城市污泥的高温好氧消化及动力学参数分析

高温好氧消化工艺是稳定化处理污泥的新工艺。文章分别研究了不同污泥类型(初沉泥、二沉泥)分别在高温(45℃、58℃)条件下的稳定化效果及动力学参数。结果表明,在45℃条件下,二沉泥在10d内达到稳定,而初沉泥需要15d;反应温度从45℃提高到58℃有利于二沉泥降解,而不利于初沉泥降解;VSS的动力学拟合曲线相关性好于TSS的拟合曲线。对于不同的污泥类型,二沉泥的拟合曲线相关性高于初沉泥;在相同停留时间条件下,初沉泥的衰减常数kd值随温度的增加而增加;在相同温度条件下,二沉泥kd值不随停留时间的延长而增加,在58℃时二沉泥的kd值还有所下降。说明二沉泥能立即被用作碳源,而初沉泥则不能。

Thermophilic Aerobic Digestion and Kinetics Parameter Analysis of Urban Sewage Sludge

Thermophilic aerobic digestion(TAD) is a novel process that can stabilize and pasteurize municipal sludge.Stabilization effect and kinetic parameter of two kinds of sludge including primary sludge and waste biological sludge were studied at 45℃ and 58℃.Results showed that waste biological sludge can be stabilized in 10days but primary sludge in 15days at 45℃.Temperature raising from 45℃ to 58℃ is benefit to degradation of waste biological sludge but not for primary sludge.Correlation of VSS kinetic fitting curves is better than that of TSS.As for different kinds of sludge,correlation of fitting curves of waste biological sludge is higher than that of primary sludge.On the same detention time,decay constant of primary sludge increased with temperature.Decay constant of waste biological sludge does not increase with the increase of detention time,and decreased at 58℃,which indicated that waste biological sludge can be utilized as carbon source while primary sludge can not.