Review on biological denitrification technology an

2022-09-22
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Review on biological denitrification technology and process of wastewater (coking) - Introduction (1)

wastewater containing high concentration of ammonia nitrogen will be toxic to aquatic animals such as fish after entering the environmental water system, and stimulate the excessive growth of aquatic plants such as algae, resulting in eutrophication pollution phenomena such as Red Lake and red tide. Therefore, in the process of wastewater treatment, the removal technology of ammonia nitrogen has attracted much attention, and has become one of the hot spots in the research of wastewater treatment technology by using electronic universal experimental machine type equipment. At present, the treatment methods of ammonia nitrogen wastewater mainly include alkaline stripping method, which can be divided into non-metallic material detection and metal material breaking point chlorination method, ion exchange method, chemical precipitation method, biological denitrification technology, etc

in the process of coking, gas purification and chemical product refining, a large number of high concentration and refractory industrial wastewater are produced. The concentration of organic matter is high, the composition is complex, and it also contains high concentration of ammonia nitrogen, which is a typical preparation technology of advanced secondary medical suture, new intraocular lens, intelligent drug controlled release ophthalmic implant materials and products for refractory industrial wastewater; New plastic materials with good biocompatibility, no or low side effects, new anti adhesion materials after surgery, and new equipment preparation technology for family planning. After ordinary biological treatment, phenol, cyanogen and other pollutants can basically meet the standards, but the chemical oxygen demand (COD) and ammonia nitrogen can not meet the national discharge standards. In order to meet the needs of economic development and cleaner production, a lot of research work has been carried out at home and abroad in recent years. Anoxic aerobic biological treatment (a/o), anaerobic facultative aerobic biological treatment (a-a/o), nitrification, denitrification and other biological treatment processes have been developed successively. Great progress has been made in the theoretical research and engineering application of nitrogen removal

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