共查询到17条相似文献,搜索用时 203 毫秒
1.
韩静 《中国环境管理干部学院学报》2012,22(2):52-54
垃圾填埋场渗滤液属于高浓度氨氮废水,其水量、水质特性变化大,成分复杂,因此较难处理。反渗透分离技术能有效截留垃圾渗滤液中溶解态的有机和无机污染物。采用三级反渗透处理垃圾渗滤液工艺处理后的出水水质,能够满足《生活垃圾填埋污染控制标准》(DB16889-2008)要求,并把渗滤液浓缩液回灌于填埋场。 相似文献
2.
3.
4.
渗滤液回灌在实际应用中应注意的问题 总被引:3,自引:0,他引:3
本文介绍了垃圾填埋场渗滤液回灌的机理、优缺点,“干填埋”与“湿填埋”之间的区别。渗滤液回灌可增加填埋废物的含水率,加快垃圾的降解速率,减少渗滤液的处理时间,提高填埋气中甲烷的含量,加速填埋场稳定化进程。鉴于以上这些优点,渗滤液回灌作为一种渗滤液处理方式将会有极大的应用前景。但在实际应用中回灌的渗滤液容易泄漏而导致地下水污染,这是影响渗滤液回灌广泛应用的主要原因。为了避免使地下水受污染,本文总结和分析了渗滤液回灌在实际应用中应注意的问题。 相似文献
5.
本文对填埋场渗滤液产生和运移的水力学特性的研究成果进行了总结,建立在填埋垃圾均质各向同性假设基础上的渗滤液运移模型不能满足日后生物反应器填埋场渗滤液回灌系统的设计和操作运行需要,基于填埋垃圾非均质各向异性的填埋场水力学特性将是今后研究的重点。 相似文献
6.
回灌型准好氧填埋场渗滤液中COD浓度的预测模型探讨 总被引:1,自引:0,他引:1
基于进行的室内模拟试验,推导了回灌型准好氧填埋场COD浓度计算模型,并通过模拟试验结果确定了模型参数。结果表明,模型的相关系数为0.91,该模型可用于该类填埋场COD浓度的预测。本研究可为回灌型准好氧填埋场的设计提供依据。 相似文献
7.
通过室内模拟试验,在渗滤液回灌的厌氧填埋柱基本进入稳定状态后,改用准好氧运行方式。同时监测了渗滤液中有机物浓度以压温度、pH值的变化。改变模拟垃圾柱的运行方式两个月以后。氨氯浓度由2000mg/L迅速下降至101.48mg/L,试验结果显示,准好氧运行方式可以解决生物反应器填埋场进入稳定阶段后存在的氨氮浓度高的问题,加速填埋场的稳定。 相似文献
8.
9.
10.
11.
In this study, two pilot-scale aerobic landfill reactors with (A1) and without (A2) leachate recirculation are used to obtain
detailed information on the quantity and quality of leachate in aerobic landfills. The observed parameters of leachate quality
are pH, chloride (Cl−), chemical oxygen demand (COD), biological oxygen demand (BOD), total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH3-N), and nitrate (NO3–-N). pH values of the leachate increased to 7 after 50 days in reactor A1 and after 70 days in reactor A2. Cl− concentrations increased rapidly to 6100 (A1) and 6900 (A2) mg/L after 80 days, from initial values of 3000 and 2800 mg/L,
respectively. COD and BOD values decreased rapidly in the A1 landfill reactor, indicating the rapid oxidation of organic matter.
The BOD/COD ratio indicates that leachate recirculation slightly increases the degradation of solid waste in aerobic landfills.
NH3-N concentrations decreased as a result of the nitrification process. Denitrification occurred in parts of the reactors as
a result of intermittent aeration; this process causes a decrease in NO3− concentrations. There is a marked difference between the A1 and A2 reactors in terms of leachate quantity. Recirculated leachate
made up 53.3% of the leachate generated from the A1 reactor during the experiment, while leachate quantity decreased by 47.3%
with recirculation when compared with the aerobic dry landfill reactor. 相似文献
12.
