碳磷比对新型后置缺氧工艺脱氮除磷的影响探究

以人工合成废水为对象,探究了进水C/P对新型后置缺氧工艺脱氮除磷效率的影响,结果表明,当COD/ρ(SOP)由35/1降低至15/1时,COD去除影响不明显,但TN及SOP的去除率均呈现下降趋势。C/P下降促进污泥体系中EPS的产生。C/P降低抑制了NH₄⁺-N好氧硝化与缺氧反硝化。COD/ρ(SOP)由35/1下降至15/1,厌氧释磷量和厌氧释磷速率分别由(37.3±0.5)mg/L和(8.5±0.4)mg/(g·h)下降至(28.1±1.8)mg/L和(5.1±0.8)mg/(g·h)。C/P下降降低了厌氧期PHA的合成,从而导致后续氧化分解产能不足。COD/ρ(SOP)为35/1时,30℃为新型后置缺氧工艺营养盐去除的适宜温度。

Effect of Carbon and Phosphorus Ratio on Nitrogen and Phosphorus Removal by New Type of Post-anoxia Process

In order to explore the effect of influent C/P on the efficiencies of nitrogen and phosphorus removal by a new type of post-anoxic process,the synthetic wastewater was taken as the research object.The removal efficiency of C/P on COD,TN and dissolved phosphate(SOP) was analyzed by controlling the influent C/P with different mass ratios.The influence mechanism of C/P on the new post-anoxic process was revealed by the change of extracellular polymers(EPS) content and the change of nutrient and polyhydroxyalkanoates(PHA) content in typical cycles.Furthermore,the effect of temperature on nutrient removal efficiency of the new post-anoxic process was investigated under optimal C/P condition.The results showed that,when COD/ρ(SOP) was decreased from 35/1 to 15/1,the effect of COD removal was not obvious,but the removal efficiencies of TN and SOP both showed a downward trend.The decrease in C/P promoted the production of EPS in the sludge system.C/P reduction inhibited NH₄⁺-N aerobic nitrification and anoxic denitrification.In addition,the COD/ρ(SOP) decreased from 35/1 to 15/1,the anaerobic phosphorus release rate was(37.3±0.5) mg/L,and the anaerobic phosphorus release rate was(8.5±0.4) mg/(g·h),which decreased to 28.1±1.8 mg/L,the corresponding rate of phosphorus release was(5.1±0.8) mg/(g·h).The decrease in C/P reduced the synthesis of PHA during the anaerobic phase,resulting in insufficient capacity for subsequent oxidative decomposition.When COD/ρ(SOP) was 35/1,30 ℃ was the optimum temperature for nutrient removal in the new post-anoxia process.