External anaerobic membrane bioreactor and waste water purification technology thereof

Abstract

The invention provides an external anaerobic membrane bioreactor comprising an anaerobic tank, a tubular membrane component, tubular ultrafiltration membrane elements and a clear water tank, wherein the tubular ultrafiltration membrane elements are vertically arranged in parallel in the tubular membrane component. The invention also provides a corresponding waste water purification technology of the external anaerobic membrane bioreactor. The waste water purification technology includes the steps as follows: firstly conducting purification treatment on waste water to be treated in the anaerobic tank, collecting biogas which is generated after treatment, filtering and separating the treated waste water in sequence by a fine grating and the tubular ultrafiltration membrane elements, at last leading out the leached clear water, backwashing and chemically washing the tubular ultrafiltration membrane elements at time intervals, drip-washing the collected biogas, and then pumping the biogas together with sewage into the tubular ultrafiltration membrane elements, so that the washing effect of the inner walls of the tubular ultrafiltration membrane elements can be improved. As for the external anaerobic membrane bioreactor and the waste water purification technology thereof, the energy consumption in operation is low, the quality of effluent is good, and blockage does not happen easily.

Description

technical field [0001] The invention relates to an external anaerobic membrane bioreactor and a waste water purification process thereof. Background technique [0002] Anaerobic biological reaction is a conventional process in sewage treatment. It has the advantages of small footprint, simple process, low energy consumption, low sludge output, and can degrade some refractory organic pollutants. The biogas can be used as energy regeneration and is a treatment technology with multiple advantages of environmental and economic benefits, so it is widely used in the field of wastewater treatment, especially the wastewater treatment of higher concentrations of organic pollutants. However, the traditional anaerobic reactor has the problem of low microbial concentration caused by sludge loss. Due to the loss and quantity attenuation, it is difficult for anaerobic microorganisms to accumulate to a high concentration in the anaerobic reactor, resulting in anaerobic reactor efficiency. ...

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Problems solved by technology

However, because the submerged membrane adopts a low-speed cross-flow mode, that is, a surface flow rate of 0.2m / s (usually a stirring device is added at the bottom of the module to enhance the sludge flow), the submerged membrane has a faster membrane fouling problem, which is serious. Affects the engineering practicability of submerged membrane systems

It is also very difficult to clean the submerged membrane after it is clogged. It is often necessary to backflush the membrane group online or take out the membrane group for cleaning, which greatly increases the work intensity

The submerged membrane stack mainly includes hollow fiber membranes, which are prone to broken wires and clogging

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