Low-cost physicochemical treatment for removal of ammonia, phosphate and nitrate contaminants from landfill leachate

S. Morris, Guiomar Garcia-Cabellos, D. Ryan, D. Enright, A. Enright
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引用次数: 11

Abstract

Abstract Four low-cost materials, oyster shells, pumice stone, sand and zeolite were employed as adsorbents in an adsorption batch assays investigating the removal of ammonia, phosphate and nitrate from an aqueous solution. These compounds were chosen as they represent typical compounds found in landfill leachate (LFL). Assay performance was evaluated by the Langmuir and Freundlich adsorption isotherms. The top two materials, oyster shells and pumice stone, were employed as adsorbents in a fixed-bed column trial examining the effect of bed height and flow rate on the treatment of a synthetic LFL. The trial concluded that the highest rates of adsorption were achieved using bed heights of 20 cm with a flow rate of 5 mL min−1. After optimization, the system was employed for the treatment of LFL from Powerstown landfill, Carlow, Ireland. Ammonia and nitrate were effectively removed by both adsorption materials resulting in a reduction of influent ammonia and nitrate concentrations to below the national discharge limits set for these compounds of ≤4 mg L−1 and ≤50 mg L−1, respectively. In contrast, although similar high removal efficiencies were observed for phosphate, these rates were not maintained during the test period with overall results indicating reduced phosphate adsorption in comparison to the other compounds tested.
低成本物理化学处理去除垃圾渗滤液中的氨、磷酸盐和硝酸盐污染物
摘要:采用牡蛎壳、浮石、沙子和沸石四种低成本材料作为吸附剂,对水溶液中氨、磷酸盐和硝酸盐的去除进行了批量吸附试验。选择这些化合物是因为它们代表了垃圾渗滤液(LFL)中发现的典型化合物。采用Langmuir吸附等温线和Freundlich吸附等温线评价分析效果。在固定床柱试验中,以牡蛎壳和浮石为吸附剂,考察了床高和流量对处理合成LFL的影响。试验得出结论,当床高为20 cm,流速为5 mL min - 1时,吸附率最高。经优化后,该系统用于处理爱尔兰卡洛市Powerstown垃圾填埋场的LFL。两种吸附材料都能有效去除氨和硝酸盐,从而将进水氨和硝酸盐浓度分别降至≤4 mg L - 1和≤50 mg L - 1的国家排放限值以下。相比之下,尽管观察到类似的高磷酸盐去除效率,但在测试期间这些速率并没有保持,总体结果表明与其他测试化合物相比,磷酸盐吸附减少。
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