氧化钙促进过量污泥和植物废弃物的厌氧共同消化:性能和机理。

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Water Science and Technology Pub Date : 2024-08-01 Epub Date: 2024-08-05 DOI:10.2166/wst.2024.268
Yongliang Wang, Kang Wang, Xiaohui Zhou, Bin Dai, Daozhong Du
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引用次数: 0

摘要

该研究调查了氧化剂氧化钙(CaO)对中嗜氧厌氧条件下过量污泥(ES)和植物废弃物(PW)协同消化以提高甲烷产量的影响。研究结果表明,氧化钙能显著提高协同消化系统的甲烷产量,最佳氧化钙添加量为 6%时,甲烷产量最高可达 461 毫升/克挥发性固体,约为对照组的 1.3 倍。机理研究表明,氧化钙促进了有机物的分解,提高了可溶性化学需氧量的释放,并增加了可溶性蛋白质和多糖在协同消化基质中的浓度。CaO 的存在有利于挥发性脂肪酸的生成和生物转化,挥发性脂肪酸中较小的羧酸--乙酸的积累效果显著。在 CaO 改良组中,醋酸的比例增加到 32.6-36.9%。酶分析表明,CaO 提高了与 ES 和 PW 密码消化过程相关的水解酶和产酸酶的活性,但抑制了辅酶 F420 的活性。此外,CaO 增加了发酵液中的营养负荷。这项研究为高效利用 ES 和 PW 的资源提供了一种替代方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calcium oxide enhances the anaerobic co-digestion of excess sludge and plant waste: performance and mechanism.

The study investigates the effect of the oxidant calcium oxide (CaO) on the codigestion of excess sludge (ES) and plant waste (PW) under mesophilic anaerobic conditions to enhance methane production. The findings indicate that CaO significantly elevated methane yield in the codigestion system, with an optimum CaO addition of 6% resulting in a maximum methane production of 461 mL/g volatile solids, which is approximately 1.3 times that of the control group. Mechanistic exploration revealed that CaO facilitated the disintegration of organic matter, enhanced the release of soluble chemical oxygen demand, and increased the concentrations of soluble proteins and polysaccharides within the codigestion substrate. The presence of CaO was conducive to the generation and biological transformation of volatile fatty acids, with a notable accumulation of acetic acid, a smaller carboxylic acid within the VFAs. The proportion of acetate in the CaO-amended group increased to 32.6-36.9%. Enzymatic analysis disclosed that CaO enhanced the activity of hydrolytic and acidogenic enzymes associated with the ES and PW codigestion process but suppressed the activity of coenzyme F420. Moreover, CaO augmented the nutrient load in the fermentation liquid. The study provides an alternative scheme for the efficient resource utilization of ES and PW.

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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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