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81.
Effect of the ecological water conveyance project on environment in the Lower Tarim River, Xinjiang, China 总被引:1,自引:0,他引:1
The dynamic response of groundwater level is examined in traverse and lengthways directions. Take the Yinsu section for an example, we have simulated groundwater levels before and after water-conveyance every time and calculated the incidence of groundwater on the both sides of the river. It is noted that the effect keeps growing with the water-delivery times increasing, from 570 m after the first times to 3,334 m after the eighth times. In addition, this paper involves the temporal response of the natural vegetation to water conveyance, vegetation coverage, planted-species number, dominant position and species diversity from 2002 to 2006. The findings indicate that the positive influence of ecological water conveyance project (EWCP) on the ecosystem in the Lower Tarim River is a long-term process. In this paper, we try to calculate water required for recovery of damaged ecosystem by using data available. This project is likely the base of research on water demand and the reference of measures for research on ecological water conveyance effect. 相似文献
82.
贵州省部分地区土壤中酞酸酯类污染现状调查 总被引:4,自引:1,他引:4
对贵州省部分地区表层土壤中酞酸酯类的污染状况进行了调查。分别在遵义地区、黔南地区、黔东南地区和毕节地区采集483个土壤样品分析,结果表明,样品中酞酸酯总质量比(ΣPAEs)为未检出~8.22 mg/kg,均值为0.63 mg/kg。其中DEHP和DBP为主要污染物,均值分别为0.32 mg/kg和0.24 mg/kg,检出率分别为90.89%和97.10%。 相似文献
83.
84.
美国瑞典日本农药环境管理综述 总被引:2,自引:0,他引:2
我国是个农业大国 ,农药的使用量大 ,使用品种多 ,农药对生态环境污染较为严重。长期以来 ,我国的农药环境管理极其薄弱 ,农药环境管理体系不完善。国外一些国家如美国、瑞典、日本等农药管理体制比较健全 ,在农药环境管理方面取得了一些成功经验 ,这对我国建立农药管理体系有很好的借鉴意义。 相似文献
85.
运用动力学原理和投入产出法则研究了浙江省某铅锌冶炼厂周围农业土壤中镉的污染因素。得出猪栏肥等有机肥是污染土壤的关键因子。提出了不搞稻草还田,而是采用养殖蚯蚓和种植蕨类植物的方法,以达到控制镉污染和净化土壤的目的。 相似文献
86.
87.
Lilai Xu Tao Lin Ying Xu Lishan Xiao Zhilong Ye Shenghui Cui 《Journal of Material Cycles and Waste Management》2016,18(2):377-384
Comprehensive study of the factors influencing household solid waste (HSW) generation is crucial and fundamental for exploring the generation mechanism and forecasting future dynamics of HSW. A case study of Xiamen Island, China was employed to reveal the direct and indirect effects of demographic/socioeconomic factors on solid waste generation at the urban household scale. Based on a face-to-face questionnaire and two-stage survey of solid waste generation, a path analysis model was built. Results showed that the proposed path model exhibited good fit indices. Family size and dinning-at-home rate (DR), whose coefficients were ?0.40 and 0.43, respectively, were the two major factors influencing HSW directly. Moreover, family size, education level, employment rate and age structure played different degrees of indirect effects on HSW generation through respective paths, which should not be ignored. In terms of total effects, coefficients of family size, DR and employment rate were ?0.46, 0.43 and ?0.37, respectively, which were three most dominant factors influencing HSW generation. As for waste composition, organic waste was the most representative of HSW dynamics, and was the most sensitive to impact by the factors studied. Quantitative results of this study have important policy implications for sustainable municipal solid waste management. 相似文献
88.
Ye Sun Yuan Meng Xiaoyan Guo Tianle Zhu Hongju Liu Wenpei Li 《Journal of Material Cycles and Waste Management》2016,18(4):618-624
Experiments were conducted using a bubbling reactor to investigate nitrogen oxide absorption in the calcium sulfite slurry. The effects of CaSO3 concentration, NO2/NO mole ratio and O2 concentrations on NO2 and SO2 absorption efficiencies were investigated. Five types of additives, including MgSO4, Na2SO4, FeSO4, MgSO4/Na2SO4 and FeSO4/Na2SO4, had been evaluated for enhancing NO2 absorption in CaSO3 slurry. Results showed that CaSO3 concentration had significant impact on NO2 and SO2 absorption efficiencies, and the highest absorption efficiencies of SO2 and NO2 could reach about 99.5 and 75.0 %, respectively. Furthermore, the NO2 absorption was closely related to the NO2/NO mole ratio, and the existence of NO2 in flue gas may promote NO absorption. The presence of O2 in simulated flue gas was disadvantage for NO x removal because it can oxidize sulfite to sulfate. It was worth pointing out that FeSO4/Na2SO4 was the best additive among those investigated additives, as the NO2 removal efficiency was significantly increased from 74.8 to 95.0 %. IC and in situ FTIR results suggest that the main products were NO3 ? and NO2 ? in liquid phase and N2O, N2O5 and HNO3 in gas phase during the CaSO3 absorption process. 相似文献
89.
钢渣吸附Pb2+的动力学研究 总被引:1,自引:0,他引:1
采用批式振荡吸附法研究了钢渣吸附Pb^2+的动力学。研究结果表明,钢渣吸附Pb^2+的动力学控制步骤(简称动力学控制步骤)随实验条件的变化而变化:钢渣粒径大于120μm、振荡器转速小于150r/min或Pb^2+初始质量浓度小于150mg/L时,孔扩散是动力学控制步骤;钢渣粒径小于120μm、振荡器转速大于150r/min或Pb^2+初始质量浓度大于150mg/L时,表面扩散是动力学控制步骤;钢渣对Pb^2+的吸附反应是二级反应,其吸附速率为13.26g/(mg.min)。 相似文献
90.
用生物填料塔处理三甲胺废气 总被引:1,自引:0,他引:1
为解决废气中有机胺类物质的恶臭污染问题,采用自制生物填料塔处理三甲胺废气,考察了生物填料塔运行的主要影响因素及对三甲胺废气的净化效果。实验结果表明,在进气中三甲胺质量浓度为80.00mg/m3、气体流量为0.3m3/h(停留时间不小于30s)、循环液喷淋密度为0.5m3/(m2.h)的条件下,三甲胺去除率达99.9%,净化后气体能达到国家二级排放标准;生物填料塔对三甲胺的总去除量与容积负荷呈直线关系,相关系数达0.9949,表明三甲胺废气的生物净化效果显著。 相似文献