LIANGYu-shuai,WANGKan-hong,XUYu-feng,et al.Rheological Characteristics of Sludge from Wet Anaerobic Digestion of Kitchen Waste and Its Causes[J].China Water & Wastewater,2023,39(13):117-125.
Rheological Characteristics of Sludge from Wet Anaerobic Digestion of Kitchen Waste and Its Causes
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第13期
Page:
117-125
Column:
Date of publication:
2023-07-01
- Keywords:
- kitchen waste; wet anaerobic digestion; sludge rheology
- Abstract:
- The rheology of anaerobic digested sludge is an important factor affecting the mixed energy consumption of anaerobic digester for kitchen waste. However, mechanism of the effect of sludge concentration on rheology is still unclear. In this paper, the sludge from wet anaerobic digestion was collected from a comprehensive kitchen waste treatment plant in Beijing, and the effects of sludge particle size distribution, dissolved organic compounds and temperature on sludge rheology were investigated. Temperature rise promoted the rheology of sludge supernatant and sludge with TS content of 2%-6%, and hydrolyzed particulate matter into small molecular organic matter, resulting in increased rheology. When TS was no more than 2%, the rheology of sludge was mainly contributed by dissolved organic compounds, and the yield stress τ0 was reduced by the conversion of aromatic protein Ⅱ to aromatic protein Ⅰ. When TS was greater than 4%, the rheology of sludge was mainly contributed by particulate matter, the yield stress τ0 increased, the viscosity index k decreased, and the particle size distribution was relatively stable. When the temperature was greater than 80 ℃, the yield stress τ0 increased obviously due to protein denaturation, but the viscosity index k decreased obviously.
Last Update:
2023-07-01