Enhancement of batch waste activated sludge digestion by microwave pretreatment

被引：81

作者：

Eskicioglu, Cigdem ^{[1
]}

Kennedy, Kevin J. ^{[1
]}

Droste, Ronald L. ^{[1
]}

机构：

[1] Univ Ottawa, Dept Civil Engn, Ottawa, ON K1N 6N5, Canada

来源：

WATER ENVIRONMENT RESEARCH | 2007年 / 79卷 / 11期

关键词：

anaerobic batch sludge digestion; microwave; pretreatment; solubilization; BMP;

D O I：

10.2175/106143007X184069

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Batch anaerobic digesters were used to stabilize microwave (MW)-irradiated waste activated sludge (WAS). A low temperature range (50-96 degrees C) MW irradiation was applied. Effects of pretreatment temperature (T) and intensity (1), concentration (C) and percentage of sludge pretreated (PT) were investigated in a multilevel factorial statistical design containing 54 mesophilic batch reactors by monitoring cumulative biogas production (CBP). Variance analysis (ANOVA) determined that the most important factors affecting WAS solubilization were temperature, intensity, and sludge concentration. Improvements in CBP from WAS were significantly affected by sludge percentage pretreated, temperature, and concentration. Pretreatment resulted in 3.6 +/- 0.6 and 3.2 +/- 0.1 fold increases in soluble to total chemical oxygen demand (SCOD/TCOD) at high and low sludge concentrations, respectively. WAS, microwaved to 96 degrees C, produced the greatest improvement in CBP with 15 +/- 0.5 and 20 +/- 0.3% increases over controls after 19 d of digestion at low and high WAS concentrations. Dewaterability of microwaved sludge was enhanced after anaerobic digestion.

引用

页码：2304 / 2317

页数：14

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