共查询到19条相似文献,搜索用时 312 毫秒
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介绍了有色金属行业中含砷废弃物的两种处理技术——资源化和稳定化-固化的研究进展。从含砷的烟灰、废水及废渣3个方向对资源化处理技术的研究进展进行了介绍,含砷废弃物经资源化处理后可得到As2O3和砷酸盐产品,但砷产品品种有限,应开发新的资源化途径和砷产品。此外,综述了含砷废弃物的稳定化-固化处置技术的研究进展,指出铁盐稳定化优于钙盐稳定化,特别是臭葱石形式的沉淀具有稳定性高、堆存时间长和无需再固化的优点;对比了包胶固化、火法固化及熔融固化3种固化技术的特点,其中水泥包胶固化法的成熟度较高,但仍有改进空间。 相似文献
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通过比较不同稳定剂、固化剂、土壤pH条件下土壤中重金属锑的修复效果,研究了锑的固化-稳定化影响因素并探讨了相关稳定化机理.实验结果表明:铁基稳定剂的效果明显优于磷酸二氢钾和腐殖酸钠,而零价铁的稳定化效果更优于硫酸铁和硫酸亚铁,较适宜的稳定剂投加量为5%(w);水泥做固化剂对锑的稳定化效果优于氧化钙,最佳投加量为5%(w... 相似文献
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《再生资源与循环经济》2017,(3)
龙岩市生活垃圾焚烧厂为有效处理垃圾焚烧所产生的炉渣,以及经固化、稳定化处理后的飞灰,建设了配套填埋场。为杜绝填埋场渗沥液的外渗,同时防止地下水向填埋库区的渗入,并确保填埋场安全可靠的运行,减少渗沥液产生量,避免造成二次污染等问题,建设科学安全有效的防渗系统工程对于填埋场工程来说至关重要。通过对填埋场内部防渗系统的简要介绍及阐述,对适合此配套填埋场的防渗材料、衬层系统和衬层结构以及防渗材料铺设等问题进行了深刻的分析。 相似文献
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鞠阿莲 《再生资源与循环经济》2021,(2)
日本生活垃圾的焚烧率高达80%,对焚烧灰渣的处理也比较先进,其资源化利用方式主要有在熔融设施进行熔融处理后制成熔融灰渣、作为水泥原料及路基材料等。介绍了日本生活垃圾焚烧灰渣的产生及资源化利用情况,以期对我国处理焚烧灰渣有所借鉴。 相似文献
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刘玉文 《再生资源与循环经济》2021,(1):20-24
针对利用原有生活垃圾填埋场改扩建飞灰固化物填埋场,从勘查设计和建设角度,通过与常规生活垃圾填埋的安全和环保各相关因素对比,分析扩建前后填埋场稳定性、防渗及导排系统等勘察设计要点,研讨扩建工程新老填埋堆体基础层、防渗及导排系统等安全环保关键技术及扩建的适宜性,为扩建的可行性研究提出较为系统的技术论证思路. 相似文献
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污染物的固化/安定化处理技术的研究进展 总被引:2,自引:0,他引:2
目前对污染物的固化/安定化处理主要有6大类,即水泥胶结、石灰和火山灰材料胶结、改性粘土吸附、热固树脂胶结、热塑材料胶结和玻璃化技术等.其中基于水泥的固化处理的机理是基于污染物与水泥胶结剂之间发生的吸附、沉淀、氧化还原反应、金属离子的同晶替代和物理匣限作用等.还简要概述了使用S/S技术处理一些常见污染物的方法以及污染物对基于水泥S/S处理的干扰等研究成果. 相似文献
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Li Jingruo Liu Ruiquan Tang Boming Zhang Dongchang Feng Junliang Wang Huoming Zhao Mengzhen 《Journal of Material Cycles and Waste Management》2023,25(3):1581-1593
Journal of Material Cycles and Waste Management - In order to realize the recovery and stabilization of detoxified municipal solid waste incineration fly ash (DIFA) in roadbases, the synergetic... 相似文献
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Duan Yin Zheng Lin Zhao Yimeng Long Ling Liu Xiaobo Jiang Xuguang 《Journal of Material Cycles and Waste Management》2023,25(4):1781-1791
Journal of Material Cycles and Waste Management - MgO-based cementitious material (MCM) is a potential green substitute for solidifying municipal solid waste incineration fly ash (MSWI FA). Sodium... 相似文献
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Comparing urban solid waste recycling from the viewpoint of urban metabolism based on physical input-output model: A case of Suzhou in China 总被引:1,自引:0,他引:1
Investigating impacts of urban solid waste recycling on urban metabolism contributes to sustainable urban solid waste management and urban sustainability. Using a physical input-output model and scenario analysis, urban metabolism of Suzhou in 2015 is predicted and impacts of four categories of solid waste recycling on urban metabolism are illustrated: scrap tire recycling, food waste recycling, fly ash recycling and sludge recycling. Sludge recycling has positive effects on reducing all material flows. Thus, sludge recycling for biogas is regarded as an accepted method. Moreover, technical levels of scrap tire recycling and food waste recycling should be improved to produce positive effects on reducing more material flows. Fly ash recycling for cement production has negative effects on reducing all material flows except solid wastes. Thus, other fly ash utilization methods should be exploited. In addition, the utilization and treatment of secondary wastes from food waste recycling and sludge recycling should be concerned. 相似文献
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As a result of the EU Landfill Directive, the disposal of municipal solid waste incineration (MSWI) fly ash is restricted to only a few landfill sites in the UK. Alternative options for the management of fly ash, such as sintering, vitrification or stabilization/solidification, are either costly or not fully developed. In this paper an accelerated carbonation step is investigated for use with fly ash. The carbonation reaction involving fly ash was found to be optimum at a water/solid ratio of 0.3 under ambient temperature conditions. The study of ash mineralogy showed the disappearance of lime/portlandite/calcium chloride hydroxide and the formation of calcite as carbonation proceeded. The leaching properties of carbonated ash were examined. Release of soluble salts, such as SO4, Cl, was reduced after carbonation, but is still higher than the landfill acceptance limits for hazardous waste. It was also found that carbonation had a significant influence on lead leachability. The lead release from carbonated ash, with the exception of one of the fly ashes studied, was reduced by 2-3 orders of magnitude. 相似文献
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Manufacture of artificial aggregate using MSWI bottom ash 总被引:1,自引:0,他引:1
R. Cioffi F. ColangeloF. Montagnaro L. Santoro 《Waste management (New York, N.Y.)》2011,31(2):281-288
