膜分离技术在垃圾渗滤液处理中的研究与应用

膜分离技术处理垃圾渗滤液在国外已经成熟,国内近年来也已经开始应用.系统地阐述了国内外膜分离技术在垃圾渗滤液中的研究与应用,分析了膜分离技术在垃圾渗滤液处理中的优势和不足,对膜分离技术在未来垃圾渗滤液处理中的发展前景进行了展望.     

垃圾渗滤液处理工艺技术的研究

针对垃圾渗滤液的组成及性质,研究当前垃圾渗滤液处理工艺和技术的发展和应用,通过分析渗滤液有机物浓度,对比各种渗滤液处理工艺,优化处理效果,并进行处理工艺的技术经济评价,为渗滤液处理技术的发展提供必要的科学依据。     

碟管式反渗透（DTRO）处理垃圾渗滤液的工程实例

介绍了生活垃圾填埋场渗滤液的产生、特点以及目前国内外几种主流垃圾渗滤液处理工艺,分析从处理技术效果和投资因素两方面来考虑,DTRO工艺在当前渗滤液处理中的应用。重点介绍了某县垃圾渗滤液处理工程中的具体应用,并总结了工程经验及其得出的结果。     

垃圾焚烧发电厂渗滤液处理工艺新思路

本文对我国垃圾焚烧电厂渗滤液处理工艺现状及垃圾焚烧电厂渗滤液特性进行了综述分析,并提出垃圾焚烧电厂渗滤液处理工艺新思路。垃圾焚烧做为一种处理城市生活垃圾的有效方式,其相关环保设施的建设在运行中出现的问题能否得到有效解决成为垃圾发电产业健康发展的重要因素;该渗滤液成本复杂、处理难度大、工程运行不稳定;新工艺mvr蒸发＋好氧处理工艺,更有效的解决电厂环保问题,达到处理简单化,污泥最小化。     

城市垃圾填埋场渗滤液处理研究

根据处理工艺原理的不同，分别介绍生化和物化处理技术、膜处理技术、土地处理技术等处理工艺研究与应用的进展情况，并首次提出垃圾渗滤液的减量法处理。同时根据我国填埋场渗滤液的产生特点和处理处置现状，展望了我国渗滤液处理工艺的发展趋势。     

垃圾渗滤液处理厂的建设

本文介绍垃圾渗滤液的来源及特性,指出了垃圾渗滤液是一种成分复杂,处理难度大的污水,并对现行的一些处理工艺进行了解,站在投资者的角度考虑投资方式,分析垃圾渗滤液处理厂建设需注意的细节,降低投资的风险。     

垃圾渗滤液对污水处理厂运行的影响

垃圾渗滤液是一种成分复杂的高浓度有机废水。以厦门市前埔污水处理厂为例,对垃圾渗滤液接入城市污水处理厂合并处理存在的问题进行探讨。将垃圾渗滤液直接排入污水处理厂进行合并处理会对污水处理厂处理工艺造成冲击,给污水处理厂的运行管理带来困难,且将增加污水处理运行成本。     

垃圾渗滤液处理工艺综述

垃圾渗滤液是垃圾填埋过程中产生的高浓度有机废水,难于处理.简要归纳垃圾渗滤液水质特征,综述垃圾渗滤液的主要处理技术,包括生物法和物理化学法以及近年来发展迅速的光催化技术、电解处理技术等新型处理技术.     

小议垃圾填埋场渗滤液回灌处理意义

垃圾填埋场的渗滤液可能会通过土壤、气体和水体等渠道产生二次污染，是危害及其严重的有机废水，所以垃圾填埋场有必要积极采用各种措施加大对渗滤液的处理力度。本文介绍了渗滤液回灌处理技术，并总结了垃圾填埋场渗滤液回灌处理的意义及处理过程中应注意的问题。     

垃圾填埋场脱氮技术研究进展

垃圾填埋法是我国城市垃圾处置的主要方法。随着我国城市化进程的推进，城市垃圾以年均8-10％的增长率迅速增加。在垃圾填埋的过程中，由于雨雪等降水对填埋场中垃圾的侵蚀、淋洗，产生了一种高污染、难治理的渗滤液，渗滤液包含了大量高浓度的有机及无机污染物，如腐殖酸、重金属、氨氮等有毒有害物质。其中氨氮的浓度较高，我国城市垃圾填埋场渗滤液中氨氮浓度通常为1500-2000mg／L，老龄垃圾填埋场渗滤液甚至高达5000mg／L，明显高于发达国家，因此渗滤液中氨氮的去除已成为当今我国环境工作者的研究热点。     

