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首页> 外文期刊>Journal of Environmental Science and Health >Evaluation of coagulation-flocculation and nanofiltration processes in landfill leachate treatment
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Evaluation of coagulation-flocculation and nanofiltration processes in landfill leachate treatment

机译：垃圾渗滤液治疗中凝血 - 絮凝和纳滤过程的评价

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摘要

Landfill leachate consists mostly of a high content of refractory organic matter, ammonia and toxic compounds. All these compounds, regardless of their nature, have a potential pollution effect on local ground and surface waters. In this context, the purpose of the present study was to evaluate a treatment process (coagulation-flocculation with lime coupled with nanofiltration) applied to landfill leachate from Seropedica, Rio de Janeiro (Brazil). Jar tests were conducted to determine the optimum dosage of lime (ranged from 0 to 10 g L-1) and, at optimum lime dose, ammonia nitrogen was removed during coagulation-flocculation process due to high pH. The process was settled for 6 h with slow stirring (50 rpm) to promote air entrainment and NH3-N stripping before using the final treatment step of nanofiltration at 8 bar. After ammonia stripping, NH3-N was reduced from 1,236 mg L-1 to 353 mg L-1 (71% removal efficiency). At the end of the combined treatment, TOC (total organic carbon), HS (humic substances) and COD (chemical oxygen demand) removals were 89%, 80% and 94%, respectively. The results showed that the combined process was effective in the removal of recalcitrant compounds and NH3-N.
机译：垃圾填埋渗滤液主要由高含量的耐火有机物，氨和有毒化合物组成。所有这些化合物，无论其性质如何，对局部地面和地表水有潜在的污染效果。在这种情况下，本研究的目的是评估应用于来自塞托基卡，里约热内卢（巴西）的垃圾渗滤液的垃圾渗滤液的治疗方法（用纳米滤乱凝聚）。进行罐试验以确定石灰（范围为0至10g L-1）的最佳剂量，并且在最佳石灰剂量下，由于高pH，在凝血 - 絮凝过程中除去氨氮。该方法以缓慢的搅拌（50rpm）沉积6小时，以促进空气夹带和NH3-N，然后在8巴下使用纳米滤滤液的最终处理步骤。在氨汽提后，NH 3-N从1,236mg L-1至353mg L-1（71％除去效率）降低。在结合治疗结束时，TOC（总有机碳），HS（腐殖质）和鳕鱼（化学需氧量）除去分别为89％，80％和94％。结果表明，组合过程在除去醋核化合物和NH3-N中是有效的。

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