Ultrasonic pretreatment for anaerobic digestion of suspended and attached growth sludges

IF 2.4 4区 环境科学与生态学 Q2 WATER RESOURCES Water Quality Research Journal Pub Date : 2019-11-01 DOI:10.2166/WQRJ.2019.039
P. Roebuck, K. Kennedy, R. Delatolla
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引用次数: 6

Abstract

Anaerobic digestion (AD) is a proven technology for energy production from the stabilization and reduction of sewage waste. The AD and impact of ultrasonic pretreatment of four waste activated sludges (WASs) from conventional and three non-conventional municipal wastewater treatment plants were investigated. WAS from a conventional activated sludge (CAS) system, a rotating biological contactor (RBC), a lagoon, and a nitrifying moving-bed biofilm reactor (MBBR) were pretreated with ultrasonic energies of 800–6,550 kJ/kg total solids to illustrate the impact of sludge type and ultrasonic pretreatment on biogas production (BGP), solubilization, and digestion kinetics. The greatest increase in BGP over the control of pretreated sludge did not coincide consistently with greater sonication energy but occurred within a solubilization range of 2.9–7.4% degree of disintegration and are as follows: 5% ± 3 biogas increase for CAS, 12% ± 9 for lagoon, 15% ± 2 for nitrifying MBBR, and 20% ± 2 for RBC. The effect of sonication on digestion kinetics was inconclusive with the application of modified Gompertz, reaction curve, and first-order models to biogas production. These results illustrate the unique response of differing sludges to the same levels of sonication energies. This article has been made Open Access thanks to the kind support of CAWQ/ACQE (https://www.cawq.ca).
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悬浮污泥和附着污泥厌氧消化的超声预处理
厌氧消化(AD)是一项经过验证的技术,用于稳定和减少污水废物的能源生产。研究了超声波预处理4个常规和3个非常规城市污水处理厂废活性污泥(WASs)的AD及影响。采用超声能量为800-6,550 kJ/kg的总固体对来自传统活性污泥(CAS)系统、旋转生物接触器(RBC)、泻湖和硝化移动床生物膜反应器(MBBR)的WAS进行预处理,以说明污泥类型和超声预处理对沼气产生(BGP)、增溶和消化动力学的影响。与预处理污泥对照相比,BGP的最大增加并不与更大的超声能量一致,而是发生在2.9-7.4%的溶解度范围内,具体如下:CAS增加5%±3沼气,泻湖增加12%±9沼气,硝化MBBR增加15%±2沼气,RBC增加20%±2沼气。将改进的Gompertz模型、反应曲线模型和一阶模型应用于沼气生产,超声对消化动力学的影响尚无定论。这些结果说明了不同污泥对相同声波能量水平的独特响应。感谢CAWQ/ACQE (https://www.cawq.ca)的大力支持,本文已开放获取。
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