普洱市大气环境容量核定研究

结合普洱市实际,通过A-P值法,将普洱市分为城市控制区和城区控制区,计算核定普洱市的理论大气环境容量.该研究成果可作为普洱市合理利用大气环境容量、实现经济建设与环境保护协调发展的技术依据.     

再生资源回收体系建设巡礼——走进天津乘借滨海新区开发开放的快车道加快天津再生资源回收体系建设

2006年,国务院下发<推进天津滨海新区有关问题的意见>,这是党中央、国务院继深圳经济特区、浦东新区之后,又一带动区域发展的重要战略部署.     

发展循环经济实现经济与环境的"双赢"

经济发展一方面为人类提供了空前丰富的物质产品,另一方面却生产出同样空前大量的废气、废水、废渣和噪声.要使经济发展与环境保护由对立走向统一,实现经济与环境的"双赢",必须大力发展循环经济.分析了经济发展与环境保护对立的表现,阐述了经济发展与环境保护如何从对立走向统一,如何实现"双赢".     

关于资源再生经济的企业思考(一)——回眸历史咀嚼个中酸甜苦辣

从市场机制的导入,产业经营的传承,行业模式的变迁,经营方式的选择,资源的集中与对接等方面,回顾了再生资源行业过去30年的发展变化.     

垃圾渗滤液处理技术

垃圾渗滤液是垃圾填埋过程中产生的高浓度有机废水,是国内外污水处理的一大难题.综述了垃圾渗滤液的水质特性,并总结了近年来在垃圾渗滤液的预处理、主体工艺及深度处理技术上的研究进展,对垃圾渗滤液处理技术提出研究方向.     

对完善废旧物资税收政政策的意见和建议

废旧物资税收政策是关系到再生资源行业和企业生存与发展的重要问题,也是目前在保持经济可持续发展和建设节约型社会新形势下,政府机关主管部门和相关企业高度关注的一个重要问题.     

高压输变电工程的电磁影响及防治对策

主要对500kV高压输变电工程产生的电磁环境影响进行了分析和测试,提出了减缓高压输变电工程环境影响的措施和建议,以实现输变电工程经济效益和环境效益的统一.     

研究建立再生资源回收利用数据库

回顾近年来再生资源回收利用发布的数据,对国家和行业制定法律、法规、政策、规划和计划起了一定的参谋作用,但缺乏权威性、规范化和准确度,数据相互矛盾的现象时常发生.提供准确数据,既为制定法律、法规、规划和计划提供科学依据,又是相关行业为政府机关和企业服务的重要内容.建立再生资源回收利用数据库迫在眉睫.并提出研究和建立再生资源回收利用数据库的建议.     

进口废塑料清洁程度定量化合格评定方法的探讨

目前国内对进口废塑料清洁程度的合格评定,长期以来一直采取感官检验的定性方法,引起了较多争议.以<进口可用作原料的固体废物环境保护控制标准--废塑料>(GB16487.12)为依据,分析了GB16487.12对进口废塑料清洁程度进行规定的原因,并在此基础上探讨了对进口废塑料清洁程度采取定量化的合格评定原理,提出参照<一般工业固体废物贮存、处置场污染控制标准>(GB18599)和<生活垃圾填埋污染控制标准>(GB16889)对进口废塑料清洁程度制定定量化限量要求,并建议尽快修订现行国家标准<进口可用作原料的固体废物环境保护控制标准--废塑料>.     

计算机辅助科学研究在环境工程领域的应用

综述了计算机辅助科学研究在环境工程领域中的应用现状,指出了计算机辅助科学在环境工程领域应用的必要性和存在的问题及发展方向.     

矿山含铜酸性废水硫化沉淀过程中硫化氢产生量的控制

对矿山含铜酸性废水硫化沉淀的过程进行了理论分析和实验研究,并提出了控制硫化氢气体产生量的措施。实验结果表明:在矿山含铜酸性废水硫化沉铜过程中,硫氢化钠被Fe³⁺还原成单质硫的反应最容易发生,其次为硫氢化钠与Cu²⁺生成CuS沉淀的反应,产生硫化氢气体的趋势很弱,而生成FeS的趋势最弱;当反应终点电位控制在200 mV时,铜基本上沉淀完全,铁沉淀率很小;硫氢化钠的过剩量较小,可在最大程度上减少硫化氢气体的产生量;随着溶液酸度增加,硫化氢气体的产生量逐渐增加。硫化沉淀反应体系的硫酸质量浓度宜控制在小于4 g/L。     

硫化沉淀-石灰中和工艺处理矿山酸性废水

采用硫化沉淀-石灰中和工艺处理矿山酸性废水.实验结果表明,在硫化钠加入量为 0.80 g/L,反应时间为 15 min 的条件下,经硫化沉淀处理后,Cu 回收率可达 99.96%,Fe 沉淀率为 7.92%,达到了铜铁分离的目的.再经石灰中和处理后的矿山酸性废水达到 GB8978-1996<污水综合排放标准>的一级排放...     

