两级生物选择同步除磷脱氮新工艺

针对现有市政污水处理工艺难以兼顾同时生物脱氮除磷的矛盾,结合生活污水低碳氮比的特点,通过在传统的A/O工艺的基础上增设了1个厌氧选择器以提供生物释磷最适宜环境,1个缺氧选择器以避免回流污泥中硝酸盐对厌氧释磷影响以及防止污泥膨胀,开发了一种新型的2级生物选择同步除磷脱氮新工艺.研究表明,应用2级生物选择反硝化除磷脱氮工艺处理生活污水,当进水COD/TN=4.4, COD/TP=33的情况下,稳定期的COD、氨氮、总磷的去除效率分别可达到88%、90%和97%,出水水质达到了国家《城镇污水处理厂污染物排放标准》的一级A标准,反硝化除磷量占总除磷量的35%,并且缺氧段硝酸盐量和缺氧吸磷量成明显的线性关系,平均每消耗1mgNO3--N约吸收1.8mgTP,此线性关系可作为本工艺反硝化除磷的一个重要控制参数.

Bi-bio-selective simultaneous phosphorus and nitrogen removal (BBSPN) novel process

The current municipal wastewater treatment processes are difficult to remove nitrogen and phosphorus simultaneously,especially for domestic wastewater characterized with low C/N.Based on traditional A/O process,a novel Bi-bio-selective simultaneous phosphorus and nitrogen removal(BBSPN) process was developed through adding two-stage biological selectors before A/O process.An anaerobic selector was adopted to provide the most appropriate environment for biological phosphorus release;an anoxic selector was added to avoid nitrate of return sludge influencing phosphorus release and to prevent filamentous bulking.The removal efficiency of COD,ammonia nitrogen and total phosphorus was 88%,90% and 97% in the steady-state under the condition of influent COD / TN = 4.4,COD / TP = 33.The effluent qualities can achieve Grade A standard of ’urban sewage treatment plant emission standards’.Hereto,35% of total phosphorus was removed by denitrifying dephosphatation.Moreover,the linear relationship between nitrate and anoxic phosphorus uptake in anoxic compartment was established.1mg NO3——N consumption corresponds to 1.8mg P-uptake,which can be used as a key controlling parameter for this novel denitrifying dephosphatation process.