Membrane bioreactor device synergistically regulated by utilizing iron-based water treatment material

A membrane bioreactor and reactor technology, applied in water/sewage treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of limited effect of enhanced bioflocculation and complex biofilm pollution process, etc. Achieve the effects of reducing membrane fouling potential, high biocompatibility, and improving effluent quality

Pending Publication Date: 2020-02-04
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of biofilm fouling caused by refractory organic matter in influent water is very complicated. If only relying on the enhanced bioflocculation effect of coagulant is limited, how to build a membrane fouling control system with synergistic effect is an urgent problem to be solved at present.

Method used

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  • Membrane bioreactor device synergistically regulated by utilizing iron-based water treatment material
  • Membrane bioreactor device synergistically regulated by utilizing iron-based water treatment material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The membrane material of the ultrafiltration membrane module in the device is polyvinylidene fluoride, the retention capacity of the membrane is 5kDa, and the membrane flux is 10L / m 2 h, the working and stopping time of the membrane were 12min and 3min respectively; the dosage of potassium ferrate was 0.01mmol / L. The operating conditions of the membrane bioreactor device: the hydraulic retention time is 12h, the sludge retention time is 30d, the air-water ratio is 20:1, the total iron content of the biopolymer iron solution is 85g / L, and the dosage is 0.04mmol / L.

[0023] The raw water is chemical wastewater, the chemical oxygen demand (COD) of the raw water is 5720-6524mg / L, and the biochemical oxygen demand (BOD 5 ) is 472-563mg / L. attached by figure 2 It can be seen that, compared with the control reactor, the membrane fouling rate of the device of the present invention is reduced by 83%, and the production rate of activated sludge is reduced by 42%. ...

Embodiment 2

[0024] Example 2: The membrane material of the ultrafiltration membrane module in the device is polyvinylidene fluoride, the retention capacity of the membrane is 5kDa, and the membrane flux is 8.6L / m 2 h, the working and stopping time of the membrane are 12min and 3min respectively; the dosage of potassium ferrate is 0.02mmol / L. The operating conditions of the membrane bioreactor device: the hydraulic retention time is 14h, the sludge retention time is 30d, the air-water ratio is 20:1, the total iron content of the biopolymer iron solution is 93g / L, and the dosage is 0.05mmol / L.

[0025] Raw water is pharmaceutical wastewater, COD is 7540~7985mg / L, BOD 5 It is 366~428mg / L. attached by figure 2 It can be seen that, compared with the control reactor, the membrane fouling rate of the device of the present invention is reduced by 87%, and the production rate of activated sludge is reduced by 43%. The effluent of the device fully meets the secondary discharge standard of the ...

Embodiment 3

[0026] Example 3: The membrane material of the ultrafiltration membrane module in the device is polyvinylidene fluoride, the retention capacity of the membrane is 5kDa, and the membrane flux is 7.5L / m 2 h, the working and stopping time of the membrane were 12min and 3min respectively; the dosage of potassium ferrate was 0.03mmol / L. The operating conditions of the membrane bioreactor device: the hydraulic retention time is 16h, the sludge retention time is 30d, the air-water ratio is 20:1, the total iron content of the biopolymer iron solution is 97g / L, and the dosage is 0.06mmol / L.

[0027] Raw water is wastewater containing anionic surfactant, COD is 11870~14470mg / L, BOD 5 It is 675~869mg / L. attached by figure 2 It can be seen that, compared with the control reactor, the membrane fouling rate of the device of the present invention is reduced by 93%, and the production rate of activated sludge is reduced by 49%. The effluent of the device fully meets the secondary discharge...

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Abstract

The invention discloses a membrane bioreactor device synergistically regulated by an iron-based water treatment material. The device is structurally characterized in that an ultrafiltration membrane assembly is arranged in a reactor, treated water enters an effluent water tank through a water outlet pump, and the water outlet pump is connected with a time relay to control the operation or stop ofthe water outlet pump. The reactor is provided with a perforated aeration pipe which is connected with an aeration pump. A liquid level contact is arranged at the upper part of the reactor and is connected with a liquid level meter to control the turn-on of a water inlet pump, and the water inlet pump is connected with a raw water tank. A ferrate solution tank is connected with a dosing pump, a medicament enters a pre-oxidation reactor through the dosing pump, and a mechanical stirrer is arranged in the pre-oxidation reactor. A bio-polymeric ferric sulfate dosing pump is arranged at the lowerpart of the reactor and is connected to a bio-polymeric ferric sulfate solution tank. Advanced oxidation and biological flocculation technologies are combined together, so that the problem of biological membrane pollution caused by refractory organic matters can be effectively relieved. The membrane pollution potential of the wastewater can be remarkably reduced, the sludge yield can be effectively reduced by the residual high-valence iron, and the quality of effluent water is improved.

Description

technical field [0001] The invention belongs to the technical field of reclaimed water reuse, and in particular relates to a membrane bioreactor device that utilizes water treatment materials for coordinated control. Background technique [0002] With the development of industry, the world is facing a very severe environmental situation, and the environmental problems caused by refractory organic matter in wastewater are particularly prominent. Refractory wastewater can easily cause water pollution, lead to deterioration of the ecological environment, endanger human health and hinder the development of related industries. Refractory wastewater is usually discharged from pharmaceutical, printing and dyeing, chemical, petroleum and other industries. It has the characteristics of refractory biodegradation, long-lasting environmental hazards, complex treatment process, and high investment and operation costs. According to the pollutant removal mechanism, refractory wastewater t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/5236C02F1/72C02F3/1268C02F9/00C02F2101/30
Inventor 张海丰刘赫尊王胜利张兰河关晓辉孙旭辉
Owner NORTHEAST DIANLI UNIVERSITY
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