An ecological filter is constructed for successful nitrification instead of conventional filter system. Zeolite and coal cinder compose main substrates of this micro-ecological filter. Nitrogen contamination removal p...An ecological filter is constructed for successful nitrification instead of conventional filter system. Zeolite and coal cinder compose main substrates of this micro-ecological filter. Nitrogen contamination removal process is investigated in three different systems (D system, A system and N system) contrastively. Dominant bacteria colony is applied to intensify the remedying process. The data showed that, NH4+-N removal efficiency in D system is better than those in the other two systems for zeolite absorption, nitrogen removal efficiency by nitrification increased. Functional bacterium consortium can adsorb much NH4+-N in short time. Most nitrogen removal is hastened through nitrification by abundant nitrous and nitride bacterium in dominant colony. That dominant consortium keeps high activity in long time. Phosphorus removal is improved by abundant aboriginal bacterium. Complex functional bacterium is benefit to decompose organic phosphorus and its removal.展开更多
Ecological disasters and economic losses resulting from oil spills have reminded us the necessity for finding an environmentally friendly, cost-effective, and available in large-scale materials to minimize the oil spi...Ecological disasters and economic losses resulting from oil spills have reminded us the necessity for finding an environmentally friendly, cost-effective, and available in large-scale materials to minimize the oil spill effects. The development of high oil/water selectivity mineral sorbent for the removal of oil from the water is of great interest for oil spill cleanup. In this work, highly oil/water selectivity sorbent of expanded perlite modified with stearic acid was prepared by solution-immersion processes, and the characterization of sorbent was analyzed by Fourier transformation infrared (FT-IR) spectroscopy technique. The optimized amount of loaded stearic acid (SA) on the expanded perlite surface was found to be 2.0%. Then the sorption characteristics of unmodified expanded perlite (UMEP) and stearic acid modified expanded perlite (SMEP) were tested. The effects of different particles size, oil/water volume ratio and sorption simulated condition were investigated. It was found that expanded perlite modified with stearic acid could adsorb selectively oil from water in oil/water system. The maximum oil/water sorption ratio of SMEP was 46, which was about 191 times that of UMEP (0.24) in studied experimental range. The FT-IR analysis demonstrated the presence of long-chain alkyl group in the SMEP samples, which played an important role in oil/water selectivity of SMEP samples. The equilibrium were tested with Langmuir and Freundlich isotherm models, and oil sorption process of SMEP showed good correlation with the Langmuir isotherm model.展开更多
基金Sponsored by the National Natural Science Foundation of China (Grant No. 50809037)Open Project of State Key Laboratory of Urban Water Resourceand Environment (Grant No. ES201004)Shanghai Leading Academic Discipline Project (Grant No. S30109)
文摘An ecological filter is constructed for successful nitrification instead of conventional filter system. Zeolite and coal cinder compose main substrates of this micro-ecological filter. Nitrogen contamination removal process is investigated in three different systems (D system, A system and N system) contrastively. Dominant bacteria colony is applied to intensify the remedying process. The data showed that, NH4+-N removal efficiency in D system is better than those in the other two systems for zeolite absorption, nitrogen removal efficiency by nitrification increased. Functional bacterium consortium can adsorb much NH4+-N in short time. Most nitrogen removal is hastened through nitrification by abundant nitrous and nitride bacterium in dominant colony. That dominant consortium keeps high activity in long time. Phosphorus removal is improved by abundant aboriginal bacterium. Complex functional bacterium is benefit to decompose organic phosphorus and its removal.
基金the Important National Science&Technology Specific Project(No.2009ZX07317-006-02)State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.2013DX06)
文摘Ecological disasters and economic losses resulting from oil spills have reminded us the necessity for finding an environmentally friendly, cost-effective, and available in large-scale materials to minimize the oil spill effects. The development of high oil/water selectivity mineral sorbent for the removal of oil from the water is of great interest for oil spill cleanup. In this work, highly oil/water selectivity sorbent of expanded perlite modified with stearic acid was prepared by solution-immersion processes, and the characterization of sorbent was analyzed by Fourier transformation infrared (FT-IR) spectroscopy technique. The optimized amount of loaded stearic acid (SA) on the expanded perlite surface was found to be 2.0%. Then the sorption characteristics of unmodified expanded perlite (UMEP) and stearic acid modified expanded perlite (SMEP) were tested. The effects of different particles size, oil/water volume ratio and sorption simulated condition were investigated. It was found that expanded perlite modified with stearic acid could adsorb selectively oil from water in oil/water system. The maximum oil/water sorption ratio of SMEP was 46, which was about 191 times that of UMEP (0.24) in studied experimental range. The FT-IR analysis demonstrated the presence of long-chain alkyl group in the SMEP samples, which played an important role in oil/water selectivity of SMEP samples. The equilibrium were tested with Langmuir and Freundlich isotherm models, and oil sorption process of SMEP showed good correlation with the Langmuir isotherm model.
