一种化学法解毒处理电镀污泥及综合利用技术

该发明公开了一种化学法解毒处理电镀污泥及综合利用的技术。该技术的特点是：对电镀污泥先进行常温湿法解毒再进行化学分离、提纯和脱水，生产各种陶瓷色料或生产工业级硫酸铜、硫酸镍，使电镀污泥中的所有化学组分全部实现资源化综合利用。电镀污泥处理过程及有关产品生产过程全部采用“清洁生产”工艺，     

剩余活性污泥的热化学处理技术

介绍了剩余活性污泥各种热化学处理方法：制油、湿式氧化、熔化、气化和制活性炭技术等，评述了各种方法的优点及不足，指出污泥低温热解制油技术颇具发展前景。     

电镀污泥处理现状及进展

电镀污泥性质复杂、危害性大,然而其中蕴藏的重金属资源丰富。在天然矿产资源日益枯竭和环境保护深入人心的背景下,科学处理电镀污泥成为研究热点。从电镀污泥的危害性和资源性出发,对国内外电镀污泥无害处置和重金属回收现状进行综述,讨论了电镀污泥处理的方向。     

电镀污泥资源化利用的研究进展

阐述了电镀污泥的特点及危害,对近年来国内外电镀污泥资源化利用方法的研究进展进行了综述,包括有价金属的回收技术、材料化技术等。系统地总结了各种资源化方法的优势及存在的问题,并对主要资源化技术的应用前景进行了分析。     

污泥热解气化技术的研究进展

通过热解气化等热化学转化方式将污泥转变为液体或气体燃料是极具前景的污泥利用方式之一。从污泥的资源化利用方面着手,阐述了污泥热解气化技术的研究进展,分析了现有污泥热解气化工艺的优缺点和主要影响因素,并对该技术的发展趋势进行了展望。指出:高湿污泥与生物质混合进行共热解可以提高原料的转化率和整个系统的热效率;高效污泥热解气化装置的研发是目前污泥热解气化技术领域亟待解决的问题。     

从电镀污泥中回收有价金属的工艺探究

对电镀污泥资源化现状进行探究,并着重对从电镀污泥中回收有价金属的工艺进行综述。最后对如何在清洁生产条件下回收电镀污泥中有价金属提出设想。     

全国环保产品标准化技术委员会成立

采用化学法处理电镀行业产生的电解污泥，从中分离出有价值的镍、铜、铁金属，工艺简单、消耗材料少、产品价值高，既减少了其对环境的污染，又为企业带来一定的经济收益。     

污泥资源化技术的研究进展

随着城市化进程的加快，城市污水处理量增加，且产生了数量巨大的污泥。如何妥善处理这些污泥已成为世界各国学者共同关注的课题，当今的共识是污泥资源化。综述了近年来污泥消化产沼气、污泥处理获取碳源、污泥作肥料及污泥低温热解制油和产氢等污泥资源化技术的研究进展；甄选出比较可行实用的方法，指出了加强污泥资源化技术研究对我国经济持续发展的重要性。     

油田污泥无害化及资源化处理技术探讨

从分析油田污泥特性入手,对目前油田污泥无害化及资源化处理工程实例进行研究.从处理程度、二次污染、工艺成熟度、使用范围与特点及成本利润等方面分别对污泥无害化和资源化处理技术进行综合比较,分析了各种技术的优缺点,为油田清洁生产提供可靠技术保证,同时提出了油田污泥处理的研究方向.     

污泥深度脱水干化/焚烧技术分析及其经济性评估

全面分析了我国污泥的产生现状,对比分析了目前主要的污泥干化处理处置技术。污泥干化处理技术能够有效对污泥进行深度脱水,并且不改变污泥热值,是一种具有前景的污泥处理工艺。详细介绍了该技术的收集、预处理、深度干化及返混、焚烧发电等步骤,分析了其主要污染物及控制技术。借助示范工程实例中污泥深度脱水干化/焚烧一体化技术工艺的运行状况,对污泥深度脱水干化/焚烧技术进行经济性评估。     

