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Guan S.,Tsinghua University | Zhang H.,Tsinghua University | Zhang H.,Beijing Guohuan Tsinghua Environmental Engineering Design and Research Institute Co. | Wu C.,Tsinghua University | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

A hydrolysis acidification reactor and two-stage of combined biological filter (CBF) were used in the treatment of salt chemical industrial wastewater. The start-up of the process succeeded after 29 days. Operating parameters were as follows: hydraulic loading rate of 0.37~0.74 m/h (not including backflow), recirculation ratio of 100% and gas-water ratio of 3:1. In terms of water quality, the average concentration and the removal efficiencies of COD, NH3-N, TN and SS were 78 mg/L (60%), 1.05 mg/L (93.4%), 18.9 mg/L (63.8%) and 4.9 mg/L (94.5%), respectively, which met secondary biological treatment requirements of salt chemical industrial wastewater. This process was of higher resistance to loading, and the increasing of the hydraulic loading rate (0.37~0.74 m/h) benefited the removal of pollutants. Based on the recording of the pollutant concentration along the process, removals of COD, NH3-N, TN and the SS were discussed in hydrolysis acidification area, first-stage anoxic/aerobic area and second-stage anoxic/aerobic area.


Guan S.,Tsinghua University | Zhang H.,Tsinghua University | Wu C.,Tsinghua University | Cheng L.,Beijing Guohuan Tsinghua Environmental Engineering Design and Research Institute Co. | Ning T.,Beijing Guohuan Tsinghua Environmental Engineering Design and Research Institute Co.
Advanced Materials Research | Year: 2012

This study puts forward the Combined Biological Filter (CBF) as a new type of BAF for advanced treatment of industrial wastewater by changing its position of aeration, particularly for treating high nitrogen with low carbon wastewater. A chemical fertilizer plant is selected to put this set of CBF device after its wastewater treatment station. Methanol is used as external carbon resource for this CBF system. Operating parameters, such as the hydraulic loading rate and C/N ratio, are discussed to determine optimal ones: 0.64m 3/ (m 2·h) and 4:1. Path analysis is recorded to find different contribution of anoxic and aerobic zones of CBF reactor, and different working conditions are compared to find the best performance. CBF process could find further applications and improvement in engineering practices. © (2012) Trans Tech Publications, Switzerland.


Zou S.-Z.,Water Resources University | Zou S.-Z.,Chinese Academy of Geological Sciences | Yu X.-Y.,Chinese Research Academy of Environmental Sciences | Zhang G.-C.,Beijing Guohuan Tsinghua Environmental Engineering Design and Research Institute Co. | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2012

Using narrow-slit experimental plants, this paper simulates behavioral features of dynamic adsorption, physical desorption, chemical desorption of single Mn system, single Cr (VI) system and Mn-Cr (VI) complex system in karst groundwater system. The results indicate that: (1) Under a single system, soil absorption rate of Mn is much larger than that of Cr (VI); and the two are of specific-orientated adsorption, and difficult to be activated and migrate; (2) Under complex system, the two metals both show absorption rate reduction, desorption rate increase and easy to be activated, migrate; (3) the two metals both show synergistic action, however the effect of Mn to Cr (VI) is smaller than that of Cr (VI) to Mn.

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