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Xia X.,China Environmental Science Research Institute | Xi B.,China Environmental Science Research Institute | Wang M.,Changzhou University
Advanced Materials Research | Year: 2012

In demonstration and promotion of treatment works for rural domestic sewage, the technical solutions should consider not only the treatment technology's effectiveness, but also its economy and suitability for specific rural areas, that is, the advanced and applicable technology should be selected. In this paper, a rural domestic sewage technology evaluation system was established with the analytic hierarchy process as the assessment method to evaluate the alternative technology options and made decision. The indicators quantification and standardization and the weight determination were also promoted. Finally, a case study was conducted. The method can be used as decision support analysis tool in demonstration and promotion of treatment works for rural domestic sewage. © (2012) Trans Tech Publications, Switzerland. Source


Wang M.,Changzhou University | Xia X.,China Environmental Science Research Institute | Chai Y.,Changzhou University | Liu J.,Changzhou University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

The calculation and evaluation of energy conservation and emissions reduction benefits of the rural household biogas project and its up stream and down stream sectors can provide decision making basis for whole process environmental management of the rural household biogas project and rural renewable energy development. In this paper, life cycle assessment method was established with inventory of a typical 8 m3 rural household biogas project and then the net energy conservation and emission reduction benefits were calculated and evaluated. The results showed that the life cycle reduction potentials of eutrophication, acidification, energy depletion, greenhouse effect, human toxicity and photochemical oxidation impacts of a typical 8 m3 household biogas project accounted for 84.84%, 54.37%, 39.16%, 27.67%, 19.35% and 5.55% of the relevant environmental impact potential per capita in the world in 2000, showing a significant net energy conservation and emissions reduction benefits. Therefore, the development of rural household biogas project plays a significant role in alleviating the fossil energy shortage situation and controlling the agricultural non-point source pollution in rural areas. Source


Wang M.,Jiangsu Polytechnic University | Xia X.,China Environmental Science Research Institute | Zhang Q.,Tianjin Institute of Urban Construction | Liu J.,Jiangsu Polytechnic University
International Journal of Sustainable Development and World Ecology | Year: 2010

In this study, a life cycle assessment (LCA) method was used to examine the environmental impact of the rice production system in Taihu region, China. The LCA considered the entire system required to produce 1 t of rice. The analysis included raw material extraction and transportation, agrochemical production and transportation, and arable farming in the field. The result shows that the significance of environmental impacts, followed by aquatic eutrophication, water depletion, global warming, acidification, and energy depletion. As such, reducing nitrogen (N) fertilizer intensity and increasing utilization efficiency are the key points to control the life cycle environmental impacts of rice, which would decrease resource consumption and emissions not only directly in the arable farming subsystem but also indirectly in the upstream production stage. Strengthening water management, especially in the early growth stage, and reduction of paddy field water discharge are also significant measures with which to minimize N and phosphorus (P) runoff losses and control acidification potential (AP) and aquatic eutrophication potential (AEP), so as to reduce life cycle environmental impacts of the rice production system. © 2010 Taylor & Francis. Source


Wang M.,Changzhou University | Min H.,Changzhou University | Xia X.,China Environmental Science Research Institute | Wan Y.,Changzhou University
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012

Soil testing and formulated fertilization project has been carried out across China and its effectiveness is yet to be evaluated. Life cycle analysis can provide comprehensive environmental profile of the project, including its direct and indirect benefits. In this paper, a case study was conducted in Liaocheng City. Life cycle analysis method was used to establish inventory of the winter wheat production system and then the net resource conservation and emission reduction benefits in Soil Testing and formulated fertilization project demonstration area were calculated and evaluated in comparison to the conventional fertilization area. The results revealed great reduction of resource consumption and emissions of the winter wheat production system in project demonstration area resulted from lower input and rational use of fertilizer. The life cycle eutrophication and acidification effect potentials reduction and energy saving potential per ton of winter wheat based on soil testing and formulated fertilization accounted for 6.90%, 1.35% and 0.89% of the relevant environmental impact potential per capita in the world in 2000. The general environmental benefit showed declining trend, which indicated that the Soil Testing and Formulated Fertilization project played its demonstration and extension role. Farmers in conventional fertilization area tended to use nitrogen fertilizer in a desirable amount, but the phosphate intensity was still high, which was the key point for further improving the life cycle environmental benefits of the project. Source


Chen Y.,Changzhou University | Liu X.,China Environmental Science Research Institute | Wang M.,Changzhou University | Wang J.,Changzhou University | Yan X.,Changzhou University
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

A hydroponic experiment was conducted to investigate the physiological parameters, Cd accumulation and subcellular distribution characteristics in energy crop Ricinus communis (Zibima 3) with different Cd doses in nutrient solution (0, 10, 25, 50, 100, 200, 400 μmol·L-1). The results show no significant differences of MDA contents between all Cd treatments. However, chlorophyll contents are sensitive to Cd supply, so it can be used as the Cd tolerance index for Ricinus communis. The Cd contents and uptakes in roots, stems and leaves increase with elevating Cd supply in nutrition solution. The Cd contents in the plant tissues are generally in the sequence root>stem>leaf. The roots demonstrate high accumulation and sequestration capacity of Cd. The Cd subcellular distribution is in the order of soluble fraction>cell wall>organelle in both roots and leaves. In addition, the Cd accumulation percentages in cell wall show increasing trend with elevating Cd supply. Therefore, vacuolar compartmentalization and cell wall binding are supposed to be the main tolerance mechanism to Cd in Ricinus communis. The stem-leaf translocation factors are 0.35~0.62 and the root-stalk transfer coefficients are only 0.02~0.11. Thus, the low translocation ability of cadmium from root to stem may be the limiting factor of accumulation ability in aerial parts of Ricinus communis. Statistical analysis shows significant effects of Cd subcellular distribution on Cd translocation capacity in plants. The root-stem translocation coefficients show negative relationship with the Cd content percentages in the root cell wall and cell organelles, but they are positively related to the Cd content proportions in soluble fractions. Source

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