Application of an anaerobic reactor for the treatment of sulfide-rich wastewater using biogas for H2S removal.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Water Science and Technology Pub Date : 2024-12-01 Epub Date: 2024-11-22 DOI:10.2166/wst.2024.383
Takashi Onodera, Yasuyuki Takemura, Masataka Aoki, Kazuaki Syutsubo
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引用次数: 0

Abstract

Anaerobic treatment of sulfur-rich wastewater is challenging because sulfide greatly inhibits the activity of anaerobic microorganisms, especially methanogenic archaea. We developed an internal phase-separated reactor (IPSR) that removed sulfide prior to methanogenesis by gas stripping using biogas produced in the reactor. The IPSR was fed with synthetic wastewater containing a very high sulfide concentration of up to 6,000 mg S L-1 with a chemical oxygen demand (COD) of 30,000 mg L-1. The IPSR was operated at an organic loading rate of 5-12 kg COD m-3 day-1 at 35 °C. The results show that the sulfide concentration was reduced from 6,000 mg S L-1 in the influent to <700 mg S L-1 in the first-stage effluent. The second-stage effluent contained <400 mg S L-1. As a result of effective sulfide removal by its gas stripping function, the IPSR had a COD removal efficiency of >90% over the entire experimental period. High-throughput 16S rRNA gene sequencing revealed that the major anaerobic archaea were Methanobacterium and Methanosaeta, which are frequently found in high-rate anaerobic reactors. Thus, the IPSR maintains these microorganisms and achieves high-process performance even when fed wastewater with very high sulfide concentrations.

应用厌氧反应器处理富含硫化物的废水,利用沼气去除 H2S。
厌氧处理富硫废水具有挑战性,因为硫化物会极大地抑制厌氧微生物的活性,尤其是产甲烷古细菌。我们开发了一种内部相分离反应器(IPSR),利用反应器中产生的沼气进行气提,在产甲烷之前去除硫化物。IPSR 的进料为合成废水,其中硫化物浓度高达 6,000 mg S L-1,化学需氧量 (COD) 为 30,000 mg L-1。IPSR 在 35 °C、有机负荷率为 5-12 kg COD m-3 day-1 的条件下运行。结果表明,硫化物浓度从进水的 6,000 毫克 S L-1 降至第一阶段出水的-1。第二阶段出水中的硫化物浓度为-1。由于 IPSR 具有气体汽提功能,能有效去除硫化物,因此在整个实验期间,IPSR 对 COD 的去除率大于 90%。高通量 16S rRNA 基因测序显示,主要的厌氧古细菌为 Methanobacterium 和 Methanosaeta,它们经常出现在高速厌氧反应器中。因此,即使向硫化物浓度极高的废水进料,IPSR 也能保持这些微生物,并实现高工艺性能。
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来源期刊
Water Science and Technology
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.
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