Study On Municipal Wastewater Treatment Technology For Further Nitrogen And Phosphorus Removal Basing On Composite Ferric Enzymatic And Composite Filler Biofilm

From 1960's, Water Eutrophication has focused by people all over the world ,controling and treating nitrogen and phosphorus pollution is the essential way to cure it .While the present state of the nitrogen and phosphorus pollution was more and more serious, research on the municipal wastewater treating technology for further nitrogen and phosphorus removal was becoming urgent and essential. The paper was emphasized on composite activated sludge in improving the usual nitrogen and phosphorus removal technology, Experiments and researches wer carried out on processing of town sewage by the composite ferric enzymatic activity sludge and composite filler biofilm activity sludge.The research about composite ferric enzymatic activity sludge results showed that: (1)At normal temperature conditions, the composite iron enzymatic system was better than the traditional biological nitrogen and phosphorus removal system in the effect of the pollutants removal.while DO was not sufficient, the ammonia nitrogen removal rate was 96.9%,which was 18% higher than that of traditional system;while higher ammonia nitrogen of influent, the ammonia nitrogen removal rate was 9.8% higher than that of traditional system; while the restoration stage after the Destruction Test, the ammonia nitrogen removal rate was 9.5% higher than that of traditional system. The specific nitrification rate of the composite iron enzymatic system was 3.5mgNH4~+-N/g MLSS·h, which was 35% higher than that of traditional system; The SOUR activity and dehydrogenase activity of the composite iron enzymatic system were higher than the latter.(2)At low-temperature conditions, the pollutions removal rate of the composite iron enzymatic activated sludge system was significantly higher than the traditional biological nitrogen and phosphorus removal system, the ammonia nitrogen removal rate was 7% higher than that of traditional system , the organic matter removal rate was 4% higher than that of traditional system. To some extent, the composite iron enzymatic system can enhance microbial's biological activity to resist the changes of environmental factors outside.The enhancing effect of the composite iron enzymatic system could occur only when the temperature was higher than 5℃.The research about composite filler biofilm activity sludge results showed that: (1) At normal temperature conditions, while higher hydraulic loading, the ammonia nitrogen removal rate was 93.1% , which was 6% higher than that of traditional system. (2) At low-temperature conditions, the removal efficiencies of COD and NH4~+-N all decreased .Before adding the filler, the COD removal rate was 78%, the ammonia nitrogen removal rate was 65%. After adding the filler, the COD removal rate was 83%, the ammonia nitrogen removal rate was 79%.while Nitrifying Bacteria attached and grown in the filler, nitrification reaction transform from suspended growth to attached growth micro-biologics.