ZHANG Hui-wen,DAI Xiao-xuan,JIANG Wei,et al.Reduction and Water Forms of Municipal Sludge Treated by Hydrothermal Reaction[J].China Water & Wastewater,2021,37(7):96-100.
市政污泥的水热反应减量化及水分赋存形态研究
- Title:
- Reduction and Water Forms of Municipal Sludge Treated by Hydrothermal Reaction
- Keywords:
- municipal sludge; hydrothermal treatment; reduction; water form; hydrogen
- 摘要:
- 针对市政污泥处理处置受难脱除的高水分含量制约的现状，基于水热技术可越过高能耗的脱水工艺实现高效减量化的效果，开展了水热反应中市政污泥减量化及水分赋存形态研究，从效果和机理角度明确了水热技术处理市政污泥可实现高效减量化。结果表明：水热反应温度达到500 ℃时，市政污泥减量率达到87.60%，有机质的去除率达到62.7%；市政污泥中赋存的水分形态在水热升温过程经过细胞胞内水分释放、固相残留含水率降低、固相产物脱水性能改善等三个阶段；水热技术在控制过氧比为0.2时具备最优的处理效果和经济优势。
- Abstract:
- The current disposal of municipal sludge is restricted by high water content which is hard to be removed. As hydrothermal treatment technology can realize efficient sludge reduction over dewatering process with high energy consumption, reduction of municipal sludge and water forms in the hydrothermal reaction were explored, and the effective reduction of municipal sludge treated by hydrothermal technology was clarified from the perspective of performance and mechanism. When the hydrothermal treatment reaction temperature was controlled at 500 ℃, the mass of municipal sludge was reduced by 87.60%, and the removal efficiency of organic matter reached 62.7%. Reduction of municipal sludge included 3 stages during hydrothermal treatment process, namely release of intracellular water, reduction of solid residue water content and improvement of solid phase product dewatering performance. The hydrothermal technology had the best treatment performance and economic benefit when the oxide ratio was controlled at 0.2.
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