Improved methanogenesis from aqueous pyrolysis liquid (APL) by inoculum selection and pre-ozonation†

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Saba Seyedi, Kaushik Venkiteshwaran and Daniel Zitomer
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Abstract

Aqueous pyrolysis liquid (APL) from municipal wastewater solids (WWS) pyrolysis has a high chemical oxygen demand and diverse organics (N-heterocyclic, aromatic, and phenolic compounds) that can potentially introduce hazardous chemicals to the environment or result in disposal expenses. Therefore, new APL management and energy recovery strategies would be beneficial. The anaerobic degradability of APLs originating from WWS pyrolyzed at 500 and 700 °C was investigated under varying pre-ozonation conditions and by using four distinct inocula. The 700 °C APL was more toxic to anaerobic microorganisms in batch anaerobic toxicity assays and pre-ozonation decreased the toxicity as demonstrated by increased subsequent methane production rates (10–55% increase). The 500 °C APL did not show toxicity under the conditions tested and ozonation had limited impact on subsequent methane production. Microbial communities of two of the inocula demonstrated small shifts during APL digestion compared to the other two, suggesting potential acclimation of the initial inoculum to APL-like constituents. This study highlights that both APL pre-ozonation and type of inocula can significantly affect the anaerobic toxicity response to APL. While anaerobic treatment of municipal wastewater-derived APL is viable, pyrolysis temperature, organic loading rates, pretreatment and microbial community composition play important roles in biogas production.

Abstract Image

Abstract Image

通过接种物选择和预臭氧处理提高水基热解液(APL)的产甲烷能力
城市污水固体(WWS)热解产生的水热解液(APL)具有较高的化学需氧量和多种有机物(N-杂环化合物、芳香族化合物和酚类化合物),可能会将有害化学物质带入环境或导致处理费用。因此,新的 APL 管理和能源回收战略将大有裨益。在不同的预氮化条件下,使用四种不同的接种体,研究了在 500 ℃ 和 700 ℃ 高温下热解的 WWS 所产生的 APL 的厌氧降解性。在批量厌氧毒性试验中,700 °C的APL对厌氧微生物的毒性更大,而预臭氧处理可降低毒性,这一点可通过随后甲烷生产率的提高(提高10-55%)来证明。在测试条件下,500 °C APL 没有显示出毒性,臭氧对随后的甲烷生产影响有限。与其他两种接种物相比,两种接种物的微生物群落在 APL 消化过程中的变化较小,这表明初始接种物可能会适应类似 APL 的成分。这项研究强调,APL 预氮化和接种菌的类型都会对 APL 的厌氧毒性反应产生重大影响。虽然厌氧处理城市污水衍生的 APL 是可行的,但热解温度、有机负荷率、预处理和微生物群落组成对沼气生产起着重要作用。
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
CiteScore
7.20
自引率
4.30%
发文量
567
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