Treatment of MSW landfill leachate by a thin gap annular UV/H2O2 photoreactor with multi-UV lamps

The treatment of leachate from landfills is a major disposal problem for municipal solid waste. The leachate is generally recalcitrant to be treated according to complicated characteristics and high color intensity resulting further threat for environment and human health. In this work, the designed thin gap annular photoreactor with 4-UV lamps in UV/H2O2 process was proposed to decolor and remove chemical oxygen demand (COD) from the landfill leachate for solving this environmental problem. Meanwhile, the operating parameters such as UV dosage, hydrogen peroxide concentration and leachate strength were evaluated. The landfill leachate treated with the maximum dosage of 4-UV lamps and 232.7 mM of hydrogen peroxide concentration achieved 72 and 65% of color and COD removal efficiencies in 300 min. As for less concentrated leachate of 20% strength, 91% of color and 87% of COD were removed within only 120 min. From the experimental results, the UV/H2O2 process in this work was an effective pre-treatment or treatment technology for landfill leachate.     

超滤-纳滤膜处理垃圾填埋场渗沥液

运用锯齿膜超滤加两级卷式膜纳滤分离系统处理垃圾渗沥液，系统出水无色透明，COD总去除率99％以上，氨氮总去除率90％以上，达到国家一级排放标准．结果表明：膜法处理垃圾渗沥液的技术是切实可行的．     

COD fractions of leachate from aerobic and anaerobic pilot scale landfill reactors

One of the most important problems with designing and maintaining a landfill is managing leachate that generated when water passes through the waste. In this study, leachate samples taken from aerobic and anaerobic landfill reactors operated with and without leachate recirculation are investigated in terms of biodegradable and non-biodegradable fractions of COD. The operation time is 600 days for anaerobic reactors and 250 days for aerobic reactors. Results of this study show that while the values of soluble inert COD to total COD in the leachate of aerobic landfill with leachate recirculation and aerobic dry reactors are determined around 40%, this rate was found around 30% in the leachate of anaerobic landfill with leachate recirculation and traditional landfill reactors. The reason for this difference is that the aerobic reactors generated much more microbial products. Because of this condition, it can be concluded that total inert COD/total COD ratios of the aerobic reactors were 60%, whereas those of anaerobic reactors were 50%. This study is important for modeling, design, and operation of landfill leachate treatment systems and determination of discharge limits.     

Advanced treatment of landfill leachate by a new combination process in a full-scale plant

Advanced treatment of mature landfill leachate from a municipal landfill located in southern China (Jiangmen) was carried out in a full-scale plant using a new process. The combined process has a sequencing batch reactor (SBR) serving as the primary treatment, with polyferric sulfate (PFS) coagulation coupled with a Fenton system as secondary treatment, and a pair of upflow biological aerated filters (UBAFs) in parallel as tertiary treatment. The overall removal efficiency of chemical oxygen demand (COD) in this process was 97.3%, with an effluent COD less than 100 mg/L. Up to 99% ammonia (N–NH₃) removal efficiency was achieved in the SBR, with an effluent of less than 3 mg/L, which meets the discharge standard (≤25 mg/L) with only primary treatment. The total phosphorus (TP) and suspended solids (SS) in the final effluent were reduced to less than 1 mg/L and 10 mg/L, respectively. The experience gained in the operation and maintenance will lead to a more stable performance of this combined process. An economic analysis shows that the overall operating cost of the advanced treatment was $2.70/m³. This new combination process was proved to be highly compatible and efficient in a small-scale landfill leachate treatment plant and is recommended for small-scale landfill leachate treatment plants.     

Impact of various leachate recirculation regimes on municipal solid waste degradation

Landfilled municipal solid waste can be treated by introducing leachate into the waste matrix. Increasing attention is being given to landfill leachate recirculation as a means for in situ leachate treatment and landfill stabilization. Landfills with leachate recirculation may be operated as municipal solid waste bioreactor treatment system rather than as a conventional waste dumping sites. In order to study the impact of various leachate recirculation regimes on municipal solid waste degradation, two landfill-simulating reactors, one with leachate recycle and one without, were constructed and placed at a constant room temperature (34 degrees C). Both reactors were filled with a municipal solid waste mixture representing the typical solid waste composition determined for the city of Istanbul. For the purpose of this experiment, leachate recirculation volume and frequency were changed periodically. This research showed that increased frequency of leachate recirculation accelerates the stabilization rate of waste matrix. About 2l of recirculated leachate and four times per week recirculation strategy were found to provide the highest degree of waste stabilization. Additionally, this research confirmed that leachate recirculation is a very feasible way for in situ leachate treatment.     

