Paper Title:
Use of Combined NaOH-Microwave Pretreatment for Enhancing Mesophilic Anaerobic Digestibility of Thickened Waste Activated Sludge
  Abstract

A combined NaOH-microwave (MW) pretreatment process was studied in order to investigate the effects of NaOH-MW pretreated thickened waste activated sludge (TWAS) on anaerobic digestion. In the NaOH-MW pretreatment studies, Uniform design was successfully applied to determine the relationship of TWAS solubilization to environmental conditions (NaOH dose, target temperature, and MW holding time) and to establish the mathematical model describing the solubilization degree to changes in these variables. The maximum solubilization ratio (85.1%) of volatile suspended solids (VSS) could be achieved at 210°C with 0.2 g-NaOH/g-SS and 35 min holding time. The biochemical methane potential (BMP) tests showed that all digesters fed with pretreated TWAS improved the methane production compared to control system, and the optimal conditions, at 170°C with 0.05 g-NaOH/g-SS and 1 min holding time, were suggested for NaOH-MW pretreatment of TWAS. In spite of the increase in the soluble chemical oxygen demand concentration and decrease in the dewaterability of digested sludge, the semi-continuous reacter fed with the pretreated TWAS without neutralization was stable and gave higher organics reductions and methane yields compared to the control.

  Info
Periodical
Advanced Materials Research (Volumes 113-116)
Edited by
Zhenyu Du and X.B Sun
Pages
459-468
DOI
10.4028/www.scientific.net/AMR.113-116.459
Citation
Y. Z. Chi, Y. Y. Li, M. Ji, H. Qiang, H. W. Deng, Y. P. Wu, "Use of Combined NaOH-Microwave Pretreatment for Enhancing Mesophilic Anaerobic Digestibility of Thickened Waste Activated Sludge", Advanced Materials Research, Vols. 113-116, pp. 459-468, 2010
Online since
June 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Liang Guo, Xiao Ming Li, Yi Zhou, Zong Lian She
Chapter 5: Frontiers of Environment Engineering and Materials
Abstract:In order to promote the hydrolysis and disintegration of waste sludge, the most logical approach is pretreatments to disrupt the microbial...
2903
Authors: S.X. Zhou, Y.P. Dong, Y.L. Zhang
I. Advanced Manufacturing Technology and Equipment
Abstract:Microbial pretreatment was applied to enhance biogas production from corn stover through solid-state anaerobic digestion, but the price of...
326
Authors: De Dong Sun, Hua Mei Liang, Chun Ma
Chapter 8: Waste Disposal and Recycling
Abstract:The effect of sulfate radical(SO4−•) pretreatment on mesophilic anaerobic digestion of sewage sludge was investigated and compared with a...
3358