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21 results on '"Wang, Ruyi"'

21. The application of Biological-Hydraulic coupled model for Tubificidae-microorganism interaction system.

Author

Zhong, Xiao, Sun, Peide, Song, Yingqi, Wang, Ruyi, and Fang, Zhiguo

Subjects
NITRIFICATION, DENITRIFYING bacteria, CHEMICAL reduction, PHOSPHORUS, SEWAGE lagoons, ACTIVATED sludge process, OXIDATION ditches
Abstract

Based on the fully coupled activated sludge model (FCASM), the novel model Tubificidae -Fully Coupled Activated Sludge Model-hydraulic (T-FCASM-Hydro), has been developed in our previous work. T-FCASM-Hydro not only describe the interactive system between Tubificidae and functional microorganisms for the sludge reduction and nutrient removal simultaneously, but also considere the interaction between biological and hydraulic field, After calibration and validation of T-FCASM-Hydro at Zhuji Feida-hongyu Wastewater treatment plant (WWTP) in Zhejiang province, T-FCASM-Hydro was applied for determining optimal operating condition in the WWTP. Simulation results showed that nitrogen and phosphorus could be removed efficiently, and the efficiency of NH4+-N removal enhanced with increase of DO concentration. At a certain low level of DO concentration in the aerobic stage, shortcut nitrification-denitrification dominated in the process of denitrification in the novel system. However, overhigh agitation (>6 mg·L-1) could result in the unfavorable feeding behavior of Tubificidae because of the strong flow disturbance, which might lead to low rate of sludge reduction. High sludge reduction rate and high removal rate of nitrogen and phosphorus could be obtained in the new-style oxidation ditch when DO concentration at the aerobic stage with Tubificidae was maintained at 3.6 g·m-3. [ABSTRACT FROM AUTHOR]

Published
2010
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