Efficiency improving method for biochar addition-based anaerobic membrane bioreactor

Abstract

The invention relates to an efficiency improving method for a biochar addition-based anaerobic membrane bioreactor. The method comprises the following steps: 1, preparing walnut shell biochar; 2, adding the walnut shell biochar prepared in step 1 into an anaerobic membrane bioreactor which is successfully started, and taking another reactor which is not added with the walnut shell biochar as a control group; and 3, operating the reactor, operating the reactor for one cycle when the HRT is 30 d, then increasing the organic load, enabling the reactor to operate for one cycle when the HRT is 20 d, and regularly measuring various indexes in the reactor. Free syntrophic flora in a biochar enrichment fermentation system is utilized, and oxygen-containing functional groups on the surface of the biochar are utilized to excite direct electron transfer between interspecies of syntrophic methanogens, so that the kitchen waste treatment efficiency of the anaerobic membrane bioreactor is improved. At the same time, the adsorption conversion effect of the biochar on free macromolecules reduces the potential of the biochar on the membrane pollution and plugging effect, and the scouring effect of the biochar on the membrane during aeration also reduces the membrane pollution rate.

Description

technical field [0001] The invention relates to the field of waste energy recovery, in particular to a method for synergizing anaerobic membrane bioreactors based on biochar addition. Background technique [0002] Food waste is an important part of urban organic waste, and its carbohydrate, protein, fat and salt content is relatively high, so it has a high recycling value. The anaerobic fermentation technology can recycle the organic matter in the kitchen waste, convert it into usable energy substances, and use these energy substances to generate electricity and realize zero energy consumption in the treatment process. When anaerobic technology is used to treat food waste, since the main components of food waste are easily biodegradable carbohydrates and fatty substances, under high-load conditions, the acidification speed is too fast, causing excessive accumulation of organic acids and other problems, inhibiting anaerobic The activity of microorganisms leads to the reducti...

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Problems solved by technology

[0004] In order to improve the problems of low treatment efficiency of anaerobic membrane bioreactors under high organic loading conditions, easy pollution of membrane modules, and poor system stability, the present invention provides a synergistic effect of anaerobic membrane bioreactors based on biochar addition Method, with the help of the huge specific surface area and porous structure of biochar to enrich the free mutualistic flora in the fermentation system, the oxygen-containing functional groups on the surface of biochar may stimulate the direct transfer of electrons between mutualistic methanogens, thereby improving the efficiency of anaerobic membranes. At the same time, the enrichment and conversion of biochar to macromolecules will weaken its fouling potential on the membrane, and in the process of aeration, the scouring effect of biochar on the membrane surface will also Reduce membrane fouling rate

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