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对城市污水污泥、粪渣污泥和造纸污泥进行好氧堆肥试验,以研究不同物料堆肥过程中氧气消耗的动态变化、分布特征及其差异.结果表明,不同污泥堆肥时,耗氧速率和温度具有相似的动态变化阶段.在堆体刚进入高温阶段时,耗氧速率不断升高并达到峰值,之后则逐渐减小并趋于稳定,堆肥结束时的耗氧速率只相当于最大值的1/3～1/15.物料组成影响升温速率、耗氧速率的最大值及达到最大值的时间.有机物含量高时,堆体温度上升快、维持持续高温的时间长.堆体各部位耗氧速率存在差异;中间部位的耗氧速率始终较高,在升温期,上层的耗氧速率略高于下层,此后下层的耗氧速率高于上层.堆体上层和下层的氧气含量在堆肥过程中波动较小(>18%),而中间部位的氧气含量波动较大,在高温阶段其含量较低(约12%).使用无机调理剂(CTB调理剂)时,耗氧速率明显小于使用有机调理剂的处理,供氧所需的通风量减少35.9%;堆体升温较慢,温度变化较平缓.根据研究结果提出了优化通风控制的建议.
The aerobic composting test of urban sewage sludge, waste sludge and papermaking sludge was carried out to study the dynamic changes, distribution characteristics and differences of oxygen consumption during compost composting.The results showed that the oxygen consumption The velocity and temperature have a similar dynamic change phase.When the reactor body just entered the high temperature stage, the oxygen consumption rate increased and peaked, then gradually decreased and stabilized, the oxygen consumption rate at the end of compost was only the largest The value of 1/3 ~ 1 / 15. Material composition affects the heating rate, the maximum oxygen consumption rate and the time to reach the maximum value of organic matter content, the reactor temperature rises quickly to maintain a sustained high temperature for a long time. Oxygen uptake rate in the middle part was always higher than that in the upper part, and oxygen consumption rate in the upper part was slightly higher than that in the lower part during the heating period, During the composting process, the fluctuation was small (> 18%), while the oxygen content in the middle part fluctuated greatly and its content was lower (about 12%) in the high temperature stage. The oxygen consumption rate was obviously higher with inorganic conditioners (CTB conditioners) Less than using organic tone Treatment agent, to reduce the amount of ventilation required for 35.9% oxygen; slowly warmed stack body, the temperature change more gentle ventilation control optimization suggestions based on research results.