新型调理剂CTB-2污泥堆肥的氧气时空变化特征研究

Temporal-spatial distribution of oxygen during sewage sludge CTB-2 amendment composting

采用新型CTB-2调理剂与城市污泥进行堆肥,研究了堆肥过程中氧气、温度的时空变化特征。结果表明,m(CTB-2调理剂)∶m(污泥)=1∶2能够有效降低污泥容重,改善堆体结构;堆体能够快速升温至高温期并持续7 d以上,最终完成无害化;采用该比例的调理剂能够保证堆体的通风供氧,使堆体各层通风后的氧气体积分数都恢复至19%以上,最低氧气体积分数维持在数17%以上;堆肥过程中堆体的氧气体积分数、耗氧速率和温度都具有明显的层次效应,堆体耗氧速率呈先升高后降低的趋势,堆体通风后的氧气和最低氧气体积分数均随着堆肥的进行而增加。

This paper studied the sewage sludge composting using a novel compost amendment （CTB-2）. Results showed that CTB-2 amendment could significantly reduce the bulk density of the sewage sludge When the ratio of CTB-2 to sewage sludge was 1：2, composting process was significantly improved, while the ventilation and oxygen supply of the pile were ensured while the structure was properly adjusted. The pile reached hemophilic stage in 2 days and completed sanitary in 12 days. Oxygen content, consumption rate and temperature in the pile were obvious differed between layers. The oxygen consumption rate increased in the beginning of composting, and fell quickly after the maximum consumption rate achieved. The minimum oxygen content and oxygen contents after aeration increased with composting. After aeration, the oxygen content increased to above 19% （ v/v ）, which help maintain a smooth aerobic environment of composting.