丙酸的加入对厌氧-低氧同时生物除磷脱氮系统的影响

2个实验室规模的序批式反应器（SBRs）在厌氧-低氧（0.15～0.45 mg·L^-1）条件下运行,以比较丙酸的加入对同时生物除磷脱氮系统的影响.结果表明,无论是丙酸与乙酸的混合酸（碳摩尔比为1.5/1）作为碳源（SBR1）,还是乙酸作为单独碳源（SBR2）,系统都发生同步硝化反硝化和磷的去除（SNDPR）,并且氨氮被全部氧化,系统中没有亚硝酸盐的大量累积.与SBR2相比,SBR1中厌氧阶段磷释放量少,聚羟基戊酸（PHV）合成量高,好氧末磷剩余量少,硝态氮累积少,因此SBR1中总氮和总磷的去除率（分别为68%和95%）比SBR2（分别为51%和92%）高,加入丙酸有助于SNDPR系统保持较好的除磷、脱氮效果.

Addition of Propionic Acid on Simultaneous Biological Phosphorus and Nitrogen Removal in Anaerobic-Low Dissolved Oxygen System

Two lab-scale sequencing batch reactors (SBRs) were operated under conditions of anaerobic-low dissolved oxygen (DO) (0.15 - 0.45 mg x L(-1)), and the influences of addition of propionic acid on simultaneous biological nitrogen and phosphorus removal system were investigated. The results showed that the simultaneous nitrification, denitrification and phosphorus removal (SNDPR) occurred in both SBR1 (acetic and propionic acid as mixed carbon source with the carbon molar ratio of 1.5/1) and SBR2 (acetic acid as sole carbon source), and ammonia was completely oxidized during the aerobic period without substantive nitrite accumulation. Compared with SBR2, SBR1 showed less anaerobic phosphorus release and more polyhydroxyvalerate (PHV) synthesis, but the aerobic end phosphorus and nitrate concentrations were lower. The total nitrogen and phosphorus removal efficiencies were higher in SBR1 (68% and 95%, respectively) than in SBR2 (51% and 92%, respectively) suggesting that the addition of propionic acid to SNDPR system would be helpful.