Newly isolated lysozyme-producing strain Proteus mirabilis sp. SJ25 reduced the waste activated sludge: Performance and mechanism.

Jun Shi, Junfeng Su, Amjad Ali, Liang Xu, Huan Yan, Lindong Su, Zening Qi

Journal: Bioresource technology 2022;358():127392

PMID: 35640815

Full Text on Elsevier Science View on PubMed

Abstract

To promote aerobic digestion of sludge, a lysozyme-producing strain was screened and identified as Proteus mirabilis sp. SJ25. The results of response surface methodology (RSM) showed that at the temperature of 30.8 °C, pH of 6.69, and the inoculum amount of 2.81%, the sludge reduced by 26.58%. Compared with the control group, the removal efficiency of suspended solids (SS) from sludge in the experimental group increased by 14.60%, the release of soluble chemical oxygen demand (SCOD) increased by 2.21 times, and the release of intracellular substances increased significantly. Actinobacteriota, Chloroflexi, Proteobacteria, Bacteroidota, and Firmicutes were the main phyla involved in the sludge reduction process. Strain SJ25 enhanced the degradation rate of sludge by releasing lysozyme lysis to lyse bacteria, enhancing the metabolism and membrane transport of carbohydrates and amino acids. This study provides a new perspective in the field of efficient degradation of waste sludge.

Address: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China. Electronic address: [email protected].; Xi'an Yiwei Putai Environmental Protection Co., Ltd., Xi'an 710055, China.

DOI: 10.1016/j.biortech.2022.127392

Link outs

Subscription / membership required

Full Text Sources:

https://linkinghub.elsevier.com/retrieve/pii/S0960...

MeSH Terms: Bacteria, Mirabilis, Muramidase, Proteus mirabilis, Sewage, Waste Disposal, Fluid