Method for treating sludge digestive liquid by coupling anaerobic ammonia oxidation and anaerobic methane oxidation

Abstract

The invention provides a method for treating sludge digestive liquid by coupling anaerobic ammonia oxidation and anaerobic methane oxidation, and belongs to the technical field of wastewater treatment. The method comprises the steps that anaerobic digested sludge is inoculated into an anaerobic methanogenic reactor, partial nitrification sludge is inoculated into a partial nitrification reactor, and anaerobic ammonia oxidation and denitrification-type methane anaerobic oxidation bacterium symbiotic bacterium group sludge is inoculated into an anaerobic ammonia oxidation coupled anaerobic methane oxidation reactor; firstly the sludge digestive liquid enters the anaerobic methanogenic reactor, after water quality of yielding water is adjusted by a middle water tank, the yielding water enters the partial nitrification reactor, and the nitrosation process is realized by controlling aeration time; finally the water quality of yielding water is adjusted by the middle water tank, the yielding water enters the anaerobic ammonia oxidation coupled anaerobic methane oxidation reactor, meanwhile, methane generated by the anaerobic methanogenic reactor is used for aeration, and the autotrophic nitrogen removal process is completed with the help of anaerobic ammonia oxidation bacteria and anaerobic methane oxidation bacteria. The method can be used for solving the problems of insufficient organic carbon source, relatively low C / N ratio, release of greenhouse gases and the like existing in a sludge digestive liquid nitrogen removal treatment process.

Description

technical field [0001] The invention relates to a method for treating sludge digestion liquid through anaerobic ammonium oxidation coupled with anaerobic methane oxidation, belonging to the technical field of sewage treatment. Background technique [0002] During the secondary biochemical treatment of urban sewage, microorganisms proliferate while degrading organic matter, and finally enter the sludge system. In order to achieve the purpose of sludge reduction, stabilization and energy recovery, excess sludge and primary sludge are usually treated anaerobically in the sludge digester, and about 50% of the organic matter is removed through methane production during the digestion process, while A large amount of organic nitrogen is converted into NH by ammoniation 4 + -N, and transferred to the sludge digestate, so that the NH of the sludge digestate 4 + The -N concentration is as high as 500-1300mg / L, but the COD concentration is usually only about 1000mg / L. Therefore, t...

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Problems solved by technology

[0005] Since the main gaseous product of the anaerobic digestion process is methane, methane in the gas phase is easily collected as an energy source, but methane in the liquid phase is difficult to recover

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