起始pH值对序批式反应器中强化生物除磷系统的影响研究

Effect of Initial pH on Enhanced Biological Phosphorus Removal in Sequencing Batch Reactor (SBR)

通过3个序批式反应器(SBR)的连续运行,研究了污水不同起始pH值对强化生物除磷系统(EBPR)的影响(SBR1:pH=6.5;SBR2:pH=7.0;SBR3:pH=7.5).结果表明:随着pH值的提高,厌氧释磷量和好氧吸磷量都逐渐增加,释磷速率和吸磷速率也在增加;除磷效率分别为82.69%、93.87%和98.50%.运用荧光原位杂交技术(FISH)鉴定EBPR中的功能菌为聚磷菌(PAO)并计算出其含量,即SBR3>SBR2>SBR1,得到在一定的pH值范围内pH值越高聚磷菌的含量越高.比较不同pH值下EBPR系统中脱氢酶活性的变化规律,在pH=6.5～7.5范围内,脱氢酶的活性随着pH的增加而线性增加,表明较高的pH有利于PAO的生长和提高PAO的活性,从而提高了除磷效率.因此,通过控制污水起始pH值的方法可以达到显著提高强化生物除磷效果的目的.

Three laboratory-scale sequencing batch reactors （SBRs） were operated continuously to investigate the influence of wastewater initial pH on enhanced biological phosphorus removal （SBRI： pH=6.5; SBR2： pH=7.0; SBR3： pH=7.5）. Re- suits showed that the soluble ortho-phosphorus （SOP） release and uptake were increased, while the pH value was increased. And the SOP removal efficiency of the three reactors reached 82.69%, 93.87% and 98.50% respectively. The proportion of phosphorus accumulating bacteria （PAO） in the three SBRs was calculated by FISH technology, namely SBR3 〉 SBR2 〉 SBR1, The proportion of PAO increased with the increase of the pH value. In the range of pH 6.5-7.5, the activity of dehy- drogenase increased linearly with pH value, The results indicated that a higher pH value was beneficial to the growth and the activity of PAO, which led to an improved phosphorus removal performance, Thus, the efficiency of enhanced biological phosphorus removal can be significantly improved by controlling the initial pH of wastewater.