污水污泥和造纸污泥干燥特性的对比研究

Contrastive and experimental study on drying characteristics of sewage sludge and papermaking sludge

采用4种不同温度（30℃、70℃、102℃、130℃）及4种不同体表比（1．62cm^2·g^-1、2．16cm^2·g^-1、3．24cm^2·g^-1、6．48cm^2·g^-1）的污泥样品，对比研究了污水污泥和造纸污泥的干燥特性。结果表明：恒温干燥的温度越高，样品的比表面积越大，干燥时间越短。污泥失水率在10％之前，处于快速干燥阶段；污泥失水率在10％～60％之间，处于恒速干燥阶段；污泥失水率在大于60％时，处于降速干燥阶段。各阶段，污水污泥的失水速率比造纸污泥小0．01％·s^-1左右。

Sewage sludge and papermaking sludge samples with different surface ratios （1.62, 2.16, 3.24 and 6.48 cm^2·g^-1） and different temperatures （30, 70, 102 and 130~C） were analyzed through experiment on their drying characteristics. The results indicated that the higher the temperature and the surface ratio were, the less time was used for sludge drying. When the water loss was less than 10%, the sludge was in the fast drying phase; when the water loss was between 10%-60%, the sludge was in the constant drying phase; when the water loss was more than 60%, the sludge was in the reduced drying phase. In each drying phase, the water loss rate of sewage sludge was 0.01%·s^-1 less than that of papermaking sludge.