LI Yu-bin,LI Shu-hua.A Renovation Design Case of the A2O Biochemical Tank Transformed from BIOLAK Tank without Water Interruption[J].China Water & Wastewater,2020,36(20 20):129-132.
A Renovation Design Case of the A2O Biochemical Tank Transformed from BIOLAK Tank without Water Interruption
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
20 20
Page:
129-132
Column:
Date of publication:
2020-10-17
- Keywords:
- wastewater treatment plant; renovation without water interruption; A2O process; precast component
- Abstract:
- The design treatment capacity of a wastewater treatment plant in Changchun City is 30 000 m3/d, the original biochemical process adopted BIOLAK treatment technology, and the original designed effluent water quality was the first level B standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). Due to the higher effluent water quality standard required to meet the first level A standard, it was needed to upgrade the plant. The wastewater treatment process operation could not be stopped, and the existing biochemical tank needed to be modified. In this design, precast concrete components were spliced into walls to separate the BIOLAK tank into anaerobic zone, anoxic zone and aerobic zone. BIOLAK tank was transformed into A2O biochemical tank. Precast concrete foundation was adopted to reconstruct and install submersible mixers. It was proved feasible by the upgrading and reconstruction project, which not only met the requirements of process operation, but also proved that the structure of precast concrete components was stable and reliable. After the completion of the upgrading and reconstruction project, actual operation results showed that the effluent quality could stably meet the first level A standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).
Last Update:
2020-10-17