was 5% of the reactor volume, and the other group was used as a control group. The operation results show that the membrane cleaning cycle of the experimental group is 120d, and the energy consumption is 0.51kwh / m 3 , the membrane cleaning period of the blank group is 50d, and the energy consumption is 0.55kwh / m 3 .

Embodiment 2

[0020] Two sets of membrane-bioreactors treat the same industrial wastewater, the design hydraulic retention time is 10h, the sludge age is 120d, the membrane module is made of flat polyvinyl chloride (PVC) membrane, the membrane pore size is 0.25μm, and the membrane flux is constant at 15L / (h·m 2 ); wherein the experimental group added fillers, the fillers were corrugated plate hard polyvinyl chloride fillers, and the amount of fillers added was 10% of the reactor volume, and the other group was used as a control group. The operation results show that the membrane cleaning cycle of the experimental group is 87 days, and the energy consumption is 0.53kwh / m 3 , the membrane cleaning period of the blank group is 35d, and the energy consumption is 0.59kwh / m 3 .

Embodiment 3

[0022] Two sets of membrane-bioreactors treat the same fecal sewage, the design hydraulic retention time is 8h, the sludge age is 90d, the membrane module is made of polyvinylidene fluoride (PVDF) flat membrane, the membrane pore size is 0.20μm, and the membrane flux is constant at 20L / (h·m 2 ); wherein the experimental group added fillers, the fillers were soft fibrous fillers, and the amount of fillers added was 5% of the reactor volume, and the other group was used as a control group. The operation results show that the membrane cleaning cycle of the experimental group is 100d, and the energy consumption is 0.51kwh / m 3 , the membrane cleaning period of the blank group is 45d, and the energy consumption is 0.56kwh / m 3 .

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Abstract

A new method for controlling membrane fouling in a membrane-bioreactor relates to a technology for controlling fouling of a membrane component in a membrane-bioreactor, and is suitable for treating water and waste water by a membrane-bioreactor. The invention forms a dual system of biofilm method and membrane-bioreactor by adding a certain amount of filler in the reactor as the carrier of the biofilm, thereby reducing the pollution rate of the surface of the membrane module; at the same time, the optimized aeration method can By controlling the metabolism of microorganisms to further slow down membrane fouling and reduce energy consumption. The method of the present invention does not require structural modification of the original membrane-bioreactor, only needs to add a certain amount of filler, and the method of the present invention can further reduce energy consumption, and is suitable for membrane-bioreactions in the form of various membrane modules It has strong practicability, wide application range, low operating cost, and convenient operation and management. The invention integrates the biofilm method and the membrane-bioreactor efficiently, and has an optimized aeration mode, can well control membrane pollution, reduce energy consumption, and realize long-term stable operation of the membrane-bioreactor.

Description

technical field [0001] The invention belongs to the technical field of water and waste water treatment, and in particular relates to a new method for controlling membrane component pollution. Background technique [0002] Membrane-bioreactor (MBR) process is a new type of water and wastewater biological treatment technology that combines modern membrane separation technology and biotechnology. Retention, replacing the traditional secondary sedimentation tank, greatly increases the concentration of activated sludge (biomass) in the biochemical reaction tank; realizes separate control of hydraulic retention time (HRT) and sludge retention time (SRT), and refractory sludge Macromolecular organic substances are trapped in the reaction pool to continuously react and degrade. The treatment efficiency of the bioreactor is greatly improved by the membrane separation technology. Compared with the traditional biological treatment process, it has high biochemical efficiency, strong im...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 何磊梅晓洁于鸿光韩小蒙秦爱东冯金荣邓伯林张效刚刘青友达云祥
Owner PACIFIC WATER TREATMENT ENG
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