This paper reports the results of an investigation on material recovery by stabilization/solidification of bottom ash coming from a municipal solid waste incineration plant. Stabilization/solidification was carried out to produce artificial aggregate in a rotary plate granulator by adding hydraulic binders based on cement, lime and coal fly ash. Different mixes were tested in which the bottom ash content ranged between 60% and 90%. To avoid undesirable swelling in hardened products, the ash was previously milled and then granulated at room temperature. The granules were tested to assess their suitability to be used as artificial aggregate through the measurement of the following properties: density, water absorption capacity, compressive strength and heavy metals release upon leaching. It was demonstrated that the granules can be classified as lightweight aggregate with mechanical strength strongly dependent on the type of binder. Concrete mixes were prepared with the granulated artificial aggregate and tested for in-service performance, proving to be suitable for the manufacture of standard concrete blocks in all the cases investigated. 相似文献
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Luan Jingde Chai Meiyun Li Rundong Yao Pengfei Wang Lei Li Shaobai 《Journal of Material Cycles and Waste Management》2017,19(3):1204-1210
Journal of Material Cycles and Waste Management - Appropriate management and treatment of fly ash from municipal solid waste (MSW) incineration plant have become an urgent environmental protection... 相似文献
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Soluble salt removal from MSWI fly ash and its stabilization for safer disposal and recovery as road basement material 总被引:1,自引:0,他引:1
Fly ash from municipal solid waste incinerators (MSWI) is classified as hazardous in the European Waste Catalogue. Proper stabilization processes should be required before any management option is put into practice. Due to the inorganic nature of MSWI fly ash, cementitious stabilization processes are worthy of consideration. However, the effectiveness of such processes can be severely compromised by the high content of soluble chlorides and sulphates. In this paper, a preliminary washing treatment has been optimized to remove as much as possible soluble salts by employing as little as possible water. Two different operating conditions (single-step and two-step) have been developed to this scope. Furthermore, it has been demonstrated that stabilized systems containing 20% of binder are suitable for safer disposal as well as for material recovery in the field of road basement (cement bound granular material layer). Three commercially available cements (pozzolanic, limestone and slag) have been employed as binders. 相似文献
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Municipal solid waste incineration (MSWI) ash is rich in heavy metals and salts. The disposal of MSWI ash without proper treatment may cause serious environmental problems. Recently, the local cement industry in Taiwan has played an important role in the management of solid wastes because it can utilize various kinds of wastes as either fuels or raw materials. The objective of this study is to assess the possibility of MSWI ash reuse as a raw material for cement production. The ash was first washed with water and acid to remove the chlorides, which could cause serious corrosion in the cement kiln. Various amounts of pre-washed ash were added to replace the clay component of the raw materials for cement production. The allowable limits of chloride in the fly ash and bottom ash were found to be 1.75% and 3.50% respectively. The results indicate that cement production can be a feasible alternative for MSWI ash management. It is also evident that the addition of either fly ash or bottom ash did not have any effect on the compressive strength of the clinker. Cement products conformed to the Chinese National Standard (CNS) of Type II Portland cement with one exception, the setting time of the clinker was much longer. 相似文献
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Reducing volatilization of heavy metals in phosphate-pretreated municipal solid waste incineration fly ash by forming pyromorphite-like minerals 总被引:1,自引:0,他引:1
This research investigated the feasibility of reducing volatilization of heavy metals (lead, zinc and cadmium) in municipal solid waste incineration (MSWI) fly ash by forming pyromorphite-like minerals via phosphate pre-treatment. To evaluate the evaporation characteristics of three heavy metals from phosphate-pretreated MSWI fly ash, volatilization tests have been performed by means of a dedicated apparatus in the 100-1000 °C range. The toxicity characteristic leaching procedure (TCLP) test and BCR sequential extraction procedure were applied to assess phosphate stabilization process. The results showed that the volatilization behavior in phosphate-pretreated MSWI fly ash could be reduced effectively. Pyromorphite-like minerals formed in phosphate-pretreated MSWI fly ash were mainly responsible for the volatilization reduction of heavy metals in MSWI fly ash at higher temperature, due to their chemical fixation and thermal stabilization for heavy metals. The stabilization effects were encouraging for the potential reuse of MSWI fly ash. 相似文献