Filter tank type membrane bioreactor

Abstract

A filter type membrane bioreactor comprises a biofilter, a receiving pool and a membrane module, and the biofilter is divided into a filter layer and a supporting layer; the filter layer is made from active filter material with high absorbability and biological adhesiveness and the filter material is a mixture made up of zeolite, granular activated carbon and aged refuse; the supporting layer comprises net sand cloth, a gravel layer and a porous backing plate from top to down, the grain size of the gravel layer gradually increases from top to down; the top of the biofilter is provided with a water supply pipe, on which a pump is arranged and which is connected with a pretreatment basin and provided with a weeper or connected with a sprayer; the receiving pool is arranged below the biofilter, the water pipe of the receiving pool is connected to the membrane module by the pump, a clean water pipe is connected above the membrane module, facilitating the discharge or reuse of clean water, and a backflow pipe is connected below the membrane module and connected with the water inlet of the biofilter, thus forming a cycling treatment system. The device of the invention is characterized by rich filter material sources, big filter flux, the reduction of membrane fouling and energy consumption, as well as high denitrification and dephosphorization efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a filter type membrane bioreactor for water treatment. Background technique [0002] Membrane bioreactor is a biochemical water treatment system that combines high-efficiency membrane separation technology and activated sludge bioreactor. It is considered to be one of the most promising high-tech technologies in the field of water treatment in the 21st century. Compared with the traditional sewage biochemical treatment technology, the membrane bioreactor has good solid-liquid separation effect, high biochemical efficiency and pollutant removal efficiency, low residual sludge yield, and strong shock load resistance; the system can all realize programmable control It has the advantages of centralized automatic control by PLC (PLC), flexible and stable operation control, and simple and convenient management and maintenance. [0003] The biological treat...

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Problems solved by technology

[0003] The biological treatment unit of the known membrane bioreactor mostly adopts the activated sludge method. Due to the high-efficiency interception effect of the membrane, it can maintain a high sludge concentration in the bioreactor. On the one hand, it can strengthen the removal of pollutants, but on the other hand On the one hand, it will also have a negative impact on the membrane flux, increase the viscosity of the sludge mixture, and aggravate membrane fouling.

It will lead to a continuous decrease in membrane flux, and at the same time affect the stable operation of the system, energy consumption, service life and replacement frequency of the membrane, which is directly related to the economics of the membrane bioreactor process

At present, there are many studies on the operation mode of the process in reducing membrane fouling, such as controlling the aeration rate, using a constant subcritical flux, intermittent water discharge, etc., but not much research on the bioreactor

In addition, the membrane bioreactor has a high removal rate for chemical oxygen demand (COD), but not a high removal rate for total nitrogen and total phosphorus. Black and smelly

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