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Microbial community characterization,activity analysis and purifying efficiency in a biofilter process

Journal of Environmental Sciences 2013年第4期25卷 677-687页

作者： Hong Xiang Xiwu Lu Lihong Yin Fei Yang Guangcan Zhu Wuping Liu School of Energy and Environment Southeast University Key Laboratory of Environmental Medicine and Engineering Ministry of Education School of Public Health Southeast University Guizhou Provincial Center for Disease Control and Prevention

The growth and metabolism of microbial communities on biologically activated carbon （BAC） play a crucial role in the purification of drinking water. To gain insight into the growth and metabolic characteristics of microbial communities and the efficiency of drinking water treatment in a BAC filter, we analyzed the heterotrophic plate count （HPC）, phospholipid, dehydrogenase, metabolic function and water quality parameters during start-up and steady-state periods. In the start-up process of the filter with natural biofilm colonization, the variation in heterotrophic plate count levels was S-curved. The total phospholipid level was very low during the first 5 days and reached a maximum value after 40 days in the filter. The activity of dehydrogenase gradually increased during the first 30 days and then reached a plateau. The functional diversity of the microbial community in the filter increased, and then reached a relatively stable level by day 40. After an initial decrease, which was followed by an increase, the removal rate of NH4＋-N and COD_Mn became stable and was 80% and 28%, respectively, by day 40. The consumption rate of dissolved oxygen reached a steady level after 29 days, and remained at 18%. At the steady operation state, the levels of HPC, phospholipid, dehydrogenase activity and carbon source utilization had no significant differences after 6 months compared to levels measured on day 40. The filter was shown to be effective in removing NH4＋-N, NO2--N, CODMn, UV254, biodegradable dissolved organic carbon and trace organic pollutants from the influent. Our results suggest that understanding changes in the growth and metabolism of microorganisms in BAC filter could help to improve the efficiency of biological treatment of drinking water.

关键词： biologically activated carbon microbial community microbial biomass and activity metabolic function pollutant removalrate

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Removal of SO2 using ammonium bicarbonate aqueous solution as absorbent in a bubble column reactor

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 185-191页

作者： Xiaolei LI Chunying ZHU Youguang MA School of Chemical Engineering and Technology State Key Laboratory of Chemical Engineering Tianjin University Tianjin 300072 China

In this work, the removal of SO2 from gas mixture with air and SO2 by ammonium bicarbonate aqueous solution as absorbent was investigated experi- mentally in a bubble column reactor. The effects of the concentration of ammonium bicarbonate, the SO2 inlet concentration of gas phase and the gas flow rate on the removal rate of SO2 were studied. The results showed that the higher the SO2 inlet concentration and the gas flow rate, the shorter the lasting time of SO2 completely removed in gas outlet, and then the faster the decrease in the removal rate of SO2. The lasting time of SO2 completely removed in gas outlet increased with increasing ammonium bicarbonate concentration. During the process of SO2 absorption, there was a critical pH of solution. When the solution pH was less than the critical pH, it would sharply fall, resulting in a rapid decrease of the SO2 removal rate. A theoretical model for predicting the SO2 removal rate has been developed by taking the chemical enhancement and the sulfite concentration in the liquid phase into account simultaneously.

关键词： SO2 removal bubble column reactor removalrate ammonium bicarbonate absorbent

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Purification and utilization of garlic processing wastewater in lotus pond wetlands

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Water Science and Engineering 2014年第4期7卷 395-402页

作者： Jun PANG Xue-ling FENG Xiu-feng WANG College of Arts Taishan University Linyi Research Institute of Environmental Protection College of Horticultural Science and Engineering Shandong Agricultural University

Based on the experiments of utilization of garlic processing wastewater in a lotus pond, this study demonstrates that lotus pond wetlands have a remarkable ability to remove organic pollutants and decrease chemical oxygen demand （CODCr）, biochemical oxygen demand （BOD5）, and suspended substances （SS） in garlic processing wastewater. Results also show evident effects of lotus roots on absorption of NH3-N. The pH value in a lotus pond with wastewater discharged was relatively stable. The water quality in the lotus pond reached the class Ⅱ emission standard, according to the Integrated Wastewater Discharge Standard （GB8978-1996）, seven days after pretreated garlic processing wastewater had been discharged into the lotus pond. Garlic processing wastewater irrigation does not produce pollution in the pond sediment and has no negative effect on the growth of lotus roots. Due to utilization of garlic processing wastewater, the output of lotus roots increased by 3.0% to 8.3%, and the quality of lotus roots was improved. Therefore, better purification and utilization results can be achieved.

关键词： lotus pond wetland garlic processing wastewater ecological treatment removalrate purification and utilization

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