Wastewater treatment process of flat membrane bioreactor and reverse osmosis comprehensive membrane integrated system

Abstract

The invention discloses a wastewater treatment process of a flat membrane bioreactor and reverse osmosis comprehensive membrane integrated system, which comprises the following steps of: carrying out aerobic biochemical treatment or anoxic and aerobic combined biochemical treatment on pretreated textile wastewater; then charging the wastewater into a membrane bioreactor adopting a flat type polyvinylidene fluoride membrane module for treating; and carrying out reverse osmosis treatment on the produced water of the membrane bioreactor by a brackish water reverse osmosis membrane. The treated water obtained after treating the textile wastewater by the invention has the total hardness of lower than 0.2ppmas CaCO3 and the conductivity of 10-200uS / cm. The produced water meets the recycling requirement on factory water and can be used as industrial water. The process solves the problems of special substance, higher-dissolubility solid concentration, organic matter concentration, large chemical component fluctuation, and the like in textile wastewater, the treated water quality is stable and reliable, and the operations of membrane cleaning, and the like are simple and easy.

Description

Technical field [0001] The invention belongs to the field of waste water recycling and reuse systems, and specifically relates to a waste water treatment process of an integrated membrane integrated system using a submerged PVDF flat membrane biofilm reactor (MBR) and reverse osmosis (RO). Background technique [0002] The textile industry is one of the fastest growing industries in my country. However, the textile industry is also one of the main sources of pollution in my country's industrial system. In 2004 alone, the total discharge of wastewater from the textile industry reached 1.4 billion cubic meters. [0003] In my country's Guangdong, Jiangsu and Zhejiang provinces where the textile industry is relatively concentrated, environmental problems and water resources are becoming more and more severe. my country is gradually strengthening the management of drainage standards, and the textile industry is facing the problem of wastewater discharge and reaching wastewater dischar...

AI Technical Summary

Problems solved by technology

[0006] 1) Traditional biological treatment is difficult to remove substances that are difficult to biodegrade, such as: some softeners, detergents for surfactants, etc.

This makes it difficult for the final treated water to meet the discharge standards

[0007] 2) The higher concentration of dissolved solids limits the growth of microorganisms, leading to a decrease in the sedimentation of microorganisms, causing floating mud in the treated water, which brings difficulties to the subsequent treatment

[0008] 3) In the traditional biological treatment tank, the concentration of sludge (MLSS) is lower than 4000mg / L, so the capacity of biological treatment is low, and a larger volume of reaction tank is required

[0009] 4) The organic matter concentration and chemical composition of textile wastewater fluctuate greatly

Therefore, traditional biological treatment has a greater impact on sludge load and chemical composition

[0010] 5) The output of traditional biological treatment of excess sludge is large, and excess sludge also needs to be landfilled

[0011] 6) When chlorine oxidation reaction is used for decolorization, dissolved available chlorine reacts with organic matter in water, which may lead to the generation of organic chlorine compounds

[0012] Therefore, the hollow fiber membrane bioreactor process is used in the prior art, but due to the problem of broken filaments of the hollow fiber, the treated water quality is unstable

Moreover, the hollow fiber membrane needs to be cleaned off-line, which is complicated and inconvenient to use.

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