Enhanced anaerobic digestion of waste-activated sludge by thermal-alkali pretreatment: a pilot-scale study.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Water Science and Technology Pub Date : 2024-07-01 Epub Date: 2024-06-17 DOI:10.2166/wst.2024.210
Biqing Li, Yao Tang, Xiannian Xiao, Xia Tang, Dan Luo, Yuxin Liu, Yahui Zhang, Liguo Zhang
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Abstract

The composition of waste-activated sludge (WAS) is complex, containing a large amount of harmful substances, which pose a threat to the environment and human health. The reduction and resource utilization of sludge has become a development demand in sludge treatment and disposal. Based on the technical bottlenecks in the practical application of direct anaerobic digestion technology, this study adopted two different thermal and thermal-alkali hydrolysis technologies to pretreat sludge. A pilot-scale experiment was conducted to investigate the experimental conditions, parameters, and effects of two hydrolysis technologies. This study showed that the optimal hydrolysis temperature was 70 °C, the hydrolysis effect and pH can reach equilibrium with the hydrolysis retention time was 4-8 h, and the optimal alkali concentration range was 0.0125-0.015 kg NaOH/kg dry-sludge. Thermal-alkali combination treatment greatly improved the performance of methane production, the addition of NaOH increased methane yield by 31.2% than that of 70 °C thermal hydrolysis. The average energy consumption is 75 kWh/m3 80% water-content sludge during the experiment. This study provides a better pretreatment strategy for exploring efficient anaerobic digestion treatment technologies suitable for southern characteristic sewage sludge.

通过热碱预处理增强废物活性污泥的厌氧消化:试验规模研究。
废活性污泥(WAS)成分复杂,含有大量有害物质,对环境和人类健康构成威胁。污泥减量化、资源化已成为污泥处理处置的发展需求。基于直接厌氧消化技术在实际应用中的技术瓶颈,本研究采用了两种不同的热水解和热碱水解技术对污泥进行预处理。通过中试规模实验研究了两种水解技术的实验条件、参数和效果。研究表明,最佳水解温度为 70 °C,水解效果和 pH 值可达到平衡,水解停留时间为 4-8 h,最佳碱浓度范围为 0.0125-0.015 kg NaOH/kg 干污泥。热碱联合处理大大提高了甲烷产量,与 70 °C 热水解相比,NaOH 的加入使甲烷产量提高了 31.2%。实验期间的平均能耗为 75 kWh/m3,含水率为 80%。这项研究为探索适合南方特色污水污泥的高效厌氧消化处理技术提供了更好的预处理策略。
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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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