Wuhan Qianzishan Garbage Treatment Plant believes that China is a big livestock and poultry breeding country, producing about 38108t livestock and poultry manure every year, of which 40% has not been effectively treated and utilized. With the continuous improvement of the intensification of livestock and poultry breeding, the concentrated discharge of a large number of wastes has brought severe challenges to the surrounding environment. Anaerobic digestion technology can be harmless, quantitative treatment of organic waste, control environmental pollution, energy recovery, has been widely used in livestock waste treatment.

Wuhan Qianzishan Waste Treatment PlantthinkChina is a large livestock and poultry breeding country, which produces about38108t livestock and poultry manure, of which 40% has not been effectively treated and utilized. With the continuous improvement of the intensification of livestock and poultry breeding, the concentrated discharge of a large number of wastes has brought severe challenges to the surrounding environment. Anaerobic digestion technology can be harmless, quantitative treatment of organic waste, control environmental pollution, energy recovery, has been widely used in livestock waste treatment.

Wuhan Qianzishan Waste Treatment PlantthinkStable operation of anaerobic digestion vulnerable to chemical(such as ammonia nitrogen, volatile fatty acids, H2S, etc.) concentration) accumulation in microbial metabolism. Among them, on the one hand, ammonia nitrogen provides an important nitrogen source for the growth and reproduction of anaerobic microorganisms, and provides partial alkalinity for the anaerobic digestion system; on the other hand, when ammonia nitrogen exceeds a certain concentration, it will have a strong suppression effect on microorganisms., Resulting in less or no gas production, that is, ammonia nitrogensuppression. Ammonia nitrogen has become typical of microbial activitysuppressionagent.

Wuhan Qianzishan Waste Treatment PlantthinkAt home and abroad on the anaerobic digestion of ammonia nitrogensuppressionA lot of research work has been done. Early research mainly focused on anaerobic digestion and reduction of excess sludge, but due to different sources and types of sludge, ammonia nitrogensuppressionThe problem is not universal. Livestock and poultry waste contains a large number of nitrogen-containing organic matter, in the process of anaerobic digestion gradually reduced to explain the release of ammonia nitrogen, thereby increasing the ammonia nitrogensuppressionThe potential risks of ammonia nitrogen are greatly promoted.suppressionresearch progress. Therefore, this study takes the anaerobic digestion of livestock and poultry waste as the object, from the source andsuppressionThreshold,suppressionThe mechanism, influencing factors and countermeasures of three aspects of the summary of the relevant research at home and abroad in recent years, and focus on the analysis of the concentration of ammonia nitrogen on the anaerobic microbial community structure, in order to prevent, alleviate and eliminate ammonia nitrogen.suppressionProvide basis and reference.

Wuhan Qianzishan Waste Treatment PlantthinkLivestock and poultry waste is mainly manure, urine and washing water, in addition to a small amount of dead livestock and fodder residue. All kinds of waste are rich in nitrogen. Taking pigs as an example, the total amount of crude protein in pig manure accounts for the dry weight of manure.17.3, only pig urine ammonia nitrogen concentration is as high as 2173mgL-1, 13.2 percent of the dead pigs are protein. China's large-scale livestock and poultry breeding is mainly pigs, cattle and chickens, which produce a large proportion of waste. Table 1 lists some physical and chemical indexes of these three kinds of livestock and poultry manure. As can be seen from Table 1, KKN is rich in pig manure, cow manure and chicken manure. The TKN content in chicken manure is nearly twice that of pig manure or cow manure, but the C/N ratio between them is very different. These nitrogen-containing organic compounds include urea, uric acid, allantoin, and the like. In urine, under the biochemical action of anaerobic microorganisms, hydrolytic acidification bacteria will gradually degrade macromolecular nitrogen-containing organic matter, mainly protein, and release ammonia nitrogen.