LIUYan,YUJun,YANGZhong-qi,et al.Design of Pure MBBR Process Retrofitting Project for a Micro-polluted Water Treatment Plant[J].China Water & Wastewater,2022,38(6):107-112.
Design of Pure MBBR Process Retrofitting Project for a Micro-polluted Water Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第6期
Page:
107-112
Column:
Date of publication:
2022-03-17
- Keywords:
- micro-polluted water; river treatment; suspended carrier; biofilm; pure MBBR; horizontal flow sedimentation tank
- Abstract:
- The original process of a micro-polluted water treatment plant in South China with a total treatment capacity of 260×104 m3/d needs to be upgraded in order to improve the river water quality. The core control effluent index is ammonia nitrogen. By comparing the applicability of biological aerated filter, rotating biological disk, bio?contact oxidation, and pure MBBR to reduce ammonia nitrogen in micro?polluted water, and considering the quality of influent and effluent, the cost of investment, operation and maintenance, and the difficulty of construction, the pure MBBR process was selected to retrofit the micro?polluted water treatment plant. A part of the sedimentation tank was transformed into a pure MBBR zone. The influence of different types of hydraulic tank on the flow pattern of suspended carrier is analyzed. After retrofitted by side inlet and side outlet micro-dynamic mixing tank type, the effluent quality remains stable, the ammonia nitrogen concentration is less than 0.5 mg/L, and the TP removal rate remains 81% under the shortened hydraulic retention time, which is superior to the discharge standard. Even if the influent volume exceeded the standard for a long time, the effluent quality of effluent remained stable, which shows a strong impact load resistance. The pure MBBR process has simple route, occupies a small area, and has low investment, operation and maintenance costs, which is suitable for new construction or expansion and retrofitting of micro?polluted water tresatment plants.
Last Update:
2022-03-17