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Physico-chemical treatments for removal of recalcitrant contaminants from landfill leachate

機(jī)譯：物理化學(xué)處理去除垃圾滲濾液中難降解污染物的方法

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摘要

In this paper, the technical applicability and treatment performance of physico-chemical techniques (individual and/or combined) for landfill leachate are reviewed. A particular focus is given to coagulation-flocculation, chemical precipitation, ammonium stripping, membrane filtration and adsorption. The advantages and limitations of various techniques are evaluated. Their operating conditions such as pH, dose required, characteristics of leachate in terms of chemical oxygen demand (COD) and NH3-N concentration and treatment efficiency are compared. It is evident from the survey of 118 papers (1983-2005) that none of the individual physico-chemical techniques is universally applicable or highly effective for the removal of recalcitrant compounds from stabilized leachate. Among the treatments reviewed in this article, adsorption, membrane filtration and chemical precipitation are the most frequently applied and studied worldwide. Both activated carbon adsorption and nanofiltration are effective for over 95% COD removal with COD concentrations ranging from 5690 to 17,000 mg/L. About 98% removal of NH3-N with an initial concentration ranging from 3260 to 5618 mg/L has been achieved using struvite precipitation. A combination of physico-chemical and biological treatments has demonstrated its effectiveness for the treatment of stabilized leachate. Almost complete removal of COD and NH3-N has been accomplished by a combination of reverse osmosis (RO) and an upflow anaerobic sludge blanket (UASB) with an initial COD concentration of 35,000 mg/L and NH3-N concentration of 1600 mg/L and/or RO and activated sludge with an initial COD concentration of 6440 mg/L and NH3-N concentration of 1153 mg/L. It is important to note that the selection of the most suitable treatment method for landfill leachate depends on the characteristics of landfill leachate, technical applicability and constraints, effluent discharge alternatives, cost-effectiveness, regulatory requirements and environmental impact.
機(jī)譯：本文綜述了物理化學(xué)技術(shù)（單個和/或組合）在垃圾滲濾液中的技術(shù)適用性和處理性能。特別關(guān)注凝結(jié)-絮凝，化學(xué)沉淀，銨汽提，膜過濾和吸附。評估了各種技術(shù)的優(yōu)缺點。比較了它們的操作條件，例如pH，所需劑量，滲濾液的化學(xué)需氧量（COD）和NH3-N濃度以及處理效率方面的特性。從對118篇論文的調(diào)查（1983-2005年）中可以明顯看出，沒有任何一種物理化學(xué)技術(shù)能夠普遍適用或非常有效地從穩(wěn)定的滲濾液中去除頑固性化合物。在本文概述的處理方法中，吸附，膜過濾和化學(xué)沉淀是世界上最常應(yīng)用和研究的方法。活性炭吸附和納濾均可有效去除95％以上的COD，COD濃度范圍為5690至17,000 mg / L。使用鳥糞石沉淀已實現(xiàn)了約98％的NH3-N去除，初始濃度為3260至5618 mg / L。物理化學(xué)和生物處理相結(jié)合已證明了其對穩(wěn)定滲濾液的治療效果。通過將反滲透（RO）和上流厭氧污泥層（UASB）組合使用，COD初始濃度為35,000 mg / L，NH3-N濃度為1600 mg / L，幾乎可以完全去除COD和NH3-N和/或RO和活性污泥，初始COD濃度為6440 mg / L，NH3-N濃度為1153 mg / L。重要的是要注意，選擇最合適的垃圾滲濾液處理方法取決于垃圾滲濾液的特性，技術(shù)適用性和限制，廢水排放替代品，成本效益，法規(guī)要求和環(huán)境影響。

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    Kurniawan TA; Lo WH; Chan GYS;

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  • 年度 2006
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  • 正文語種 eng
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