Utilization of the used tire rubber particle in hydrogen sulfide control

The adsorption capacity of fine rubber particle media (FRPM) derived from discarded vehicle tires and the consumer wasted rubber sources was evaluated for hydrogen sulfide treatment. H₂S breakthrough tests were performed at various zinc contents, temperatures, and packing quantities. High zinc concentrations increased the adsorption capacity of FRPM significantly. H₂S removal by FRPM was optimized at a packing quantity of 75 % of the column volume, and the adsorption capacity increased with reactor temperature within the range of 20–85 °C. The regeneration of ZnCl₂ solution was reliable for increasing regeneration capacity of the FRPM-adsorbed H₂S. FRPM seems to be an attractive alternative of H₂S adsorbents in terms of cost effectiveness compared to traditional materials.     

湿法烟气脱硫废水中硫化物的去除试验研究

介绍了聚合硫酸铝铁（PAFS）去除湿法烟气脱硫废水中硫化物的原理。用聚合硫酸铝铁作混凝剂对定州电厂脱硫废水中硫化物进行了处理,并研究了pH值、混凝剂量、搅拌时间等因素对处理效果的影响。     

炼油碱渣废水中硫化物去除技术的研究进展

简单介绍了炼油碱渣废水的来源及特点,综述了近年来炼油碱渣废水中硫化物的去除技术(包括沉淀技术、氧化技术、生物技术、超声波技术、电化学技术等)的研究进展。结合各技术的特点分析指出:以催化氧化为核心,以高效、经济、条件缓和为主要目标的组合工艺的优化与集成以及新型催化剂的研发,是炼油碱渣废水中硫化物去除技术的发展趋势。     

Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

The recycling of poly(vinyl chloride) (PVC) is one of the most important issues in the treatment of waste plastics. To improve PVC recycling, it is necessary to develop new recycling techniques, including new techniques for the dechlorination of chlorine-containing polymers. It has been established that wet dechlorination of PVC in NaOH/ethylene glycol solution is more effective than dry dechlorination. In this study, the wet process was used, and the chemical modification of PVC by nucleophilic substitution was considered for upgrading waste PVC. Chlorine was substituted in solution by several nucleophilic reagents, thus changing the properties of PVC. The reaction of PVC in Na2S/ethylene glycol solution at 170°C resulted in the formation of a mixture comprising 32% elimination and 26% substitution products. The scanning electron microscopy/energy dispersive X-ray spectroscopy mappings and elementary analysis of PVC indicated that this chlorine-substitution process led to cross-linking by sulfur.     

Release characteristics and control of hydrogen sulfide during thermal drying of municipal wastewater sludge

Journal of Material Cycles and Waste Management - Hydrogen sulfide (H2S) is the most predominant malodorous gas released during the thermal drying of municipal wastewater sludge. Experiment using a...     

Attenuation of hydrogen sulfide at construction and demolition debris landfills using alternative cover materials

The attenuation of H₂S emissions by various landfill cover materials was evaluated using both laboratory and field experiments. The results demonstrated that cover materials consisting of selected waste products (compost and yard trash) and soils amended with quicklime and calcium carbonate effectively attenuated H₂S emissions and detectable H₂S emissions were only encountered in a testing plot using a sandy soil cover (average emission rate was 4.67 × 10^?6 mg m^?2 s^?1). H₂S concentration profiles in the cover materials indicated that H₂S was removed as it migrated through the cover materials. At the same depth in the testing area, the H₂S concentration in the sandy soil field plot was always higher than that of other testing plots because the sand (a) demonstrated less ability to remove H₂S and (b) exhibited a higher H₂S concentration at the base of the cover. Laboratory experiments confirmed these observations, with a combination of physical adsorption, chemical reactions, and biological oxidation, accounting for the enhanced removal. In addition to removal, the results suggest that some of the cover materials reduced H₂S generation by creating less favorable conditions for sulfate-reducing bacteria (e.g., high pH and temperature).     

PVP-CdS修饰玻碳电极电化学氧化法测定微量盐酸黄连素

使用不同分散剂制备了聚乙烯吡咯烷酮-硫化镉（PVP-CdS）催化剂,研究了盐酸黄连素在PVP-CdS修饰玻碳电极上的电化学行为。实验结果表明：与裸电极相比,PVP-CdS修饰玻碳电极提高了盐酸黄连素的氧化电流;当外加电压为0.5~1.4 V、电位增量为0.018 V、缓冲溶液pH为6时,盐酸黄连素质量浓度在1~200 mg/L的范围内与氧化峰电流呈良好的线性关系,检出限为0.15 mg/L。通过盐酸黄连素氧化前后的红外谱图分析,推断出了氧化机理。