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Efficient heterogeneous photo-Fenton and membrane bioreactor coupling process

A membrane bioreactor and reactor technology, applied in the field of water treatment, can solve the problems of membrane fouling, increase operating cost, and reduce biological decomposition efficiency, and achieve the effects of improving treatment efficiency, reducing operating pressure, and improving catalytic effect.

Pending Publication Date: 2020-09-29
YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when MBR technology treats high-concentration organic wastewater, there are still problems such as low microbial decomposition efficiency and serious membrane fouling, which hinder its wide application in industrial wastewater treatment.
[0004] The coupling of homogeneous Fenton and membrane bioreactor to treat high-concentration organic wastewater solves the difficult problem to a certain extent, but a large amount of iron sludge is produced after the homogeneous Fenton reaction, causing secondary pollution, and the catalyst cannot Recycling and reuse increases operating costs
A large amount of its catalyst enters the membrane bioreactor system, and long-term operation will reduce the efficiency of biological decomposition and greatly accelerate membrane fouling

Method used

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  • Efficient heterogeneous photo-Fenton and membrane bioreactor coupling process
  • Efficient heterogeneous photo-Fenton and membrane bioreactor coupling process
  • Efficient heterogeneous photo-Fenton and membrane bioreactor coupling process

Examples

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Effect test

Embodiment 1

[0039]A new coupling process of heterogeneous photo-Fenton and membrane bioreactor was used to treat printing and dyeing wastewater, and the COD of the photo-Fenton reactor and membrane bioreactor effluent and the change of membrane flux with time were measured. The operating conditions of the photo-Fenton reactor: 5000ml of high-concentration printing and dyeing wastewater, adding 1.8g of catalyst, ultraviolet light for 2h, and recycling the catalyst ten times. The operating conditions of the membrane bioreactor: adopt intermittent pumping mode, pump for 8 minutes, stop for 2 minutes, hydraulic retention time 24 hours, reactor volume 40L, PVDF microfiltration membrane, transmembrane pressure difference between 0.04MPa, sludge concentration between About 5000mg / L. image 3 Photo-Fenton catalysts prepared by activated carbon, clay, zeolite, and titanium dioxide as supporting materials were used to remove COD from printing and dyeing wastewater by photo-Fenton. The results showe...

Embodiment 2

[0041] A new coupling process of heterogeneous photo-Fenton and membrane bioreactor was used to treat leather wastewater, and the COD of the effluent from photo-Fenton reactor and membrane bioreactor was determined. The operating conditions of the photo-Fenton reactor: 5000ml of high-concentration leather wastewater, adding 1.8g of catalyst, UV light for 2h, and recycling the catalyst ten times. The operating conditions of the membrane bioreactor: adopt intermittent pumping mode, pump for 8 minutes, stop for 2 minutes, hydraulic retention time 24 hours, reactor volume 40L, PSF ultrafiltration membrane, transmembrane pressure difference between 0.04, sludge concentration 5000mg / L or so. Depend on Figure 7 It can be seen that the COD removal rate of the photo-Fenton process remains at about 50%, and the coupling system uses ultrafiltration membranes instead of microfiltration membranes, and the COD removal rate reaches from about 90% to more than 97%.

[0042] Only the membr...

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Abstract

The invention discloses an efficient heterogeneous photo-Fenton and membrane bioreactor coupling process. The process comprises the following steps: (1) pretreating an inorganic porous material; (2) preparing a photo-Fenton catalyst; (3) carrying out photo-Fenton treatment on the high-concentration organic wastewater; (4) recycling the photo-Fenton catalyst; and (5) operation of the membrane bioreactor. The process is based on the difference between heterogeneous photo-Fenton and the treatment effect of the membrane bioreactor on substances in the high-concentration organic wastewater and hascharacteristics with complementary effects so as to have the advantage of having the following advantages: refractory substances are removed before the membrane bioreacto, the toxicity of wastewater to activated sludge is reduced, and recycling of a catalyst is guaranteed, the wastewater treatment efficiency is improved, membrane pollution is reduced, and the service life of a membrane is prolonged so that the problems that a traditional membrane bioreactor is low in high-concentration organic wastewater treatment efficiency, serious in membrane pollution and short in membrane service life aresolved.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a high-efficiency heterogeneous photo-Fenton and membrane bioreactor coupling process. Background technique [0002] The homogeneous Fenton not only has harsh reaction conditions, but also has the disadvantage that the Fenton reagent is difficult to separate and recover, and needs to add a large amount of acid and alkali to adjust the pH value in the wastewater, which increases the operating cost. After the reaction, a large amount of iron sludge that is difficult to handle is produced, causing secondary pollution. Heterogeneous photo-Fenton is an emerging technology for the treatment of high-concentration organic wastewater in response to the problem that the Fenton reagent in homogeneous Fenton cannot be recycled. Its reaction pH range is wide, and it avoids adding a large amount of acid and alkali to adjust the pH in wastewater. , At the same time, no iron sludge is prod...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/001C02F1/32C02F1/722C02F1/725C02F3/1268C02F7/00C02F9/00C02F2101/30C02F2305/026
Inventor 冯小义刘义吴晓峰楼旭军秦磊
Owner YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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