Effect of FeCl₃ concentration in chemically enhanced primary treatment on the performance of a conventional wastewater treatment plant. A case study.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-01 Epub Date: 2024-03-12 DOI:10.1080/10934529.2024.2328449

L M Ruiz, A Checa, J I Perez, J M Torre-Marín, A Muñoz-Ubiña, M A Gómez

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Abstract

The effect of coagulant dosage in a chemically enhanced primary treatment (CEPT) on the performance of a conventional wastewater treatment plant (WWTP) has been investigated. Lab-scale experiments simulations were carried out in order to evaluate the effect of coagulant addition on the primary settling performance. In these experiments, FeCl₃ was used as coagulant. Later, the WWTP was theoretically simulated using a commercial software (WEST®) to evaluate the effect of coagulation/flocculation on the global system, based on the results obtained at lab-scale. According to these results, the CEPT modifies the organic matter balance in the WWTP, decreasing the contribution of readily (S_S) and slowly (X_S) biodegradable fractions of COD to the aerobic biological process up to 27.3% and 80.8%, respectively, for a dosage of FeCl₃ of 24 mg L^-1. Consequently, total suspended solids in the aerobic reactor and the secondary purged sludge decreased up to 33% and 13%, respectively. However, the influence on effluent quality was negligible. On the contrary, suspended solids concentration in the sludge to be treated by anaerobic digestion increased, mainly regarding the S_s and X_s fractions, which caused an 8.1% increase in biogas production potential, with approximately 60% of CH₄ concentration.

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化学强化一级处理中氯化铁浓度对传统污水处理厂性能的影响。案例研究。

研究了化学强化一级处理（CEPT）中混凝剂投加量对传统污水处理厂（WWTP）性能的影响。为了评估投加混凝剂对初级沉淀性能的影响，我们进行了实验室规模的模拟实验。在这些实验中，FeCl3 被用作混凝剂。随后，使用商业软件（WEST®）对污水处理厂进行了理论模拟，以评估混凝/絮凝对整个系统的影响。根据这些结果，CEPT 改变了污水处理厂的有机物平衡，降低了 COD 的易生物降解部分（SS）和慢生物降解部分（XS）对好氧生物过程的贡献率，在 FeCl3 的用量为 24 mg L-1 时，分别达到 27.3% 和 80.8%。因此，好氧反应器和二次净化污泥中的总悬浮固体分别减少了 33% 和 13%。然而，这对出水水质的影响微乎其微。相反，通过厌氧消化处理的污泥中的悬浮固体浓度增加了，主要是 Ss 和 Xs 部分，这导致沼气生产潜力增加了 8.1%，CH4 浓度增加了约 60%。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.