Influence of sludge solids content on sludge dewaterability using bioleaching

Advances in Environmental Research Pub Date : 2014-09-25 DOI:10.12989/AER.2014.3.3.199

J. Wong, Jun Zhou, Lixiang Zhou, Mayur B. Kurade, A. Selvam

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引用次数: 1

Abstract

Dewatering is an extremely important step in wastewater treatment process to reduce the final sludge volume in order to minimize the cost of sludge transportation and disposal. In the present study, the effect of different sludge solids content (1, 2 and 3.8%) on the dewaterability of anaerobically digested sludge using Acidithiobacillus ferrooxidans and A. thiooxidans was studied. The rate of pH reduction was higher during initial process in the sludge having low solids content, but after 48 h of bioleaching, similar pH of below 3 was observed in all the treatments with different solids content. Bio-oxidation rate of Fe was initially higher in sludge with low solids content, but complete oxidation was observed within 60 h in all the three treatments. Compared to the control, specific resistance to filtration was reduced by 75, 78 and 80% in the sludge with a solids content of 1, 2 and 3.8% respectively, showing improvement in dewaterability with an increase in sludge solids content. Sludge effluent quality and sludge settling rate were also improved in treatments with higher solids content after the bioleaching process.

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污泥固体含量对生物浸出污泥脱水性能的影响

脱水是污水处理过程中一个极其重要的步骤，它可以减少最终污泥的体积，从而最大限度地降低污泥的运输和处置成本。在本研究中，研究了不同污泥固体含量(1、2和3.8%)对氧化亚铁硫杆菌和氧化亚铁硫杆菌厌氧消化污泥脱水性能的影响。污泥固含量较低时，初期pH降低速率较高，但经过48 h的生物浸出后，不同固含量处理的pH值基本都在3以下。在固体含量较低的污泥中，铁的生物氧化率最初较高，但三种处理均在60 h内完全氧化。与对照相比，固体含量为1、2和3.8%的污泥的过滤比阻力分别降低了75%、78%和80%，表明随着污泥固体含量的增加，脱水性能有所改善。采用高固相含量的生物浸出工艺，污泥出水水质和污泥沉降率均有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advances in Environmental Research

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