乙酸钠对厌氧段释磷过程的影响研究

Impact of Sodium Acetate on Anaerobic Phosphorus Release

以乙酸钠为唯一碳源,分别在污泥浓度为2 000和3 000 mg/L时,研究了乙酸钠投配量对厌氧/好氧SBR生物除磷系统厌氧段释磷过程的影响。结果表明:当乙酸钠负荷约为0.15gCOD/gVSS时,厌氧段聚磷菌释磷量相对最大,当乙酸钠负荷小于或大于此值时释磷量都相对较小;并且当乙酸钠负荷<0.24 gCOD/gVSS时,释磷时间随着碳源负荷的增加而越来越长,超过这个值之后,系统中周期内没有明显的厌氧释磷和好氧吸磷现象,其原因归结为乙酸钠浓度增大引起pH值过高,造成厌氧段聚磷菌不释磷,从而导致后续好氧吸磷过程遭到破坏。

Taking sodium acetate as sole carbon source, the effects of sodium acetate dose on the anaerobic phosphorus release in anaerobic/aerobic SBR system were studied at sludge concentrations of 2 000 mg/L and 3 000 mg/L. The results show that when the sodium acetate loading rate is about 0.15 gCOD/gVSS, the phosphorus release relatively reaches the largest, and it is relatively smaller if the sodium acetate loading rate is less or greater than the value. Furthermore, the time of phosphorus release is prolonged with the increase of carbon concentration when the sodium acetate loading rate is less than 0.24 gCOD/gVSS, however, there is no significant anaerobic phosphorus release and aerobic phosphorus uptake in the system when the value is larger than it, the reason comes down to the higher pH due to the increase of sodium acetate concentration, which causes the phosphate accumulating organisms not to release phosphorus in anaerobic section and the subsequent phosphorus uptake process to be damaged.