Effects of protease and thermal pressure treatment on dewatering of sludge

doi:10.16085/j.issn.1000-6613.2019-1084

Abstract

Abstract: 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.

Key words: sludge, thermal pressure treatment, protease, protein extraction efficiency, dewaterability

摘要： 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。

关键词: 污泥, 热压力, 蛋白酶, 蛋白质提取效率, 脱水性

CLC Number:

X705

LI Xueshen, WANG Cijia, WANG Kangni, WANG Weiyun. Effects of protease and thermal pressure treatment on dewatering of sludge[J]. Chemical Industry and Engineering Progress, 2019, 38(s1): 201-208.

李学绅, 王词稼, 王康妮, 王伟云. 蛋白酶/热压力处理对污泥脱水性的影响[J]. 化工进展, 2019, 38(s1): 201-208.

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