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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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Front Envir Sci Eng Chin    2009, Vol. 3 Issue (1) : 38-47    https://doi.org/10.1007/s11783-009-0007-6
RESEARCH ARTICLE
Field experiment on biological contact oxidation process to treat polluted river water in the Dianchi Lake watershed
Lu LI, Shuguang XIE, Hui ZHANG, Donghui WEN()
College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
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Abstract

In this study two types of biological contact oxidation processes (BCOP), a step-feed (SBCOP) unit and an inter-recycle (IBCOP) unit, were designed to investigate the treatment of heavily polluted river water. The Daqing River, which is the largest pollutant contributor to the Dianchi Lake, one of the most eutrophic freshwater lakes in China, was taken for the case study. It was found that the SBCOP had higher adaptability and better performance in the reduction of COD, TN, and TP, which made it applicable for the treatment of polluted river water entering the Dianchi Lake. Nitrification rate was observed to be greatly affected by the influent temperature. During each season, the nitrification in the SBCOP was higher than that in the IBCOP. TN removal efficiency in the SBCOP was higher than that in the IBCOP during the winter and spring but poorer during the summer, possibly due to the inhibition of denitrification by higher dissolved oxygen level in the summer. Moreover, symbiotic algae-bacteria growth may be conducive to the removal of pollutants.
Keywords step-feed biological contact oxidation process (SBCOP)      inter-recycle biological contact oxidation process (IBCOP)      river water      removal efficiency      nitrogen transformation      the Dianchi Lake watershed     
Corresponding Author(s): WEN Donghui,Email:dhwen@pku.edu.cn   
Issue Date: 05 March 2009
 Cite this article:   
Donghui WEN,Lu LI,Shuguang XIE, et al. Field experiment on biological contact oxidation process to treat polluted river water in the Dianchi Lake watershed[J]. Front Envir Sci Eng Chin, 2009, 3(1): 38-47.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-009-0007-6
https://academic.hep.com.cn/fese/EN/Y2009/V3/I1/38
Fig.1  Schematic diagram of SBCOP and IBCOP in the field experiment
winter dry season (2006/12/19-2007/01/31)spring dry season(2007/03/03-2007/05/08)summer rainy season(2007/05/13-2007/06/14)
air temperature/°C0-176-2810-28
rainless precipitation(only one snowfall)less precipitationfrequent rain with heavy precipitation
sunshinestrong sunshinestrong sunshinemost rainy and cloudy days, except for a few strong sunshine days
source of waste-waterUpriver gate-valve was opened, so that domestic sewage flowed into the river channel.Upriver gate-valve was closed, so that lake water flowed back into the river channel from the Dianchi lake.Upriver gate-valve was opened in the rainy days, so that the mixture of rainwater and sewage flowed into the river channel; otherwise the gate-valve was closed, so that lake water flowed back into the river channel.
water temperature/°C8.5-14.813.9-24.217.9-32.6
DO/(mg·L-1)0.00.7-9.80.1-7.6
CODCr/(mg·L-1)114.7-301.548.3-201.248.8-174.7
TN/(mg·L-1)26.31-37.897.83-19.939.45-18.55
TP/(mg·L-1)0.29-1.740.13-0.570.36-2.24
Tab.1  Local climate and river water conditions during the experiment periods
Fig.2  Variation of water temperature during the experimental period
Fig.3  Variation of DO during the experimental period
Fig.4  Variation of pH during the experimental period
Fig.5  Variation of COD and the removal efficiencies during the experiment period
Fig.6  Variation of TN and the removal efficiencies during the experiment period
Fig.7  Variation of TP and the removal efficiencies during the experiment period
pollutantwinter dry season(2006/12/19-2007/01/31)spring dry season(2007/03/03-2007/05/08)summer rainy season(2007/05/13-2007/06/14)
SBCOPIBCOPSBCOPIBCOPSBCOPIBCOP
CODCrinfluent/(mg·L-1)114.7-301.5114.7-301.548.3-201.248.3-201.248.8-174.748.8-174.7
effluent/(mg·L-1)20.0-205.833.3-211.920.7-88.719.3-80.713.6-77.311.9-92.0
removal efficiency/%28.1-82.229.6-72.023.5-71.97.7-66.121.6-77.66.8-77.8
TNinfluent/(mg·L-1)26.3-37.926.3-37.97.8-19.97.8-19.99.5-18.69.5-18.6
effluent/(mg·L-1)23.2-36.524.2-37.65.4-18.44.3-18.93.9-17.74.4-18.0
removal efficiency/%0.2-15.70.4-17.92.9-35.00.0-52.50.2-67.91.8-57.5
TPinfluent/(mg·L-1)0.29-1.740.29-1.740.13-0.570.13-0.570.36-2.240.36-2.24
effluent/(mg·L-1)0.15-1.40.24-1.630.05-0.30.04-0.340.08-1.860.02-1.65
removal efficiency/%16.5-78.83.4-60.615.4-71.710.4-82.816.7-88.826.4-96.9
Tab.2  Comparison of the treatment efficiencies of SBCOP and IBCOP at different stages
Fig.8  Variation of NH–N and the removal efficiencies during the experiment period
Fig.9  Variation of during the experiment period
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