Sanphoti N Towprayoon S Chaiprasert P Nopharatana A 《Journal of environmental management》2006,81(1):27-35
In order to increase methane production efficiency, leachate recirculation is applied in landfills to increase moisture content and circulate organic matter back into the landfill cell. In the case of tropical landfills, where high temperature and evaporation occurs, leachate recirculation may not be enough to maintain the moisture content, therefore supplemental water addition into the cell is an option that could help stabilize moisture levels as well as stimulate biological activity. The objectives of this study were to determine the effects of leachate recirculation and supplemental water addition on municipal solid waste decomposition and methane production in three anaerobic digestion reactors. Anaerobic digestion with leachate recirculation and supplemental water addition showed the highest performance in terms of cumulative methane production and the stabilization period time required. It produced an accumulated methane production of 54.87 l/kg dry weight of MSW at an average rate of 0.58 l/kg dry weight/d and reached the stabilization phase on day 180. The leachate recirculation reactor provided 17.04 l/kg dry weight at a rate of 0.14l/kg dry weight/d and reached the stabilization phase on day 290. The control reactor provided 9.02 l/kg dry weight at a rate of 0.10 l/kg dry weight/d, and reached the stabilization phase on day 270. Increasing the organic loading rate (OLR) after the waste had reached the stabilization phase made it possible to increase the methane content of the gas, the methane production rate, and the COD removal. Comparison of the reactors' efficiencies at maximum OLR (5 kgCOD/m(3)/d) in terms of the methane production rate showed that the reactor using leachate recirculation with supplemental water addition still gave the highest performance (1.56 l/kg dry weight/d), whereas the leachate recirculation reactor and the control reactor provided 0.69 l/kg dry weight/d and 0.43 l/kg dry weight/d, respectively. However, when considering methane composition (average 63.09%) and COD removal (average 90.60%), slight differences were found among these three reactors. 相似文献
13.
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
14.
Evaluation of leachate recirculation on nitrous oxide production in the Likang Landfill,China 总被引:1,自引:0,他引:1
Landfill leachate recirculation is efficient in reducing the leachate quantity handled by a leachate treatment plant. However, after land application of leachate, nitrification and denitrification of the ammoniacal N becomes possible and the greenhouse gas nitrous oxide (N2O) is produced. Lack of information on the effects of leachate recirculation on N2O production led to a field study being conducted in the Likang Landfill (Guangzhou, China) where leachate recirculation had been practiced for 8 yr. Monthly productions and fluxes of N2O from leachate and soil were studied from June to November 2000. Environmental and chemical factors regulating N2O production were also accessed. An impermeable top liner was not used at this site; municipal solid waste was simply covered by inert soil and compacted by bulldozers. A high N2O emission rate (113 mg m-2 h-1) was detected from a leachate pond purposely formed on topsoil within the landfill boundary after leachate irrigation. A high N2O level (1.09 micrograms L-1) was detected in a gas sample emitted from topsoil 1 m from the leachate pond. Nitrous oxide production from denitrification in leachate-contaminated soil was at least 20 times higher than that from nitrification based on laboratory incubation studies. The N2O levels emitted from leachate ponds were compared with figures reported for different ecosystems and showed that the results of the present study were 68.7 to 88.6 times higher. Leachate recirculation can be a cost-effective operation in reducing the volume of leachate to be treated in landfill. However, to reduce N2O flux, leachate should be applied to underground soil rather than being irrigated and allowed to flow on topsoil. 相似文献
15.
16.
Henk M. Haitjema 《Journal of the American Water Resources Association》1991,27(5):791-796
ABSTRACT: Landfill siting and design guidelines or regulations differ from state to state. Most include hydrogeological criteria, referring to hydraulic conductivities, aquifers, ground water flow patterns, contaminant travel times, and distance between landfill and sensitive targets for contaminants, etc. However, almost all of the existing hydrogeological guidelines are incomplete, inconsistent, or both. The aquitard between landfill and regional aquifer frequently offers less resistance to leachate migration than compliance with regulations may suggest. Residence times of leachate, that makes it through the landfill liner, is often overestimated. Monitoring wells in the regional aquifer are unreliable detectors of local leaks in a landfill. If a landfill does leak, costly aquifer restoration is called for. For traditional landfill designs, ground water monitoring considerations suggest the siting over homogeneous sand and gravel aquifers, rather than over complex till environments. An alternative landfill design criterion is suggested, which is based on a negative hydraulic gradient underneath the landfill. This design guarantees ground water protection, simplifies landfill monitoring, and generally enhances the landfill economy. 相似文献
17.
Roukaya Bouyakhsass Soukaina Bouaouda Abdeslam Taleb Abdelaziz Madinzi Michel Baudu Salah Souabi 《环境质量管理》2023,32(4):237-246
The estimation of leachate quantities produced in landfills is necessary to dimension the treatment plants allowing to reduce the polluting load of these effluents and consequently avoid their negative impacts on the environment. Different leachate quantification methods were used in this study to assess the leachate volume produced at the Oum Azza landfill. The water balance method give comparable estimations of leachate production to the Ouled Berjal landfill ratio. The first method showed average values between 487 and 495 m3/day for 2015, 2018, and 2019, and at the same time, the second method gave values between 470 and 477 m3/day for the same years. In contrast, the World Bank ratio showed high values that vary between 2260 and 2295 m3/day for 2015, 2018, and 2019. The on-site data and the statistical analysis showed us that the World Bank ratio is not adapted for the estimation of the leachates produced in Oum Azza landfill, while the water balance and the ratio of Ouled Berjal landfill allowed to give comparable results to reality. 相似文献