Study On Composite Iron Enzymatic Activated Sludge Technology Experiment Of Municipal Wastewater

The present state of the water pollution in China is serious, and the serious water pollution has resulted in surprising economic loss. Urban sewage treatment not only can relieve the pressure on the environment brought by water pollution, but also is one of the measures to exploit the second water source to solve urban water problem. New composite iron enzymatic activated sludge was studied, with the breakthrough point being improving biological nitrogen and phosphorus removal activated sludge floc structure. Through molysite chemical floc and microbial floc organic combination, the activated sludge flocs structure was improved and strengthened, and microbial's ability to resist the changes of environmental factors outside was increased. Through the iron ion biochemical reactions involved in microbial metabolism, the iron ion was strengthened to participate in the role of electron transfer and the role of activator enzymatic reaction to enhance the biological activity of metabolic reactions, and to improve biological nitrogen and phosphorus removal efficiency. So the inherent contradictions and bottlenecks of the sewage biological nitrogen and phosphorus removal system could be resolved fundamentally. It was to find an economic, efficient and practical municipal wastewater biological nitrogen and phosphorus removal process technology through this study of treating urban sewage which had the typical characteristics with high concentration by composite iron enzymatic activated sludge.The research results showed that:(1)In the different external environment conditions and process control, the ammonia nitrogen and organic contaminant removal rates of the chemical phosphorus removal system and the traditional biological nitrogen and phosphorus removal system were much the same. Ferric floc could enhance the effectiveness of chemical phosphorus removal, but could inhibit the effect of biological phosphorus removal. (2)At normal temperature conditions, the composite iron enzymatic system and the traditional biological nitrogen and phosphorus removal system had considerable effect of the removal of organic pollutants, the removal rate were 91.9%, 91.4%; The composite iron enzymatic system's removal of ammonia nitrogen and phophate were respectively increased 4.7% and 10.8% to the contrast system; The electron transport system activity and dehydrogenase activity of the composite iron enzymatic system were higher than the latter.(3)At low-temperature conditions, the nitrification of the composite iron enzymatic activated sludge system was significantly higher than the traditional biological nitrogen and phosphorus removal system, the two systems of ammonia nitrogen removal rates were respectively 97.3%,75.5%; the removal of organic matter were 91.7%, 90.5%; solube phosphate removal were 27.5%, 75.8%.The electron transport system activity and dehydrogenase activity of the composite iron enzymatic system were higher than latter. At normal temperature conditions, the composite iron enzymatic system remained relatively high biomass and biological activity, maintaining high nitrification efficiency.(4)The floc structure of the composite iron enzymatic activated sludge system was more compact than that of the conventional activated sludge system; The microorganism species of two systems were pediococcus, bacillus, filamentous bacteria; but there was less filamentous bacteria in composite iron enzymatic activated sludge.