【摘要】 针对浓缩污泥自热好氧消化存在单位容积有机质含量低，难以达到自热升温目标，而脱水污泥好氧堆肥供氧传质差、发酵臭味大、二次污染严重等问题，测定了不同含固率污泥黏度变化曲线，选定黏度过渡区的3种不同含固率污泥，采用纯氧和空气曝气对比自热消化，考察污泥序批式消化效果。结果表明，污泥黏度随含固率的变化呈指数增大，含固率为6%～9%的污泥黏度处在渐变和突变之间的过渡段；当进泥含固率为7.01%～8.79%时，纯氧比空气曝气所达最高消化温度提高4.2～5.8℃，VS去除率增加8.64%～14.12%，其中污泥含固率为7.99%时消化温度最高、VS去除率最大。相比于传统污泥自热好氧消化，采用处于黏度过渡区的污泥进行纯氧曝气自热消化，可以使供氧均匀性、进泥含固率和产热效果显著增加，臭气产量和消化池体积显著降低。更多还原

【Abstract】 The autothermal aerobic digestion of concentrated sludge has low organic matter content per unit volume, making it is difficult to achieve the goal of autothermal and temperature rise. In addition,aerobic composting of dehydrated sludge has the problems such as poor oxygen supply and mass transfer,strong fermentation odor and serious secondary pollution. This paper measured the viscosity curve of sludge with different solid contents, selected three kinds of sludge with different solid contents in the viscosity transition zone, compared the autothermal digestion aerated by pure oxygen and air, and investigated the performance of sequential batch digestion of sludge. The viscosity of sludge increased exponentially with the change of solid content, and the viscosity of sludge with solid content of 6%-9%was in the transition zone between gradual change and abrupt change. When the solid content of sludge was in the range of 7.01%-8.79%, the maximum temperature of digestion with pure oxygen aeration was 4.2-5.8 ℃ higher than that of air aeration, and the VS removal rate was 8.64%-14.12% higher. When the solid content of sludge was 7.99%, the digestion temperature and VS removal rate were the highest.Compared with the traditional sludge autothermal aerobic digestion, the autothermal digestion of sludge with pure oxygen aeration in the viscosity transition zone significantly increased the uniformity of oxygen supply, solid content of sludge and heat generation performance, and significantly reduced the odor production and digester volume.更多还原