Effect of Temperature on Enhanced Treatment of Sewage from Discharging Points of Rivers by Biofilm Process Dosing with Enzyme

Abstract:

The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and promotion effect of enzyme on treatment of sewage by biofilm process, and investigated the changes of removal rates of the main pollution indexes at different temperature to ensure the optimal temperature. The research results indicated that temperature was an important factor influencing the removal rates of the main pollution indexes. When temperature was in the range of 5°C-8°C, the promotion effects of enzyme on the removals of COD_Cr and ammonia nitrogen (NH₃-N) of sewage by biofilm process were not obvious. However when temperature were in the ranges of 15°C -18°C and 22°C -25°C, enzyme had the high promotion effects on the removals of the pollution indexes. Furthermore, within the certain temperature (5°C -25°C), the removal rates of COD_Cr and NH₃-N were on the rise with the increase of temperature. When temperature increased from 5°C -8°C to 15°C -18°C, the removal rate of COD_Cr obviously increased, but when temperature continued to increase to 25, the rise trend of the removal rate of COD_Cr became slow. On the other hand, when temperature increased from 5°C -8°C to 22°C -25°C, the increase of the removal rate of NH₃-N was always evident. Therefore, the optimal temperature was in the range of 22°C -25°C for the enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 3747-3750
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.3747
• Online since: May 2011
• Authors: Gai Mei Guo
• Keywords: Ammonia Nitrogen, COD_Cr, Enzyme, Sewage, Temperature

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