微波辐照对废弃活性污泥水解的非热效应评估。

Evaluation of non-thermal effects by microwave irradiation in hydrolysis of waste-activated sludge.

作者信息

Byun I G, Lee J H, Lee J M, Lim J S, Park T J

机构信息

Institute for Environmental Technology and Industry, Pusan National University, 63beon-gil, Geumjeong-gu, Busan, Korea.

Department of Environmental Engineering, Pusan National University, 63beon-gil, Geumjeong-gu, Busan, Korea E-mail:

出版信息

Water Sci Technol. 2014;70(4):742-9. doi: 10.2166/wst.2014.295.

DOI:10.2166/wst.2014.295

PMID:25116507

Abstract

The activation energy (Ea) for waste-activated sludge (WAS) hydrolysis was compared between microwave irradiation (MW) and conventional heating (CH) methods to evaluate the non-thermal effect of MW. The microwave-assisted hydrolysis of WAS was assumed to follow the first-order kinetics on the basis of volatile suspended solids (VSS) conversion to soluble chemical oxygen demand (SCOD) for different initial VSS concentrations. By comparing the VSS decrement and the SCOD increment between MW and CH at different absolute temperatures of 323, 348 and 373 K, the average ratio of VSS conversion to SCOD was determined to range from 1.42 to 1.64 g SCOD/g VSS. These results corresponded to the theoretical value of 1.69 g SCOD/g VSS based on the assumption that the molecular formula of sludge was C10H19O3N. Consequently, the Ea of the MW-assisted WAS hydrolysis was much lower than that of CH for the same temperature conditions. The non-thermal effect of MW in the hydrolysis of WAS could be identified with the lower Ea than that of CH.

摘要

为评估微波（MW）的非热效应，比较了微波辐射和传统加热（CH）方法下剩余活性污泥（WAS）水解的活化能（Ea）。基于不同初始挥发性悬浮固体（VSS）浓度下VSS转化为可溶性化学需氧量（SCOD）的情况，假定WAS的微波辅助水解遵循一级动力学。通过比较在323、348和373 K不同绝对温度下MW和CH之间的VSS减量和SCOD增量，确定VSS转化为SCOD的平均比例为1.42至1.64 g SCOD/g VSS。基于污泥分子式为C10H19O3N的假设，这些结果与1.69 g SCOD/g VSS的理论值相符。因此，在相同温度条件下，MW辅助WAS水解的Ea远低于CH。MW在WAS水解中的非热效应可通过比CH更低的Ea来识别。