Treatment of Concentrated Leachate by Coagulation and Fly Ash Absorption

2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring Pub Date : 2011-04-11 DOI:10.1109/CDCIEM.2011.285

Zhan Shengli, L. Dan, Zhou Qibin, Sun Yongliang, L. Yiqing

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引用次数: 3

Abstract

The concentrated leach ate of the Chengdu Leach ate Treatment Plant was collected as a subject of case study. It was a very dark coloured liquid possessing high COD, very low BOD5 and low ammonia nitrogen concentration. The combination of coagulation and fly ash absorption was used to treat the concentrated leach ate in this study. The effects of pH, coagulant dosage and settling time on COD removal in coagulation process were investigated by single-factor and orthogonal experiments. Results showed that the optimum value was approximately pH 5, aluminium sulfate dosage 1.5g and settling time 50min. The influence of operating factors followed the order: coagulant dosage£¾pH£¾ settling time. Fly ash absorption experiments were performed after finishing the surface modification of fly ash in acid condition. The effects of pH, fly ash dosage and stirring time on COD removal were also studied by single factor. Results showed that the optimum value was about pH5, fly ash dosage 2.5g and stirring time 2.5h. After finishing the final step of fly ash absorption, the overall remova1 rate of COD was above 80%.

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混凝-粉煤灰吸附法处理浓渗滤液

以成都浸出液处理厂的浓缩浸出液为研究对象。它是一种颜色很深的液体，COD很高，BOD5很低，氨氮浓度很低。采用混凝与粉煤灰吸附相结合的方法处理浓浸出液。通过单因素试验和正交试验研究了混凝过程中pH、混凝剂投加量和沉淀时间对COD去除率的影响。结果表明，最佳pH值约为5，硫酸铝用量为1.5g，沉淀时间为50min。各操作因素的影响顺序为:混凝剂投加量、pH值、沉降时间。在酸性条件下对粉煤灰进行表面改性后，进行了粉煤灰吸附试验。单因素考察了pH、粉煤灰投加量和搅拌时间对COD去除率的影响。结果表明，粉煤灰的最佳掺量为pH5左右，粉煤灰掺量为2.5g，搅拌时间为2.5h。完成最后一步粉煤灰吸附后，COD的总体去除率在80%以上。

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2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

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