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101.
This article describes some laboratory tests performed on each kind of sludge located in an industrial wastes landfill. Measured physical properties are: field capacity, hydraulic permeability, saturation water content, effective porosity and particle-size distribution. The laboratory apparatus is described; the obtained results are analyzed to point out the possible correlations among the examined parameters. The aim of this work is to provide a data bank for industrial wastes landfills useful to perform some applications such as the evaluation of the produced leachate quantity for landfills whose wastes are similar to the ones here considered. 相似文献
102.
William?HoglandEmail author Marcia?Marques Sven?Nimmermark 《Journal of Material Cycles and Waste Management》2004,6(2):119-124
This article describes landfill-mining tests, including excavation, screening, and fraction characterization, carried out in the Msalycke and Gladsax landfills for municipal solid waste (MSW) in Sweden. The excavated waste in these two sites was 17–22 and 23–25 years old, respectively. The main part of Msalycke was unaffected by degradation, and during excavations no substantial amount of biogas was detected. After screening, three size fractions were obtained: <18mm, 18–50mm, and >50mm. Soil amendment and anaerobic digestion with energy extraction are suggested for the first and second fraction, respectively. Incineration with energy recovery is possible with the third fraction after any coarse (inert) material is removed, and construction/demolition waste can easily be recycled provided that it is not contaminated by hazardous material. Excavated waste taken from different depths was also analysed and compared in relation to composition, calorific value, and leachate constituents. 相似文献
103.
104.
《环境科学学报(英文版)》2023,35(4):545-555
Attention should be paid to the sulfate reduction behavior in a pressure-bearing leachate saturated zone. In this study, within the relative pressure range of 0–0.6 MPa, the ambient temperature with the highest sulfate reduction rate of 50°C was selected to explore the difference in sulfate reduction behavior in a pressure-bearing leachate saturated zone. The results showed that the sulfate reduction rate might further increase with an increase in pressure; however, owing to the effect of pressure increase, the generated hydrogen sulfide (H2S) could not be released on time, thereby decreasing its highest concentration by approximately 85%, and the duration extended to about two times that of the atmospheric pressure. Microbial community structure and functional gene abundance analyses showed that the community distribution of sulfate-reducing bacteria was significantly affected by pressure conditions, and there was a negative correlation between disulfide reductase B (dsrB) gene abundance and H2S release rate. Other sulfate reduction processes that do not require disulfide reductase A (dsrA) and dsrB genes may be the key pathways affecting the sulfate reduction rate in the pressure-bearing leachate saturated zone. This study improves the understanding of sulfate reduction in landfills as well as provides a theoretical basis for the operation and management of landfills. 相似文献
105.
就不同源水水质浓缩倍数提高至5~6运行的可行性及影响浓缩倍数达到5~6的主要因素进行了分析,对不同零排污的含义进行了阐述,提出了循环水节水新思路。 相似文献
106.
苏州七子山垃圾填埋场渗沥液设计水质的估算 总被引:5,自引:0,他引:5
在对垃圾填埋场渗沥液污染物的转化、溶出规律分析的基础上,建立了污染物溶出模式和污染物负荷计算模式,并结合苏州七子山垃圾填埋场的实际情况,确定了其渗沥液在不同条件下的水质。研究表明,在填埋场填埋稳定期的枯水期和丰水期的CODcr和BOD5浓度分别为27.24~40.86mg/l、13.17~19.75mg/l和13.46~20.21mg/l、6.51~9.77g/l;在填埋场封场后枯水期和丰水期的CODcr和BOD5分别为4.88~7.33g/1、2.36~3.54g/l和2.22~3.34g/l、1.08~1.617g/l。 相似文献
107.
铬渣中Cr^6+的溶出特性研究 总被引:1,自引:0,他引:1
研究了铬渣中C_r~(6+)的溶出特性。研究表明,铬渣遇水会溶出碱性物质和C_r~(6+)。反复浸出时,其累积溶出负荷持续上升。这表明在碱性条件下,C_r~(3+)易被氧化为C_r~(6+)而溶出。在淋溶初期,其溶出量很高;随后,迅速降低;当C_r~(6+)浓度达到100mg/l以后,下降缓慢。研究得到,C_r~(6+)累积溶出负荷,与流出液体积呈显著对数相关。 相似文献
108.
109.
文章在对长江下游铜陵硫铁矿集中开采区矿山地质环境系统调查的基础上,分析阐述了主要矿山地质环境问题及其成因、分布特征,其中地面塌陷、含水层破坏和水土污染较为严重;结合矿山地质环境现状、保护治理政策及成效,分析预测了矿山地质环境问题的发展趋势,为矿山地质环境恢复治理提供了基础支撑作用。 相似文献
110.
Steven F. Thornton Mildred I. Bright David N. Lerner John H. Tellam 《Journal of contaminant hydrology》2000,43(3-4)
The sorption and degradation of dissolved organic matter (DOM) and 13 organic micropollutants (BTEX, aromatic hydrocarbons, chloro-aromatic and -aliphatic compounds, and pesticides) in acetogenic and methanogenic landfill leachate was studied in laboratory columns containing Triassic sandstone aquifer materials from the English Midlands. Solute sorption and degradation relationships were evaluated using a simple transport model. Relative to predictions, micropollutant sorption was decreased up to eightfold in acetogenic leachate, but increased up to sixfold in methanogenic leachate. This behaviour reflects a combination of interactions between the micropollutants, leachate DOM and aquifer mineral fraction. Sorption of DOM was not significant. Degradation of organic fractions occurred under Mn-reducing and SO4-reducing conditions. Degradation of some micropollutants occurred exclusively under Mn-reducing conditions. DOM and benzene were not significantly degraded under the conditions and time span (up to 280 days) of the experiments. Most micropollutants were degraded immediately or after a lag phase (32–115 days). Micropollutant degradation rates varied considerably (half-lives of 8 to >2000 days) for the same compounds (e.g., TeCE) in different experiments, and for compounds (e.g., naphthalene, DCB and TeCA) within the same experiment. Degradation of many micropollutants was both simultaneous and sequential, and inhibited by the utilisation of different substrates. This mechanism, in combination with lag phases, controls micropollutant degradation potential in these systems more than the degradation rate. These aquifer materials have a potentially large capacity for in situ bioremediation of organic pollutants in landfill leachate and significant degradation may occur in the Mn-reducing zones of leachate plumes. However, degradation of organic pollutants in acetogenic leachate may be limited in aquifers with low pH buffering capacity and reducible Mn oxides. Contaminants in this leachate present a greater risk to groundwater resources in these aquifers than methanogenic leachate. 相似文献