Cost-effective evaluation of modified ochre soil and its combination with cationic polyacrylamide for municipal wastewater sludge conditioning.

IF 2.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Water Science and Technology Pub Date : 2025-01-01 Epub Date: 2025-01-11 DOI:10.2166/wst.2025.005

Behzad Aghababaei, Masoud Taheriyoun, Rana Mahdavi Far

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引用次数: 0

Abstract

One of the most costly stages of activated sludge wastewater treatment plants is the treatment and dewatering of waste sludge. Chemical conditioning of sludge, as one of the most widespread methods to enhance sludge dewaterability, accounts for a significant portion of operational expenses due to the consumption of expensive polymeric compounds. This research aims to assess the cost-effectiveness of ochre soil, modified with hydrochloric acid, as an affordable mineral for conditioning waste sludge in an activated sludge system. The optimal conditions for acid modifications are obtained using response surface methodology. Then, its performance is compared with conventional coagulants (ferric chloride and alum) and in combination with cationic polyacrylamide (CPAM). To assess the conditioning process efficiency, the specific resistance to filtration (SRF) parameter was employed. At an optimal dose of modified ochre soil (MOS) equal to 300 (mg/g dry solids), the SRF value decreased from 31.96 to 2.7 Tm/kg. The combination of 100 (mg/gDS) MOS with 0.5 (mg/gDS) CPAM showed as the most cost-effective among the coagulants tested, with a 31% greater SRF reduction compared to CPAM used alone. This study shows the practical efficacy of an eco-friendly natural mineral as a polymer alternative, with the potential for sludge dewatering.

查看原文本刊更多论文

改性赭石土及其与阳离子聚丙烯酰胺复合处理城市污水污泥的经济性评价。

活性污泥废水处理厂最昂贵的阶段之一是废污泥的处理和脱水。污泥的化学调理作为提高污泥脱水性能的最广泛的方法之一，由于消耗昂贵的聚合物化合物，占据了运营费用的很大一部分。本研究旨在评估用盐酸改性的赭石土的成本效益，作为一种负担得起的矿物，用于调节活性污泥系统中的废污泥。利用响应面法确定了酸改性的最佳条件。然后，将其与常规混凝剂（氯化铁和明矾）以及与阳离子聚丙烯酰胺（CPAM）结合使用的性能进行了比较。为了评估调节过程的效率，采用了比过滤阻力（SRF）参数。当改性赭石土（MOS）的最佳剂量为300 （mg/g干固体）时，SRF值从31.96 Tm/kg下降到2.7 Tm/kg。在测试的混凝剂中，100 (mg/gDS) MOS与0.5 (mg/gDS) CPAM的组合是最具成本效益的，与单独使用CPAM相比，SRF降低了31%。这项研究显示了一种生态友好的天然矿物作为聚合物替代品的实际功效，具有污泥脱水的潜力。

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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来源期刊

Water Science and Technology 环境科学-工程：环境

CiteScore

4.90

自引率

3.70%

发文量

366

审稿时长

4.4 months

期刊介绍： Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.