Enhanced Sb(V) removal from sulfate-rich wastewater by anaerobic granular sludge: Role of AQS-loaded iron sludge-derived hydrochar

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-21 DOI:10.1016/j.jwpe.2025.108366

Qi Li , Yanping Zhu , Xiong Zheng , Yinguang Chen , Hongying Yuan , Nan Jiang , Mengying Yan , Manhong Huang

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Abstract

Antimony(V) (Sb(V)) and high concentrations of sulfate are commonly present in Sb mine drainage and Sb-containing textile wastewater. To address this challenge and achieve resource utilization, this study utilized iron sludge as a raw material. AQS-loaded iron sludge-derived hydrochar (HCQ) was synthesized via hydrothermal carbonization followed by sodium anthraquinone-2-sulfonate (AQS) loading. The study investigated the impact of sulfate on Sb(V) removal by anaerobic granular sludge (AnGS) and evaluated the role of HCQ in mitigating this effect. The findings confirmed that sulfate significantly inhibited Sb(V) removal by AnGS. However, the addition of HC or HCQ markedly enhanced Sb(V) removal rates, which were 3.29 and 3.65 times higher than the sulfate-inhibited control (S + Sb group), respectively. Notably, the removal rate in the HCQ + S + Sb group exceeded that in the HC + S + Sb group. Crucially, effluent Sb(III) concentrations were negligible in HCQ group. Mechanistic insights revealed that: (1) The surface-loaded AQS on HCQ inhibited sulfate reduction, thereby freeing electron donors and favoring Sb(V) removal. (2) The HC component stimulated AnGS to produce soluble microbial products (SMP), which alleviated sulfate inhibition and further enhanced Sb(V) removal. Thus, AQS and HC in HCQ acted synergistically to promote Sb(V) bioreduction. Additionally, HCQ improved Sb(V) adsorption within extracellular polymeric substances (EPS) and enhanced the INT-ETS activity of AnGS, both contributing to the improved performance. Finally, HCQ altered the bacterial community structure, specifically increasing the relative abundance of Chloroflexi, a phylum associated with Sb(V) reduction.

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厌氧颗粒污泥强化富硫酸盐废水中Sb(V)的去除：aqs负载铁污泥衍生烃类的作用

锑(V) （Sb(V)）和高浓度硫酸盐通常存在于锑矿废水和含锑纺织废水中。为了解决这一挑战并实现资源利用，本研究以铁污泥为原料。采用水热炭化法，负载蒽醌-2-磺酸钠（AQS），合成了负载AQS的铁污泥衍生碳氢化合物（HCQ）。研究了硫酸盐对厌氧颗粒污泥（AnGS）去除Sb(V)的影响，并评估了HCQ在缓解这一影响方面的作用。结果证实硫酸盐对AnGS去除Sb(V)有明显的抑制作用。而添加HC或HCQ可显著提高Sb(V)的去除率，分别是硫酸盐抑制对照组（S + Sb组）的3.29倍和3.65倍。值得注意的是，HCQ + S + Sb组的去除率高于HC + S + Sb组。关键是，HCQ组出水Sb（III）浓度可以忽略不计。机理分析表明：(1)HCQ表面负载的AQS抑制硫酸盐还原，从而释放电子给体，有利于Sb(V)的去除。(2) HC组分刺激AnGS生成可溶性微生物产物（SMP），减轻了硫酸盐抑制作用，进一步增强了Sb(V)的去除。因此，HCQ中的AQS和HC协同作用，促进Sb(V)的生物还原。此外，HCQ改善了细胞外聚合物（EPS）对Sb(V)的吸附，增强了AnGS的inet - ets活性，均有助于提高AnGS的性能。最后，HCQ改变了细菌群落结构，特别是增加了与Sb(V)还原相关的Chloroflexi门的相对丰度。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies