Improving Thermal Dewatering Characteristics of Mechanically Dewatered Sludge: Response Surface Analysis of Combined Lime-Heat Treatment
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Date
2011
Authors
Tunçal, Tolga
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
In this study, disintegration of dewatered sludge (dry solids content [DS%] = 23 +/- 2) was studied to assess the possibility of enhancing the overall performance of a thermal dewatering processes. Powdered lime was used as an alkaline disintegrator. The combined effects of drying temperature, powdered lime dosage, and organic content on the thermal drying rate of dewatered sludge were investigated in a full-scale wastewater treatment plant. Effects of selected design parameters on the sludge drying rate were modeled using a response surface method. In addition, the possible interaction between lost on ignition and total organic carbon parameters also was investigated statistically. Specific resistance to filtration and free water contents of raw and disintegrated mixed sludge (DS% = 1.0 to 1.8) samples were compared statistically. The obtained results indicated that all of the selected design parameters have a significant effect on thermal dewatering characteristics, and the alkaline disintegration technique could remarkably improve thermal evaporation rate of dewatered sludge. These results are important because they could help to establish a sustainable sludge management model, which is critical in reducing environmental health risks. Water Environ. Res., 83, 405 (2011).
Description
Keywords
dewatered sludge, response surface method, Box-Behnken design, total organic carbon, specific resistance to filtration, free water content, Waste Activated-Sludge, Sewage-Sludge, Ultrasonic Treatment, Dewaterability, Disintegration, Digestion, Biosolids
Journal or Series
Water Environment Research
WoS Q Value
Q3
Scopus Q Value
Q2
Volume
83
Issue
5
