UCT工艺进水COD浓度与C/N对除磷效果的影响

在UCT工艺中,进水COD浓度和C/N是影响其运行效果的重要因素.为考察这种影响,试验设计UCT工艺在不同C/N和进水COD浓度联合作用下运行,研究了其中对反硝化除磷和总体除磷效果的影响.结果表明,当C/N15时,较高的COD进水浓度促进异养菌的生长而使厌氧反应器释磷作用降低,C/N20时,由于TN浓度降低抑制了异养菌的增殖,厌氧释磷速率随COD浓度的升高基本保持上升趋势;在进水COD350 mg/L时,缺氧反应器内反硝化吸磷作用明显,COD350mg/L之后反应器内以释磷为主,当进水COD350 mg/L时,进水C/N为10～20对反硝化吸磷的促进较明显,且随着比值的增加促进作用逐渐减小;在进水COD浓度为250～450 mg/L范围内,各初始C/N都能保持80%以上较稳定的TP去除率.

Influent COD and C/N Ratio on Phosphorus Removal of UCT System

UCT is deeply influenced by COD and C/N ratios. To check this infection, the UCT system was designed to run at variety of influent COD and C/N ratios. The results show that: when the influent C/N ratio is lower than 15, the high influent concentration of COD increases the proliferation of heterotrophic bacteria and decreases the phenomenon release rate. When the influent C/N ratio is higher than 20, the low influent concentration of TN decreases the proliferation of heterotrophic bacteria, the phenomenon release rate rise with the increase of COD. When the influent concentration of COD is lower than 350 mg/L, the phenomenon of denitrifying phosphorus-uptake is very remarkable. The phenomenon release is remarkable when the influent concentration of COD is higher than 350 mg/L. When the influent concentration of COD is lower than 350 mg/L, the promotion of C/N ratio which in the range of 10-20 is obvious, and the promotion decreases along with the increase of C/N ratio. The removal efficiency of total phosphorus achieve higher than 80% steadily when the influent concentration of COD in the range of 250-450 mg/L even in different influent C/N ratio.