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Method for treating oil-containing waste water of lifting type membrane bioreactor system

A membrane bioreactor and bioreactor technology, applied in the field of water treatment, can solve problems such as complex structure, difficult cleaning, membrane pollution, etc., and achieve the effect of simple and stable structure and uniform heating

Inactive Publication Date: 2017-10-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for treating oily wastewater with a lift-type membrane bioreactor system, which alleviates the problems of serious membrane pollution, complex structure and difficult cleaning in the treatment of high-concentration industrial oily organic wastewater in current membrane bioreactors

Method used

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  • Method for treating oil-containing waste water of lifting type membrane bioreactor system
  • Method for treating oil-containing waste water of lifting type membrane bioreactor system
  • Method for treating oil-containing waste water of lifting type membrane bioreactor system

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Experimental program
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Effect test

Embodiment 1

[0034] The industrial refinery wastewater is treated by using the lifting membrane bioreactor system, and the change of the water quality (COD) in and out of the membrane and the change of the membrane flux during the operation of the system are measured.

[0035] Water quality indicators of industrial refinery wastewater: COD value is about 4000-5000mg / L, salinity is 2%-3%, and the type of oil is slick oil.

[0036] The operating conditions of the system are: the reactor volume is 2.8L, the PVDF microfiltration membrane is used, the transmembrane pressure is 0.2-0.3MPa, and the initial absorbance of Pseudomonas aeruginosa NY3 is OD 600 0.27, the mass ratio of the added bacteria solution to the filler is 1:5, the reactor temperature is 30-31°C, the light intensity is 2000-3000lux, the flow rate is controlled at 100-110ml / h; the water retention time is 34-36h.

[0037] Depend on image 3 It can be seen that the lifting membrane bioreactor system has a good treatment effect on ...

Embodiment 2

[0044] The petroleum wastewater was treated by a lifting membrane bioreactor system, and the change of membrane effluent quality (COD) and the change of membrane flux during system operation were measured.

[0045] Water quality indicators of petroleum wastewater: COD is 8000-12000mg / L, salinity is 3%-5%, and the oil type is emulsified oil;

[0046] The operating conditions of the system are: consistent with Embodiment 1;

[0047] Depend on image 3 It can be seen that the lifting membrane bioreactor system also has a good treatment effect on petroleum wastewater, and the COD removal rate is basically maintained above 93%. Figure 4 It can be seen that the flux of the lifting membrane module is stable and maintains 18.7L / m 2 h bar.

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Abstract

The invention provides a method for treating oil-containing waste water of a lifting type membrane bioreactor system. The method has the advantages that a double-pipe type heat exchanger is adopted to heat feeding liquid, so that the heating is uniform and the structure is simple and stable; waterborne polyurethane is adopted as an immobilized filler, so that the biocompatibility is good, and the physicochemical properties are stable; when a membrane component moves, the polyurethane flows correspondingly, so that the mass transferring efficiency can be improved, the tangential shearing force is generated for the membrane and the membrane pollution is reduced; compared with other polyurethane materials, the adopted waterborne polyurethane has better light transmission and is suitable for being used as a pseudomonas aeruginosa NY3 strain carrier; a spiral shaft of a reciprocating type lifting machine drives the membrane component to do lifting movement, so that the dynamic-layer structure of the membrane surface and the surface mass-transferring effect are greatly improved; micro-vortex and turbulent flow can be locally formed, and the centrifugal inertial effect can accelerate generation of the tangential shearing force, so that the membrane pollution in MBR can be effectively relieved; by virtue of the method, the problems of serious membrane pollution, complex structure and difficult cleaning of the existing membrane bioreactor in treating high-concentration industrial oil-containing organic waste water are relieved.

Description

(1) Technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for treating oily waste water with a lift-type membrane bioreactor system. (2) Background technology [0002] Membrane Bioreactor (MBR for short) is a new type of water treatment system formed on the basis of the original biological method of sewage treatment combined with membrane separation technology. MBR replaces the original secondary sedimentation tank with membrane modules in the biological reaction system, so that the biological reaction tank always maintains a high concentration of active sludge or bacteria during the biodegradation process, which improves the degradation efficiency and reduces the footprint of the sewage treatment facility. Also reduces the amount of sludge discharge. Membrane bioreactor has the following main advantages: high sewage treatment efficiency, good effluent quality; flexible equipment layout, high space util...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/34C02F101/32C02F103/36
CPCC02F3/1268C02F3/34C02F2101/32C02F2103/365Y02W10/10
Inventor 范铮郑伟张国亮秦磊鲁丹俞欣妍
Owner ZHEJIANG UNIV OF TECH
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