Study on the Flow Patterns Characteristic of Modified Carrousel Oxidation Ditch by Adjusting Working Conditions and Enhanced Nitrogen Removal Technology at Low-Temperature
In this study, carrousel oxidation ditch was used aiming to solve the common problems in the normal operating conditions, such as sludge deposition, low nitrogen removal rate at low-temperature and considerably huge energy consumption, whose treatment capacity was 10000m /d. Three experimental conditions were designed and such factors as flow profile, treatment effect and energy consumption were analyzed under different conditions in the oxidation ditch. The results showed that: in the optimal working conditions, with three aeration wheels in operation, the indicators for effluent quality namely COD and NH3-N can meet the first level of B criteria, which could ensure the dissolved oxygen environment about simultaneous nitrification and denitrification in the main ditch of oxidation ditch, consequently the nitrogen removal capacity of the system can be enhanced. After optimization, the effluent quality can meet the first level B criteria steadily. Additionally, with the area of sludge deposition zone reduced, energy consumption required for the safe operation of oxidation ditch was also reduced, with the power density being reduced from 29.61 W/m3 to 18.87W/m3.
Carrousel oxidation ditch flow patterns dissolved oxygen nitrogen removal energy saving.
Chi Zhang Zhi Zhang Bolin Li Xinyi Xiang Hua Chai
Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongq
国际会议
三峡
英文
385-388
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）