辅料配比对污泥生物-物理联合干燥的影响

Influence of Accessories Mixing Ratio on Sludge Biophysical Co-Drying

利用自主研制的污泥生物-物理联合干燥反应系统研究了脱水污泥∶树皮∶回流污泥分别为7∶3∶0.5、9∶3∶0.5和12∶3∶0.5时,污泥生物-物理联合干燥过程中温度、含水率等参数的变化规律.结果表明,污泥温度随干燥时间延长先增大后减小,含水率在0～96 h逐渐降低,继续延长反应时间,则变化不明显.当脱水污泥∶树皮∶回流污泥为9∶3∶0.5时,污泥温度迅速升高,在48 h达到3组辅料配比最大值67℃,并在55℃以上保持72 h,而后迅速降低,经过168 h处理后含水率从74.1%降低到61.8%,获得水分去除率最大值43.5%.辅料配比对生物-物理干燥过程具有重要影响,通过向脱水污泥添加适宜配比的辅料,能改善堆体渗透性,有利于快速激发并维持微生物活性,提高干燥过程污泥温度,增强水分去除效果.

Parameters（temperature,water content and so on） in the process of sludge biophysical co-drying were studied in self-made biophysical co-drying reactor.The sludge∶tree bark∶recycled sludge was set as 7∶3∶0.5,9∶3∶0.5,12∶3∶0.5 respectively.The results suggested that sludge temperature first increased then decreased along with drying time,water content decreased in the first 96 h,then had no obvious variability.While sludge∶tree bark∶recycled sludge was 9∶3∶0.5,the temperature of sludge spiraling,received to max 67℃ at 48 h under three different accessories mixture ratio,and was kept for 72 h above 55℃,then spiraling,the final water content of sludge decreased from 74.1% to 61.8%,received the optimal water content removing rate 43.5%.Accessories mixing ratio had important influence on the process of sludge biophysical co-drying,sludge with proper mixing ratio can modify the structure of sludge,improve sludge permeability,arouse and keep microorganic activity,which will enhance sludge temperature and strengthen water content removal rate.