Thermochemical treatment of sewage sludge ashes for phosphorus recovery

Phosphorus (P) is an essential element for all living organisms and cannot be replaced. Municipal sewage sludge is a carrier of phosphorus, but also contains organic pollutants and heavy metals. A two-step thermal treatment is suggested, including mono-incineration of sewage sludge and subsequent thermochemical treatment of the ashes. Organic pollutants are completely destroyed by mono-incineration. The resulting sewage sludge ashes contain P, but also heavy metals. P in the ashes exhibits low bioavailability, a disadvantage in farming. Therefore, in a second thermochemical step, P is transferred into mineral phases available for plants, and heavy metals are removed as well. The thermochemical treatment was investigated in a laboratory-scale rotary furnace by treating seven different sewage sludge ashes under systematic variation of operational parameters. Heavy metal removal and the increase of the P-bioavailability were the focus of the investigation. The present experimental study shows that these objectives have been achieved with the proposed process. The P-bioavailability was significantly increased due to the formation of new mineral phases such as chlorapatite, farringtonite and stanfieldite during thermochemical treatment.     

Comparative assessment of municipal sewage sludge incineration,gasification and pyrolysis for a sustainable sludge-to-energy management in Greece

For a sustainable municipal sewage sludge management, not only the available technology, but also other parameters, such as policy regulations and socio-economic issues should be taken in account. In this study, the current status of both European and Greek Legislation on waste management, with a special insight in municipal sewage sludge, is presented. A SWOT analysis was further developed for comparison of pyrolysis with incineration and gasification and results are presented. Pyrolysis seems to be the optimal thermochemical treatment option compared to incineration and gasification. Sewage sludge pyrolysis is favorable for energy savings, material recovery and high added materials production, providing a ‘zero waste’ solution. Finally, identification of challenges and barriers for sewage sludge pyrolysis deployment in Greece was investigated.     

电镀污泥中铜和镍的回收

采用硫酸酸浸#x02014;铜镍分离#x02014;净化除杂#x02014;沉淀制取硫酸镍的工艺从电镀污泥中回收铜和镍，分别采用硫化钠沉淀法和铁粉置换法研究电镀污泥酸浸液中铜和镍的分离效果。实验结果表明，硫化钠沉淀法对铜和镍的分离效果较好，其最优工艺条件为：硫化钠加入量为理论需求量的1.2倍，硫化钠沉淀温度60℃，硫化钠沉淀时间30min。利用本回收工艺制得的硫酸镍产品中镍的质量分数为18%，镍的回收率达80%以上，铜的回收率达90%以上。     

Hydration and leaching characteristics of cement pastes made from electroplating sludge

The purpose of this study was to investigate the hydration and leaching characteristics of the pastes of belite-rich cements made from electroplating sludge. The compressive strength of the pastes cured for 1, 3, 7, 28, and 90 days was determined, and the condensation of silicate anions in hydrates was examined with the ²⁹Si nuclear magnetic resonance (NMR) technology. The leachabilities of the electroplating sludge and the hardened pastes were studied with the multiple toxicity characteristic leaching procedure (MTCLP) and the tank leaching test (NEN 7345), respectively. The results showed that the electroplating sludge continued to leach heavy metals, including nickel, copper, and zinc, and posed a serious threat to the environment. The belite-rich cement made from the electroplating sludge was abundant in hydraulic β-dicalcium silicate, and it performed well with regard to compressive-strength development when properly blended with ordinary Portland cements. The blended cement containing up to 40% the belite-rich cement can still satisfy the compressive-strength requirements of ASTM standards, and the pastes cured for 90 days had comparable compressive strength to an ordinary Portland cement paste. It was also found that the later hydration reaction of the blended cements was relatively more active, and high fractions of belite-rich cement increased the chain length of silicate hydrates. In addition, by converting the sludge into belite-rich cements, the heavy metals became stable in the hardened cement pastes. This study thus indicates a viable alternative approach to dealing with heavy metal bearing wastes, and the resulting products show good compressive strength and heavy-metal stability.     

Optimization of microwave treatment for dewaterability enhancement of electroplating sludge

Journal of Material Cycles and Waste Management - In this study, the dewaterability characteristics of electroplating sludge have been investigated after treatment with microwave irradiation. While...     

污泥热解催化剂的研究进展

污泥热解处理技术具有较好的应用价值和发展前景,催化剂的加入可提高反应效率,降低处理成本,提高目标产物品质。本文综述了添加不同种类污泥热解催化剂对反应条件、反应过程、反应产物的影响,分析了不同种类催化剂的优势与不足,并对该领域未来的研究方向提出了建议。指出:应深入探究催化剂的作用机理,开发高效、环保型催化剂;重点研发废弃物制备催化剂,实现废物资源化利用;开展污泥与其他废弃物共热解的研究。