PENGJin-yu,LIZhen-bang,ZHANGKun-qian,et al.Application of Pre-ozone and Biological Fluidized Bed in Updating and Transformation of Waterworks[J].China Water & Wastewater,2024,40(12):94-100.
Application of Pre-ozone and Biological Fluidized Bed in Updating and Transformation of Waterworks
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第12期
Page:
94-100
Column:
Date of publication:
2024-06-17
- Keywords:
- ozone catalytic oxidation; biological fluidized bed; 2-methylisobornyl alcohol; dissolved organic carbon (DOC); particulate matter
- Abstract:
- In order to enhance water quality and comply with Standards for Drinking Water Quality (GB 5749-2022), the ozone catalytic oxidation and biological fluidized bed process was constructed before the conventional process at a waterworks in Shandong, with water treatment capacity of 4×104 m3/d. After the operation of the new process, the concentrations of 2-methylisoborneol (2-MIB) and geosmin (GSM) in the filter effluent were reduced to below the detection limit. Ammonia nitrogen was reduced to within 0.02 mg/L, and dissolved organic carbon (DOC) was reduced to 2.7 mg/L. Notably, the additional process contributed 88.8% to the removal of DOC, and high-throughput sequencing revealed the presence of microorganisms such as Gemmatimonas on the biological fluidized bed. Regarding turbidity and particulate matter, the total particle matter amount in the sedimentation effluent decreased from 15 959 CNT/mL before the retrofit to 4 963 CNT/mL, and the formed flocs had a three-dimensional dense structure. The total particle matter amount in the filtered water further decreased to 416 CNT/mL, and turbidity decreased to 0.08 NTU, resulting in a comprehensive improvement of supply water quality, and the process exhibited stability during continuous operation. This demonstrates the design concept of proactively removing organic matter is effective in this waterworks, which not only efficiently removes 2-MIB, DOC, and ammonia nitrogen, but also enhances the coagulation and destabilization efficiency, and strengthens removal effect of turbidity and particulate matter in the subsequent conventional treatment process.
Last Update:
2024-06-17