Metal concentrations of simulated aerobic and anaerobic pilot scale landfill reactors

Leachate and solid waste samples from aerobic and anaerobic simulated landfill reactors operated with and without leachate recirculation were characterized in terms of metals such as Fe, Ca, K, Na, Cd, Cr, Cu, Pb, Ni, and Zn. Metal concentrations of aerobic landfill reactor leachate samples are always below the regulation limits. The higher concentrations in anaerobic landfill leachate samples decreased to regulation limits after the landfill becomes methanogenic. The effect of leachate recirculation is determined in anaerobic landfills more clearly than aerobic landfills. Metal precipitation resulted in a decrease in leachate metal content and an increase in solid waste metal content as expected. Result of the study show that the metal content of landfill leachate samples is not a major concern for both aerobic and anaerobic landfills.     

Landfill leachate treatment: Review and opportunity

In most countries, sanitary landfilling is nowadays the most common way to eliminate municipal solid wastes (MSW). In spite of many advantages, generation of heavily polluted leachates, presenting significant variations in both volumetric flow and chemical composition, constitutes a major drawback. Year after year, the recognition of landfill leachate impact on environment has forced authorities to fix more and more stringent requirements for pollution control. This paper is a review of landfill leachate treatments. After the state of art, a discussion put in light an opportunity and some results of the treatment process performances are given. Advantages and drawbacks of the various treatments are discussed under the items: (a) leachate transfer, (b) biodegradation, (c) chemical and physical methods and (d) membrane processes. Several tables permit to review and summarize each treatment efficiency depending on operating conditions. Finally, considering the hardening of the standards of rejection, conventional landfill leachate treatment plants appear under-dimensioned or do not allow to reach the specifications required by the legislator. So that, new technologies or conventional ones improvements have been developed and tried to be financially attractive. Today, the use of membrane technologies, more especially reverse osmosis (RO), either as a main step in a landfill leachate treatment chain or as single post-treatment step has shown to be an indispensable means of achieving purification.     

Simultaneous phosphate and CODcr removals for landfill leachate using modified honeycomb cinders as an adsorbent

In this study, honeycomb cinders were employed to remove phosphate and Chemical Oxygen Demand (COD(cr)) simultaneously for landfill leachate treatment. Operating conditions of honeycomb cinders pretreatment, pH, temperature, honeycomb cinders dosage, reaction time, and settling time, were evaluated and optimized. The results revealed that the removal efficiencies of both phosphate and COD(cr) could be increased up to 99.9% and 66.7% under the optimal conditions, respectively. Moreover, the structures of raw/modified honeycomb cinders and resulting precipitates were detected by Scanning Electron Microscope (SEM), Energy Dispersive Spectrometers (EDS) analysis and X-ray Diffraction (XRD). The results suggested that the adsorption method using honeycomb cinders might be an effective strategy as a pretreatment technology for landfill leachate treatment.     

Influence of leachate recirculation on aerobic and anaerobic decomposition of solid wastes

In this study, the effect of leachate recirculation on aerobic and anaerobic degradation of municipal solid wastes is determined by four laboratory-scale landfill reactors. The options studied and compared with the traditional anaerobic landfill are: leachate recirculation, landfill aeration, and aeration with leachate recirculation. Leachate quality is regularly monitored by the means of pH, alkalinity, total dissolved solids, conductivity, oxidation-reduction potential, chloride, chemical oxygen demand, ammonia, and total Kjeldahl nitrogen, in addition to generated leachate quantity. Aerobic leachate recirculated landfill appears to be the most effective option in the removal of organic matter and ammonia. The main difference between aerobic recirculated and non-recirculated landfill options is determined at leachate quantity. Recirculation is more effective on anaerobic degradation of solid waste than aerobic degradation. Further studies are going on to determine the optimum operational conditions for aeration and leachate recirculation rates, also with the operational costs of aeration and recirculation.