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.
餐厨垃圾湿法厌氧处理的污泥流变性特征及其成因
- Title:
- Rheological Characteristics of Sludge from Wet Anaerobic Digestion of Kitchen Waste and Its Causes
- Keywords:
- kitchen waste; wet anaerobic digestion; sludge rheology
- 摘要:
- 餐厨垃圾厌氧处理的污泥流变性是影响厌氧处理反应器混合能耗的重要因素，但是污泥浓度影响流变性的机制尚不明确。为此，采集北京市某餐厨垃圾综合处理厂的湿法厌氧处理污泥，考察了污泥粒径分布、溶解态有机物组分和温度等因素对污泥流变性的影响。结果表明，升温对污泥上清液和TS含量为2%~6%的污泥流变性起到了促进作用，升温可使颗粒物水解成小分子有机物，从而导致流变性增强。当TS≤2%时，污泥的流变性主要由溶解态有机物贡献，芳香类蛋白质Ⅱ转化为芳香类蛋白质Ⅰ导致屈服应力τ0降低；当TS≥4%时，污泥流变性主要由颗粒物贡献，屈服应力τ0提高而稠度指数k降低，粒径分布较稳定；当温度>80 ℃时，蛋白质变性导致屈服应力τ0明显升高，但稠度指数k明显降低。
- 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.
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