共查询到18条相似文献,搜索用时 156 毫秒
1.
2.
实验研究了危险废物焚烧高铅飞灰稳定化固化效果,探讨了PH值、不同无机药剂加入对飞灰内Pb及可溶性盐溶出的影响.结果 表明,调节稳定化固化飞灰pH值7.0~11.0时,对Pb的固化效果最好;综合考虑经济效益和固化效果,可以选取工业硫酸铝作为固化剂. 相似文献
3.
对7种城市垃圾焚烧飞灰的物理化学性质进行了详细表征。针对飞灰中重金属成分复杂的特点对重金属含量、形态分布和浸出毒性进行了分析,并进行了风险评估指数和风险指数计算。飞灰的化学组分和晶相结构分析显示,城市垃圾焚烧飞灰中含有大量的CaO、CaSO4、SiO2、Al2O3、NaCl和KCl等化合物,具有资源化利用的潜力。但同时飞灰中含有大量的重金属,其中Pb和Cd的生态风险高,浸出毒性高于飞灰直接处理和处置要求。研究结果表明,垃圾焚烧飞灰需进行处理至达到一定要求后才能进行资源化利用。 相似文献
4.
5.
6.
采用柴油炉,对杭州某生活垃圾焚烧厂的焚烧飞灰连续进行了6个多月、日处理规模为500 kg的熔融固化中试实验,探讨了在1 260~1 350℃熔融过程中,原灰(未经处理的飞灰)、水洗灰的减容减重、成分变化、物相组成以及熔渣浸出毒性的变化规律,同时对烟气中的二恶英和常规污染物进行了测试.结果表明,原灰和水洗灰的减容减重率均随着温度的升高而增大,在1 350℃时,减容率分别为83.7%和81.5%,减重率分别为28.6%和21.9%.由于水洗灰中以氯化物形式挥发的成分减少,使之在相同温度下的减容减重率均小于原灰.随着温度的升高,原灰和水洗灰中CaO、A12O3和SiO2的相对百分含量均增大,其中以SiO2最为显著.根据相关浸出毒性鉴别标准测得溶渣中的重金属浸出浓度低于该标准限值,可作为一般废物填埋.烟气中二恶英总毒性当量浓度远低于标准限值,常规污染物也均符合我国2001年颁布的《危险废物焚烧污染控制标准》(GB18484—2001). 相似文献
7.
垃圾焚烧炉飞灰熔融处理前后的重金属分布特性 总被引:1,自引:1,他引:1
研究探讨了熔融温度、熔融时间、碱基度对飞灰熔融处理前后重金属分布特性的影响.结果表明,熔融温度为1 200℃时Ni、Cr、Cu、As的固溶率最高,除Zn外,熔融温度对Pb、Cd、Hg挥发率影响较小.随熔融时间的增加,Ni、Cr、Cu、As的固溶率在90 min后趋于稳定,Pb、Cd、Hg的挥发率在30 min内达95%以上,接近完全挥发;碱基度较高有利于重金属Ni、Cu、As、Cr的固溶,碱基度变化对Pb、Cd、Hg的挥发率影响较小,低碱基度对Zn的挥发影响较为显著. 相似文献
8.
两种不同焚烧飞灰熔融特性实验研究 总被引:4,自引:0,他引:4
实验选用了 2种不同地区的垃圾焚烧飞灰进行高温熔融实验 ,对试样FA1和FA2的化学组成、熔融温度、熔融时间及外观形貌等特性进行了测试。 2种飞灰主要成分为 :CaO、SiO2 、Al2 O3 及少量的Na2 O、K2 O、Fe2 O3 、MgO。实验研究结果表明 :2种飞灰试样的熔融温度设定在 1 40 0℃ ,最合适熔融时间为 90min;在 1 40 0℃高温下 ,熔融体表观结构平整光滑 ,有较高的硬度 ,其断面有光泽产生且无明显气孔 ,飞灰试样已达到完全熔融。 相似文献
9.
10.
11.
采用螯合剂稳定垃圾焚烧飞灰中的重金属 总被引:10,自引:0,他引:10
介绍了螯合剂的结构特点、合成方式以及稳定重金属的原理,并分析了螯合剂在稳定焚烧飞灰等废渣方面的应用现状和我国目前螯合剂制备方面的技术现状,指出利用螯合剂稳定焚烧飞灰等废渣中重金属所存在的问题、障碍和解决的途径。 相似文献
12.
13.
14.
15.
R. C. Tripathi S. K. Jha L. C. Ram 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(17):2568-2574
Coal contains various organic and inorganic substances including trace quantities of the heavy metals. Therefore, the combustion of coals releases some of the ultimately to the environment of some heavy metals elements in the form of their oxides and in a redistribution of these heavy metals in the surface soil and water bodies, particularly in the vicinity of coal-fired power plants. The fly ash and pond ash of different thermal power stations of India were mixed with soil at different doses separately to compare their impact on crop produce and soil. The present study deals with the presence of the heavy metals in the coal ash and its movement through the amendment of coal ash to the soil and crop produce. 相似文献
16.
Li Jianxin Yan Jianhua Chi Yong 《Frontiers of Energy and Power Engineering in China》2007,1(3):359-364
The content of heavy metals in the main physical compositions of municipal solid waste (MSW) is analyzed. The effects of temperature,
chlorine and water on the partitioning of heavy metals are studied using a laboratory fluidized-bed (FB) furnace with simulated
MSW composition. The experimental results show that temperature and chloride content in the feed have significant influence
on the volatility of heavy metals, especially those of lower boiling point such as Hg, Cd and Zn. The influence of water is
slight.
Translated from Proceeding of the CSEE, 2005, 25(17): 100–104 [译自: 中国电机工程学报] 相似文献
17.
Satish Kumar Kaushal Kumar Munish Gupta 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(16):2370-2376
The disposal of fly ash in the thermal power plant is a challenging task. With the increase in the demand of the coal as fuel in thermal power plants, combustion products, such as coal ash, become a serious environmental problem due to their leaching characteristics. The objective of the present study was to investigate the leaching characteristics of the fly ash disposed in ash pond of thermal power plants. A series of leaching tests have been performed with different liquid-to-solid (L/S) ratio. The L/S ratio varies from 20:1 to 60:1. It is observed that the elements, such as Mn, Mg, Cr, Zn, Ni, Pb, Fe, and Cu, are most abundant elements, while Mo and Co are the least abundant elements. It is also observed that the leaching characteristics of the fly ash are affected by the pH of extraction solution and liquid-to-solid (L/S) ratio. 相似文献
18.
Mani Kanwar Singh Dwarikanath Ratha 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(16):2377-2382
Bottom ash and fly ash are the by-products of coal in thermal power plants. They are the combustion wastes and contain many elements that may harmful to the environment. The present study investigates the physiochemical, mineral, and leaching characteristics of an Indian coal ash (bottom ash and fly ash). From the characterization of bottom ash and fly ash, it is found that the ash samples are enriched predominantly in silica, alumina, and iron oxides. A series of leaching experiments have been performed to analyze the tracing elements of metal at the different liquid to solid ratio (L/S). The L/S varies from 20:1 to 80:1. From the leaching results of the fly ash and bottom ash data, it is observed that the tracing elements of Mn, Mg, Cr, Zn, Ni, Pb, Fe, and Cu are the most abundant elements, while Hg, Mo, and Co are the least abundant elements. 相似文献