The effect of microbial agent on the protein degradation of sludge biological drying systems
ZHANG Feng1, LI Jun-hua1, LI Ning1,2, SU Ming-xue2
1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China);
2. Hefei Cement Research & Design Institute Corporation Ltd, Hefei 230022, China
Microbial agent EM, microbial agent A, and microbial agent A+EM were used to start the experiment of sludge biological drying systems. The influence of different microbial agents on the degradation of organic matters, especially proteins, during the startup of sludge biological drying systems was exploded. The degree of protein degradation was significantly different in the biodrying systems inoculated with different microbial agents. The protein content of EM group, A group and A+EM group decreased by 25.4%, 20.1%, and 34.2%, and the protein degradation of A+EM group was the most rapid. The efficient protein degradation provided abundant nitrogen sources for microorganisms, which promoted the degradation of polysaccharides and fats in A+EM group with the highest of 63.1% and 30.2%. In addition, the organic matters in A+EM group degraded efficiently, and the humification process of sludge pile showed a retarding trend. Compared with the other two groups, the abundance of thermophilic bacteria (³50℃) was related to the increase of temperature in the A+EM group during the thermophilic period. Especially, the abundance of ammonia-oxidizing bacteria and archaea involved in protein degradation were higher than those in the other two groups. Meanwhile, the results of metabolic pathway analysis indicated the combination of the two microbial agents strengthened tricarboxylic acid, glycolysis, and pentose phosphate cycles. The conversion of protein to ammonia nitrogen and the production and utilization of amino acids such as glucose was aslo promoted by microorganisms, which was one of the important reasons for slowing down the humification process.
张锋, 李军华, 李宁, 苏明雪. 菌剂对污泥生物干化系统蛋白质降解的影响[J]. 中国环境科学, 2023, 43(8): 4065-4079.
ZHANG Feng, LI Jun-hua, LI Ning, SU Ming-xue. The effect of microbial agent on the protein degradation of sludge biological drying systems. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4065-4079.
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