Anaerobic digestion of thickened waste activated sludge after microwave enhanced advance oxidation pretreatment

IF 1 Q4 ENGINEERING, ENVIRONMENTAL Journal of Environmental Engineering and Science Pub Date : 2023-10-10 DOI:10.1680/jenes.22.00073
Sarah Ries, Ping Liao, Donald Mavinic, Victor Lo
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Abstract

A microwave-enhanced advanced oxidation process (MW-AOP) was used to treat thickened waste secondary sludge prior to anaerobic digestion (AD). A large amount of soluble chemical oxygen demand (SCOD) and volatile fatty acids (VFAs) was formed in the solution after pretreatment. Both single- and two-phase systems loaded up to 18.2 g volatile solids/(l day) while achieving high methane production, as well as high overall treatment efficiency. Both the upflow anaerobic blanket reactor and the continuous stirred tank reactor could operate at very short hydraulic retention times as short as 2 days without any evidence of souring. The results indicated that an acid reactor in the two-phase system was not required, due to very high levels of SCOD and VFAs produced in the MW-AOP-pretreated solution. As such, a single AD should be able to handle this easily biodegradable substrate following microwave pretreatment.
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微波强化深度氧化预处理后浓缩废活性污泥的厌氧消化
采用微波强化深度氧化工艺(MW-AOP)对浓缩后的废二次污泥进行厌氧消化(AD)处理。预处理后的溶液中形成大量的可溶性化学需氧量(SCOD)和挥发性脂肪酸(VFAs)。单相和两相系统均可负载高达18.2 g挥发性固体/(l天),同时实现高甲烷产量和高整体处理效率。上流式厌氧毯式反应器和连续搅拌槽式反应器都可以在很短的水力停留时间(短至2天)内运行,没有任何酸化的迹象。结果表明,由于mw - aop预处理溶液中产生了非常高的SCOD和VFAs,因此不需要在两相系统中使用酸性反应器。因此,在微波预处理后,单个AD应该能够处理这种易于生物降解的底物。
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来源期刊
CiteScore
1.60
自引率
0.00%
发文量
20
审稿时长
12 months
期刊介绍: Journal of Environmental Engineering and Science is an international, peer-reviewed publication providing a forum for the dissemination of environmental research, encouraging interdisciplinary research collaboration to address environmental problems. It addresses all aspects of environmental engineering and applied environmental science, with the exception of noise, radiation and light.
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