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Xiamen, China

Zou Z.-S.,Tsinghua University | Shi H.-C.,Tsinghua University | Chen X.-Q.,Xiamen Water Company Ltd | Xie X.-Q.,Xiamen Water Company Ltd
Huanjing Kexue/Environmental Science | Year: 2014

BioWin software and two sensitivity analysis methods were used to simulate the Denitrification Biological Filter (DNBF) +Biological Aerated Filter (BAF) process in Yuandang Wastewater Treatment Plant. Based on the BioWin model of DNBF+BAF process, the operation data of September 2013 were used for sensitivity analysis and model calibration, and the operation data of October 2013 were used for model validation. The results indicated that the calibrated model could accurately simulate practical DNBF+BAF processes, and the most sensitive parameters were the parameters related to biofilm, OHOs and aeration. After the validation and calibration of model, it was used for process optimization with simulating operation results under different conditions. The results showed that, the best operation condition for discharge standard B was: reflux ratio=50%, ceasing methanol addition, influent C/N=4.43; while the best operation condition for discharge standard A was: reflux ratio=50%, influent COD=155 mg·L-1 after methanol addition, influent C/N=5.10. Source

Yao M.,Chinese Institute of Urban Environment | Yao M.,University of Chinese Academy of Sciences | Luo H.-Y.,Chinese Institute of Urban Environment | Xie X.-Q.,Xiamen Water Company Ltd | And 3 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

Three-dimensional emission and excitation matrixs (EEMs) was used to characterize the soluble micro-products (SMP), loosely-bound extracellular polymeric substances (LB-EPS) and tightly-bound extracellular polymeric substances (TB-EPS) extracted from activated sludge in five municipal wastewater treatment plants in Xiamen (WWTP). Three fluorescence peaks were identified in EEMs of SMP, LB-EPS and TB-EPS, in which Peak A (E x/E m=225~230/335~350 nm) and Peak B (E x/E m=275~280/330~350 nm) were attributed to the protein-like fluorophores, and Peak C (E x/E m=320~350/420~445 nm) was characterized as humic-like fluorophores. Results of the peak intensity showed that the major components of LB-EPS and TB-EPS were significant correlated with TOC concentration in some degree. Fluorescence regional integration (FRI) analysis showed that microbial by-products existed in TB-EPS much more than that in LB-EPS and SMP. The sum FRI of I, II and IV regions presented linear relationship with TOC concentration in LB-EPS and TB-EPS. Source

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