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Zhang, Wei
- Water Pollution and Relevant Preventive Measures in the Hechuan Segment of Fujiang River
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Authors
Affiliations
1 Urban Construction and Environmental Protection Research Institute of Chongqing Research Center for Jialing River Development, Chongqing Technology and Business Institute, Chongqing 400052, CN
2 Chongqing Hechuan Wutie Development Investment Co., Ltd., Hechuan, Chongqing 401520, CN
3 Far Eastern Federal University, Vladivostok 690901, RU
1 Urban Construction and Environmental Protection Research Institute of Chongqing Research Center for Jialing River Development, Chongqing Technology and Business Institute, Chongqing 400052, CN
2 Chongqing Hechuan Wutie Development Investment Co., Ltd., Hechuan, Chongqing 401520, CN
3 Far Eastern Federal University, Vladivostok 690901, RU
Source
Nature Environment and Pollution Technology, Vol 14, No 4 (2015), Pagination: 1003-1010Abstract
Dissolved oxygen (DO), NH4+-N, total phosphorus (TP), CODMn and BOD5 in water in the Hechuan segment of Fujing River were monitored to assess water pollution in the river scientifically. Water pollution indexes were analysed and their pollution load-sharing ratios were calculated by using single pollution index method and Nemerow comprehensive pollution index method, respectively. Results show that the water quality in 25% of the monitored sections can be considered clean and the water quality of 75% of the sections can be considered slightly polluted in two water functional zones in the Hechuan segment of Fujiang River with water quality control targets of Level III and Level IV, respectively. Water quality declines from upstream to downstream. DO does not exceed standards in all the sections. NH4+-N significantly contributes to water pollution in all the sections; as a consequence, NH4+-N is a major pollution index in the entire Fujiang River. In some sections, TP, CODMn and BOD5 yield high pollution load sharing ratios. The distribution of the main pollution sources of different sections shows that the pollution indexes exceeding standards are mainly influenced by various pollution factors, such as cultivation, industrial wastewater, urban and rural domestic sewage, and agricultural non-point sources. Therefore, relevant preventive measures and recommendations are provided as a reference of the comprehensive control of water pollution in the Hechuan segment of Fujiang River.Keywords
Fujiang River, Water Monitoring, Water Pollution, Resource Prevention.Full Text
References
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- Pilot-Scale Submerged Hollow Fibre Membrane Bioreactor Thickening Operation: Membrane Clogging, Sustainable Flux and Sludge Characteristics Assessment
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Authors
Affiliations
1 College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038, CN
2 Graduate School, Hebei University of Engineering, Handan, 056038, CN
1 College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038, CN
2 Graduate School, Hebei University of Engineering, Handan, 056038, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 1 (2018), Pagination: 261-268Abstract
The sludge characteristics and their impact on membrane clogging propensity and flux behaviours by statistical analyses were investigated in a pilot-scale hollow fiber membrane bioreactor during thickening operation at constant F/M ratio of 0.13. The cleaning efficiencies by chemical enhanced backflushing (CEB) and mechanical declogging at different mixed liquor suspended solids (MLSS) concentration and flux levels were further assessed through (post-cleaning) permeability decline rates. The results showed that MLSS concentration exerted the greatest impacts on the ratio of accumulated solids to mixed liquor solids loading (ΔK) and sustainable flux (JSUS), and its measurement could be used to predict both ΔK and JSUS, with a strong correlation between ΔK and JSUS observed. Moreover, membrane permeability recovery exhibited strong dependence on MLSS concentration and operational flux. On the premise of sub-critical flux operation, the recovered permeability can be sustained with a standard chemical enhanced backflushing (CEB) or declogging combined CEB at low (~8 g/L) or high (20-32 g/L) MLSS concentrations. However, the recovered permeability could only be obtained instantaneously regardless of cleaning modes when operation is exposed to super-critical flux condition, indicating the significance of the operational flux on membrane permeability sustainability.Keywords
Membrane Bioreactor, Clogging, Sustainable Flux, Sludge Characteristics, Cleaning.Full Text
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