A new type of anaerobic membrane electrobiological treatment process for low-strength organic wastewater

Abstract

The invention discloses a novel anaerobic membrane electrobiological treatment technology for low-strength organic wastewater. The novel anaerobic membrane electrobiological treatment technology comprises the following steps: loading a glass fiber membrane with cidified carbon nanotubes through vacuum suction filtration to prepare a microfiltering conductive membrane; with an upflow anaerobic sludge bed reactor as a main anaerobic biological treatment technology, horizontally placing a membrane bioreactor between a suspended sludge zone and a three-phase separation zone thereof to form an anaerobic-membrane integrated biological treatment technology; introducing the microfiltering conductive membrane as an electrode to form the novel anaerobic membrane electrobiological treatment technology. Regulation of parameters of a reaction device includes regulation of the hydraulic retention time, the temperature, the voltage and the like. By the novel anaerobic membrane electrobiological treatment technology, the following effects can be achieved: the conductive membrane simultaneously plays roles of membrane interception and a membrane electrode, the effluent water quality is enhanced, the methane yield is increased, membrane pollution is simultaneously relieved in situ, and the service life of the conductive membrane is prolonged. The anaerobic membrane electrobiological treatment technology has the advantages of low investment cost, small floor area, simple operation, remarkable improving effect and the like, and can be applied to treatment of low-strength organic wastewater such as urban domestic sewage.

Description

technical field [0001] The invention relates to an anaerobic biological treatment process for urban domestic sewage. Background technique [0002] Urban domestic sewage generally adopts aerobic biological treatment process, which has high power consumption. The anaerobic biological treatment technology represented by the above flow anaerobic sludge bed reactor, because of its strong impact load resistance, low energy consumption, low residual sludge output, biogas production (mainly composed of methane and carbon dioxide), and operation Convenient and other features, more and more people apply it to the treatment of urban domestic sewage. [0003] In theory, anaerobic biological treatment technology is more suitable for treating medium and high-strength organic wastewater, while the chemical oxygen demand of urban domestic sewage is generally 300-500mg / L, which belongs to low-strength organic wastewater. Therefore, in order to enhance the anaerobic biological treatment eff...

AI Technical Summary

Problems solved by technology

[0004] However, the anaerobic membrane biological treatment process has not been widely used in the actual low-intensity organic wastewater treatment, and the main reason for its limitation is the membrane fouling problem of the membrane bioreactor.

With the continuous pumping and treatment of sewage, a large number of microorganisms will be adsorbed on the surface of the separation membrane of the membrane bioreactor, resulting in a decrease in membrane pore size and a decrease in membrane flux, which in turn affects the sewage treatment effect

The traditional solution to membrane fouling is physical and chemical methods, that is, to alleviate membrane fouling through hydraulic backwashing or adding chemical reagents, but this undoubtedly increases the investment cost of the process, complicates the treatment process, and the chemical reagents added will also affect the process. Limit the growth of anaerobic microorganisms, resulting in a reduction in the treatment of organic matter in wastewater

In addition, the hydraulic retention time of anaerobic biological treatment of urban domestic sewage is generally 1 to 2 days, which is a long time, which also becomes a factor limiting the engineering application of this process

Images