低温下碳源对同步硝化反硝化的影响

为了提高生物脱氮效率,采用序批式生物反应器(SBR)处理模拟废水。在pH=7.0—8.5、温度10—15℃、溶解氧(DO)为3—5 mg/L、污泥浓度(MLSS)为(3 500±200)mg/L、ρ(NH4+-N)为50—70 mg/L条件下,分别考察蔗糖、醋酸钠和乙醇作为碳源对SBR工艺同步硝化反硝化(SND)脱氮效果和胞外聚合物(EPS)的影响。结果表明,蔗糖作为碳源时,当进水COD为370 mg/L时,COD去除率达到86%,SND率为88.3%,ρ(EPS)为659 mg/L;当醋酸钠作为碳源时,COD去除率达83.9%,SND率为68.8%,ρ(EPS)为742 mg/L;当乙醇作为碳源时,COD去除率仅为72.8%,SND率为58%,ρ(EPS)为736 mg/L。与醋酸钠和乙醇相比,蔗糖更适合作为低温下SBR工艺同步硝化反硝化的碳源。

Effect of carbon sources on simultaneous nitrification and denitrification at low temperature

A sequence batch reactor(SBR) was employed to treat the simulated wastewater in order to improve the efficiency of biological denitrification.With sucrose,sodium acetate and alcohol as carbon sources respectively,the effect of carbon sources on the simultaneous nitrification and denitrification(SND) efficiency and extracellular polymeric substances(EPS) was investigated under the condition of pH = 7.0-8.5,dissolved oxygen(DO) 3-5 mg/L,MLSS(3 500±200)mg/L and ρ(NH4+-N) 50-70 mg/L at 10-15 ℃.The results show that when sucrose is used as carbon source,and in the condition of influent COD 370 mg/L,COD removal efficiency and SND efficiency are 86% and 88.3%,respectively,and ρ(EPS) is 659 mg/L;when sodium acetate and alcohol are used as carbon sources respectively,the removal efficiencies of COD are 83.9% and 72.8%,SND efficiencies are 68.3% and 58%,and ρ(EPS) are 742 and 736 mg/L,respectively.It indicates that sucrose is more suitable for a carbon source than sodium acetate and alcohol at low temperature in simultaneous nitrification and denitrification system using SBR process.