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Haiping LUO Bangyu QIN Guangli LIU Renduo ZHANG Yabo TANG Yanping HOU 《Frontiers of Environmental Science & Engineering》2015,9(3):522
As the bioelectrochemical system, the microbial fuel cell (MFC) and the microbial electrolysis cell (MEC) were developed to selectively recover Cu2+ and Ni2+ ions from wastewater. The wastewater was treated in the cathode chambers of the system, in which Cu2+ and Ni2+ ions were removed by using the MFC and the MEC, respectively. At an initial Cu2+ concentration of 500 mg·L-1, removal efficiencies of Cu2+ increased from 97.0%±1.8% to 99.0%±0.3% with the initial Ni2+ concentrations from 250 to 1000 mg·L-1, and maximum power densities increased from 3.1±0.5 to 5.4±0.6 W·m-3. The Ni2+ removal mass in the MEC increased from 6.8±0.2 to 20.5±1.5 mg with the increase of Ni2+ concentrations. At an initial Ni2+ concentration of 500 mg·L-1, Cu2+ removal efficiencies decreased from 99.1%±0.3% to 74.2%±3.8% with the initial Cu2+ concentrations from 250 to 1000 mg·L-1, and maximum power densities increased from 3.0±0.1 to 6.3±1.2 W·m-3. Subsequently, the Ni2+ removal efficiencies decreased from 96.9%±3.1% to 73.3%±5.4%. The results clearly demonstrated the feasibility of selective recovery of Cu2+ and Ni2+ from the wastewater using the bioelectrochemical system. 相似文献
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随着我国铜冶炼(原生铜和再生铜)行业对含铜二次资源需求量的增加,集废旧资源回收、拆解和分选、二次资源出售、铜再生利用于一体的产业链逐渐发展壮大起来。然而高能耗、高污染、低质量、低产出的特点在再生铜行业依然存在,环境监管政策和标准也不健全不完善。随着人们对美丽生态环境诉求的增加,必须加强有色金属行业的环境管理。本文对再生铜行业发展和环境管理做了一些思考,特别是对再生铜行业环境管理存在的问题进行了分析,并针对问题提出了几点政策性建议,以期为我国再生铜产业的环境友好发展和环境监管提供借鉴。 相似文献
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对K-Ca-Mg-Cl-H2O体系中硫酸钙结晶介稳区进行了研究.以一定浓度氯化钙溶液与硫酸镁溶液反应结晶的方式,采用激光散射法测定了不同浓度复合盐溶液和温度下硫酸钙过饱和度与结晶之间的关系,并测定了与之平衡的溶解度,从而确定该体系中硫酸钙结晶介稳区宽度,探讨了影响结晶介稳区的因素,以及硫酸钙结晶和结晶相与复合盐溶液浓度... 相似文献
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Yunhai Wu Yajun Wen Jianxin Zhou Julin Cao Yanping Jin Yunying Wu 《Environmental science and pollution research international》2013,20(4):2210-2219
This study evaluates the behavior of coconut charcoal (AC) to adsorb Cr(VI), As(III), and Ni(II) in mono- and multicomponent (binary and ternary) systems. Batch experiments were carried out for mono- and multicomponent systems with varying metal ion concentrations to investigate the competitive adsorption characteristics. The adsorption kinetics followed the mechanism of the pseudo-second-order equation in both single and binary systems, indicating chemical sorption as the rate-limiting step of adsorption mechanism. Equilibrium studies showed that the adsorption of Cr(VI), As(III), and Ni(II) followed the Langmuir model and maximum adsorption capacities were found to be 5.257, 0.042, and 1.748 mg/g, respectively. In multicomponent system, As(III) and Ni(II) adsorption competed intensely, while Cr(VI) adsorption was much less affected by competition than As(III) and Ni(II). With the presence of Cr(VI), the adsorption capacities of As(III) and Ni(II) on AC were higher than those in single system and the metal sorption followed the order of Ni(II)?>?As(III)?>?Cr(VI). The results from the sequential adsorption–desorption cycles showed that AC adsorbent held good desorption and reusability. 相似文献
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Yunhai Wu Jianxin Zhou Yanping Jin Julin Cao Palizhati Yilihan Yajun Wen Yunying Wu 《Environmental science and pollution research international》2014,21(3):1859-1874
The adsorption of Cr(VI) and As(III) by amino-functionalized SBA-15 (NH2-SBA-15) from single and binary systems were investigated in this work. The effects of pH and temperature on the adsorption of NH2-SBA-15 were studied. Adsorption kinetics, isotherm model, and thermodynamics were studied to analyze the experimental data. pH 2 was the optimum condition for the adsorption of Cr(VI) and pH 4 for As(III) adsorption. Increasing temperature had a positive effect on the removal of both Cr(VI) and As(III). The Freundlich isotherm model can depict the adsorption process best. The pseudo-second-order kinetic model fitted well with the kinetic data of Cr(VI) and As(III) in the single-component system. In the binary system, the adsorption of As(III) by NH2-SBA-15 was slightly enhanced with the presence of Cr(VI); however, As(III) had no obvious effect on the removal of Cr(VI). Regeneration experiments indicated that 0.1 mol/L NaHCO3 was an efficient desorbent for the recovery of Cr(VI) and As(III) from NH2-SBA-15; the desorption rates for Cr(VI) and As(III) were 91.6 and 33.59 %, respectively. After five recycling cycles, the removal rates were 88 and 7 % for Cr(VI) and As(III) adsorption by NH2-SBA-15, respectively. 相似文献
100.
论排污许可证制度对点源排放控制政策的整合 总被引:1,自引:0,他引:1
中国水污染防治政策很多,包括环境影响评价、"三同时"、排污收费等,但各项政策基本是分散和独立执行的,没有核心和基础的政策,不成体系,缺乏效率。基于排污许可证作为政府的执法文件的角度,论证了将分散的点源排放控制政策围绕排污许可证整合为系统的排放控制政策体系。中国已具备实施排污许可证制度的基础条件,以排污许可证制度为基础的政策整合对现有点源排放控制政策进行了修改、补充和改进,将其整合为一个系统的点源排放控制政策体系,使各级管理部门可以各司其职,协调合作;协调整合不同类型的政策手段,使命令控制、经济激励和劝说鼓励3类手段相互补充,进一步提高政策执行效率,降低政策执行成本,提高排放控制政策效果、效率,降低执法和守法成本。 相似文献