作者机构：
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, P. R. China;Department of Environmental Science and Engineering, College of Resource and Environment. Hunan Asri
会议名称：
7th International Conference on Environmental Anaerobic Technologies and Bioenergy(第七届国际环境厌氧技术与生物能源大会)
会议时间：
2011-11-12
会议地点：
天津
会议论文集名称：
7th International Conference on Environmental Anaerobic Technologies and Bioenergy(第七届国际环境厌氧技术与生物能源大会)论文集
摘要：
A bio-trickling filter was self-designed and installed for desulfurization in this study. Three types of fillers, PVC material, activated carbon, activated carbon fiber were chosen for comparing the eliminated efficiency of hydrogen sulfide in biogas. The results showed that Supernatant of activated sludge was more effective in removing H2S than pure water. The order of domestication and bio-film holding ability was activated carbon fiber>activated carbon>PVC material. Therefore, activated carbon fiber was chosen as the carrier of the desulfurization microbe. The removal rate of H2S up to 98.0％ or more can be obtained under the following experimental conditions: a maximum H2S load of 60L/h, pH of 2-5 and a spray flow rate of 120 L/m3.d.
摘要：
[Objective] This paper aimed at exploring the countermeasures for cultivated land protection and food security assurance and providing references for the formulation of policies related to cultivated land and grain production of the whole province.[Methods] Data of population,cultivated land,grain and others in Hunan Province during 1989 to 2008 were collected by county（district）.The changes of cultivated land and grain production of the whole province were analyzed using Geographical Information System（GIS）.[Results] The population was increasing continuously,the total area of cultivated land was reducing as a whole in spite of increasing in one or two year in one or two county,the total grain production and per capita grain yield was fluctuated within a certain range in recent 20 years of the whole province.The reducing of cultivated land was mainly due to the industrialization and urbanization development.The unbalanced quantity and quality of cultivated land,various natural disasters,readjustment of industry structure and inner readjustment in the agriculture,variety improvement and improvement of cultivated technology mainly affected of the grain production.[Conclusions] The protection of the quantity and quality of cultivated land has to be strengthened to ensure food security.It is important to enhance the ability of resisting drought and flood disasters by improving the construction of agriculture establishment in order to insure the productivity of cultivated land,to increase farmer’s enthusiasm for growing grain with favourable food policy,to improve the per unit area yield of grain by variety improvement and to increase grain sown area by enlarging the double-cropping rice sown area.
