不同通风量对农村污泥生物干化的影响研究

Study on the Effect of Different Ventilation Rates on the Biodrying of Rural Sludge

摘要: 为实现农村污泥的减量化和资源化，采用了自主设计的农村污泥生物干化试验装置，以啤酒糟为调理剂，研究了不同通风量对农村污泥生物干化的影响效果，设3个试验堆体，采用10 min开/20 min关的间歇通风方式，其通风量分别为1.0、1.5和1.9 L/(min.kg干物质)，试验周期为18 d，测定了堆体温度(平均温度、积累温度)、水分(含水率、水分去除量)、挥发性固体(VS)、pH、O₂和CO₂等指标，研究结果表明，当采用10 min开/20 min关的间歇通风方式，通风量为1.5 L/(min.kg干物质)时生物干化效果较理想，此时有利于堆体温度的升高、水分的去除以及VS的降解，同时发现在生物干化过程中不必对堆体的pH进行调整。

Abstract: In order to achieve the reduction and resource utilization of rural sludge, a self-designed rural sludge biodrying experimental device was adopted, with beer lees as a bulking agent. The effect of different ventilation rates on rural sludge biological drying was studied. Three experimental piles were set up, and an intermittent ventilation mode of 10 min on/20 min off was adopted, with ven-tilation rates of 1.0, 1.5, and 1.9 L/(min. kg dry matter), respectively. The experimental period was 18 days. The temperature (average temperature and accumulation temperature), moisture content (moisture content and moisture removal amount), volatile solids (VS), pH, O₂, and CO₂ were measured. The research results showed that the best drying effect was achieved when the ventila-tion rate was 1.5 L/(min. kg dry matter), which was conducive to the increase of reactor tempera-ture, removal of moisture, and degradation of VS. At the same time, it was found that the pH of the reactor did not need to be adjusted during the biodrying process.