Anaerobic denitrification and methane removal device and method and sewage treatment system and method

Abstract

An anaerobic denitrification and methane removal device and method, and a sewage treatment system and method are provided. The anaerobic denitrification and methane removal device comprises: an anaerobic reactor in which anaerobic ammonia oxidation sludge and denitrification type anaerobic methane nitrification sludge are inoculated; and a water inlet pump, which is communicated with the anaerobic reactor and is used for conveying sewage containing methane, ammonia nitrogen and nitrite nitrogen into the anaerobic reactor, wherein ammonia nitrogen and nitrite nitrogen in the sewage are converted into nitrogen and nitrate nitrogen under the action of the anaerobic ammonia oxidation sludge, the nitrite nitrogen and the nitrate nitrogen generated by anaerobic ammonia oxidation are converted into nitrogen under the action of the denitrification type anaerobic methane oxidation sludge, and methane is removed under the action of the denitrification type anaerobic methane oxidation sludge. The invention also provides an anaerobic denitrification and methane removal method, a sewage treatment system and a sewage treatment method. The problem that high-ammonia-nitrogen sewage cannot be effectively treated is solved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an anaerobic denitrification and methane removal device and method, a sewage treatment system and method. Background technique [0002] With the progress of society, the development of urbanization and industrialization is getting faster and faster, while the living standards of the people are improving, the discharge of sewage is also increasing. Among them, high-ammonia-nitrogen sewage such as livestock and poultry breeding sewage, landfill leachate, sludge digestate, leather sewage, and coking sewage has large discharge volume, high ammonia nitrogen concentration, and high difficulty in treatment. cause serious environmental problems. Therefore, high ammonia nitrogen sewage treatment technology has always been the focus of water treatment at home and abroad. At present, the mainstream treatment technology for high-ammonia nitrogen wastewater, which uses the front-en...

AI Technical Summary

Problems solved by technology

At present, the mainstream treatment technology for high-ammonia nitrogen wastewater, which uses the front-end anaerobic fermentation to produce methane combined with the back-end traditional nitrification and denitrification as the core process, has some deficiencies that lead to the inability to effectively treat high-ammonia nitrogen wastewater. These deficiencies mainly include the following indivual:

[0003] (1) Due to the treatment of the methane production stage and the aerobic stage of the anaerobic fermentation at the front end, most of the organic matter in the sewage is removed, resulting in the low effective carbon source that can be used by denitrifying bacteria at the back end, and the denitrification cannot be fully carried out. As a result, the concentration of total nitrogen in the process effluent is high, and the denitrification effect is poor;

[0004] (2) Because the traditional nitrification and denitrification denitrification process requires a large amount of aeration to realize the conversion and removal of ammonia nitrogen in the nitrification stage, resulting in high energy consumption and operating costs of the process;

[0005] (3) Because methane has a certain solubility in water, the methane dissolved in the effluent after the anaerobic methanogenesis stage will be released in the subsequent processing units, resulting in higher greenhouse gas emissions from the process;

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