蛋白酶/热压力处理对污泥脱水性的影响

比较不同处理方式对污泥脱水性能及蛋白质提取效率的影响。通过热压力、蛋白酶、热压力-蛋白酶3种方式对机械脱水污泥进行处理。结果表明，在65℃、75℃热压力（3MPa、6MPa、9MPa）下，与原污泥相比蛋白质提取量平均增加41.74%、65.64%；热压力处理后污泥脱水性改善不明显。胃蛋白酶添加量为0.04g/g TSS时，蛋白质提取量最高为108.52mg/g TSS，污泥毛细吸水时间（CST）为最小值154s。65℃热压力（3MPa、6MPa、9MPa）-胃蛋白酶、中性蛋白酶处理后，蛋白质提取量与热压力污泥相比分别提高了38.5%和35.8%；75℃、85℃热压力（3MPa、6MPa、9MPa）-木瓜蛋白质酶处理后，蛋白质提取量均达到220mg/g TSS以上；热压力-胃蛋白酶在75℃，6MPa脱水效果最好，毛细吸水时间为170s。

Effects of protease and thermal pressure treatment on dewatering of sludge

The dewaterability and protein extraction efficiency of mechanical dewatered sludge was studied under three different treatment methods including thermal pressure, protease and thermal pressure-protease. Compared with the original sludge, the amount of average protein extraction increased by 41.74% and 65.64% under the thermal pressure (3MPa、6MPa、9MPa) of 65℃ and 75℃. The improvement of sludge dewaterability was not obvious after thermal pressure treatment. When pepsin was added to 0.04g/g TSS, the amount of protein extraction reached 108.52mg/g TSS, and the capillary sunction time (CST) was 154s. Compared with the thermal pressed sludge, the amount of protein extraction increased by 38.5% and 35.8% respectively after the treatment at 65℃ thermal pressure (3MPa、6MPa、9MPa) -pepsinase and neutral protease. The amount of protein extraction reached more than 220mg/g TSS after the treatment at 75℃ and 85℃ thermal pressure (3MPa、6MPa、9MPa) -papain protease. Thermal pressure-pepsin treatment, the sludge had the best dewatering performance at 75℃、6MPa, and the capillary sunction time was 170s.