抄録
To apply biological phosphorus removal for domestic wastewater treatment plant, characteristics of balancing tank effluents and it's influence for biological phosphorus release were studied.
In 20 different balancing tank effluents, the percentage of dissoluble organic substance (D-BOD5/BOD5) varied 20-70% and the variation depend on different operational conditions of balancing tank. Dissoluble TOC (D-TOC) of balancing tank effluent agitated under aerated condition was lower than that agitated in anaerobic condition. And low molecular weight substances of the effluent agitated in aerobic condition were decreased. When flesh wastewater was agitated in anaerobic condition for 24 hours, D-TOC was decreased, and BOD5 and D-BOD5 were not changed. Other hand, when flesh wastewater was seeded by effluent of balancing tank, D-TOC, BOD5 and D-BOD5 were decreased. Especially polysaccharide decreased, and concentration of protein didn't change. The effluent agitated in anaerobic condition have more effects for phosphorous release compared with the effluent agitated in aerobic condition. At the same concentration level of D-TOC, the effluent agitated in anaerobic condition had 12 time effects for the amount of phosphorus release.
It was concluded by these results that operational condition of balancing tank was very important for biological phosphorus removal.
