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71.
72.
生活垃圾渗滤液处理工艺探讨 总被引:2,自引:0,他引:2
分析了国内生活垃圾(以下简称垃圾)渗滤液的特点,探讨了一种比较科学的垃圾渗滤液处理工艺:沉淀-厌氧处理-MBR-纳滤处理,并且分析了各段工艺的原理、特点以及其作用。 相似文献
73.
生活垃圾焚烧处理技术发展分析 总被引:5,自引:0,他引:5
综述了国内外的城市生活垃圾焚烧处理概况,探讨了生活垃圾焚烧处理与环境的关系,介绍了生活垃圾焚烧处理工艺,并对我国生活垃圾焚烧处理技术现状进行了分析。 相似文献
74.
75.
胡志敏 《中国环境管理干部学院学报》2010,20(4):61-65
医疗废物是一类成分复杂并有特殊危害的危险废弃物。通过分析衡水市医疗废物处理过程中存在的分散处置、处理率低等问题,提出了加强管理监督机制、提高医疗废物收集处理率的应对策略。通过综合比较分析几种医疗废物处理方法的优缺点,指出高温焚烧法集中处置是衡水市医疗废物的最佳处理方法。 相似文献
76.
77.
焙烧-酸浸法可有效回收电镀污泥中的有价金属,而污泥的热处理特性是决定能否采用焙烧预处理的重要因素。研究了氧化焙烧和还原焙烧对污泥成分和金属浸出性的影响,并对焙烧前后的污泥进行了金属形态分析和X射线衍射(XRD)分析。结果表明,焙烧预处理实现了污泥减量和金属富集;ES1经氧化焙烧后金属浸出率接近原泥,Cu的浸出率达99%;ES2的还原焙烧效果优于氧化焙烧,特别是Cu的浸出率超过97%,XRD分析发现,还原焙烧过程中金属Cu被还原为铁铜合金;2种焙烧均造成了ES3中目标金属Ni的浸出率的降低;金属浸出性的下降与残渣态的形成有关。 相似文献
78.
Christian Brandstätter David Laner Roman Prantl Johann Fellner 《Waste management (New York, N.Y.)》2014,34(12):2537-2547
Municipal solid waste landfills pose a threat on environment and human health, especially old landfills which lack facilities for collection and treatment of landfill gas and leachate. Consequently, missing information about emission flows prevent site-specific environmental risk assessments. To overcome this gap, the combination of waste sampling and analysis with statistical modeling is one option for estimating present and future emission potentials. Optimizing the tradeoff between investigation costs and reliable results requires knowledge about both: the number of samples to be taken and variables to be analyzed.This article aims to identify the optimized number of waste samples and variables in order to predict a larger set of variables. Therefore, we introduce a multivariate linear regression model and tested the applicability by usage of two case studies. Landfill A was used to set up and calibrate the model based on 50 waste samples and twelve variables. The calibrated model was applied to Landfill B including 36 waste samples and twelve variables with four predictor variables.The case study results are twofold: first, the reliable and accurate prediction of the twelve variables can be achieved with the knowledge of four predictor variables (Loi, EC, pH and Cl). For the second Landfill B, only ten full measurements would be needed for a reliable prediction of most response variables. The four predictor variables would exhibit comparably low analytical costs in comparison to the full set of measurements. This cost reduction could be used to increase the number of samples yielding an improved understanding of the spatial waste heterogeneity in landfills.Concluding, the future application of the developed model potentially improves the reliability of predicted emission potentials. The model could become a standard screening tool for old landfills if its applicability and reliability would be tested in additional case studies. 相似文献
79.
医疗废物处置收费政策是医疗废物处置产业化发展的重要前提和保障。当前,医疗废物处置收费政策执行难,欠费、漏费等问题非常突出,医疗废物集中收集十分困难。在对我国医疗废物处置收费政策进行全面分析和评估的基础上,对当前收费政策存在的主要问题和产生的原因进行了分析。以加快完善医疗废物处置收费政策为目标,从完善政策体系、加强监管执法、提高标准合理性、综合确定费用承担方、制定鼓励性的经济政策、提高宣传和缴费意识等方面,提出医疗废物处置收费政策改革完善的若干建议。 相似文献
80.
Kangjoo Kim Sung-Min Park Jinsam Kim Seok-Hwi Kim Yeongkyoo Kim Jeong-Tae Moon Gab-Soo Hwang Wang-Seog Cha 《Chemosphere》2009,77(2):222-227
The geochemical behavior of As in porewaters of an alkaline coal ash disposal site was investigated using multilevel samplers. The disposal site was in operation from 1983 until 1994 and was covered with 0.3–0.5 m thick soils in 2001 when this study was initiated. Sequential extraction analyses and batch leaching experiments were also performed using the coal ash samples collected from the disposal site. The results suggest the important roles of siderite (FeCO3) precipitation/dissolution and soil cover, which have been ignored previously. Arsenic levels in the porewater were very low (average of 10 μg L−1) when the site was covered with soil due to coprecipitation with siderite. The soil cover enabled the creation of anoxic conditions, which raised the Fe concentration by the reductive dissolution of Fe-(hydr)oxides. Because of the high alkalinity generated from the alkaline coal ash, even a small increase in the Fe concentration (0.66 mg L−1 on average) could cause siderite precipitation. When the soil cover was removed, however, an oxidizing condition was created and triggered the precipitation of dissolved Fe as (hydr)oxides. As a result, the dissolution of previously precipitated As-rich siderite caused higher As concentration in the porewater (average of 345 μg L−1). 相似文献