Fostering nature-based solutions and circular approaches in biogas purification: validation of digestate centrate nitrified by intensified multi-stage constructed wetlands as electron acceptor in anoxic biodesulphurisation

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-07-17 DOI:10.1016/j.biortech.2025.133012

Rubén Hervás-Martínez, Núria Oliver, Tatiana Montoya, Feliu Sempere

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Abstract

Anoxic biodesulphurisation using a biogenic nitrified source as an electron acceptor is a potential alternative to aerobic H₂S biotreatment. This work reports the successful combination of nitrified centrate obtained from innovative constructed wetlands (CWs) with anoxic suspended biomass bioreactors (SBBs) treating real biogas. The quality of the liquid medium on the biodesulphurisation process was evaluated. The SBBs (of 48 L and 130 L, respectively) shifted seamlessly from using nitrified centrate from activated sludge to nitrified centrate from CWs, but its low orthophosphate content did limit H₂S removal. To overcome this limitation, raw centrate was supplied. When nitrate + nitrite and orthophosphate concentrations were above 10 mgN L⁻¹ and 10 mgP L⁻¹, 92 % of the H₂S was removed in SBB1 (H₂S elimination capacity (EC) of 3.0 gH₂S Nm⁻³h⁻¹), and 95 % in SBB2 (H₂S-EC of 13.1 gH₂S Nm⁻³h⁻¹) at a gas residence time of 4.0 min and 3.1 min respectively.

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在沼气净化中培育基于自然的解决方案和循环方法：强化多级人工湿地硝化的沼液浓缩液在缺氧生物脱硫中作为电子受体的验证

使用生物硝化源作为电子受体的缺氧生物脱硫是好氧H2S生物处理的潜在替代方案。这项工作报道了从创新人工湿地（CWs）获得的硝化浓缩液与缺氧悬浮生物质生物反应器（SBBs）成功结合处理真正的沼气。对生物脱硫过程中液体介质的质量进行了评价。sbb（分别为48 L和130 L）从使用活性污泥的硝化浓缩液无缝转换为使用化粪池的硝化浓缩液，但其低正磷酸盐含量确实限制了H2S的去除。为了克服这一限制，提供了原始浓缩物。当硝酸盐+亚硝酸盐和正磷酸盐浓度分别大于10 mgN L−1和10 mggp L−1时，SBB1 （H2S消除能力（EC）为3.0 gH2S Nm−3h−1）和SBB2 （H2S-EC为13.1 gH2S Nm−3h−1）的H2S去除率分别为92%和95%，气体停留时间分别为4.0 min和3.1 min。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.