DO和C/N值对一体化OCO工艺脱氮除磷的影响

Influence of DO and C/N Ratio on Nitrogen and Phosphorus Removal by Integrated OCO Process with Center-island Settling Tank

以模拟生活污水为处理对象,研究了DO浓度和进水C/N值对中心岛式一体化OCO工艺脱氮除磷的影响。结果表明:当好氧区的DO浓度控制在2.0 mg/L左右时,缺氧区和厌氧区的DO浓度较易控制在反硝化和释磷所需的生化环境,对TN和TP均能达到较好的去除效果,去除率分别为85%和94%;随进水C/N值的增加,对TN的去除率先升高后降低,而对TP的去除率先升高后趋于稳定,对TN和TP的去除效果均在进水C/N值为8.5左右时最理想,去除率分别为85%以上和94%,当C/N值>8.5时,对TP的去除率基本保持在93%以上。

The influence of DO and influent C/N ratios on nitrogen and phosphorus removal by the integrated OCO process with center-island settling tank was investigated using the simulated domestic sewage. The results showed that when DO in aerobic zone was about 2.0 mg/L, DO in the anoxic zone and anaerobic zone was easy to be controlled in the biochemical environment required by denitrification and phosphorus release, and the maximum average removal rates of TN and TP were 85% and 94% respectively. The removal rate of TN increased first and then decreased with the increase of the C/N ratio, and the optimal removal rate of TN was 85% when the C/N ratio was about 8.5. The removal rate of TP increased first and then tended to be stable with the increase of the C/N ratio, the optimal removal rate of TP was 94% when the C/N ratio was about 8.5, and when the C/N ratio was more than 8.5, the removal rate of TP was maintained at more than 93 %.