单一好氧环境下的强化生物除磷研究

将乙酸钠为单一碳源、厌氧/好氧交替、具有较好除磷效果的传统生物除磷SBR系统,改为单一的好氧SBR运行方式,发现改变后的SBR系统仍可取得较好的除磷效果,除磷率最高达73.9%,最低约40%,平均维持在50%左右.这种现象可以维持长达80个周期.污泥含磷率由最初的1.43%增加到6.56%.对污泥微生物胞内PHB和糖原进行测定,结果表明此系统中微生物PHB和糖原在VSS中含量分别约为27 mg/g和26 mg/g,二者含量在好氧过程中都基本保持不变.通过对反应过程中碳源消耗与磷吸收关系的分析,认为该单一好氧条件下的生物除磷机制是由于长期以乙酸钠为唯一碳源下,试验系统中活性污泥被驯化,在胞内聚磷颗粒含量容纳能力范围内还可以在好氧环境下以乙酸钠氧化产生的ATP为能量进行磷吸收所致.

Enhanced Biological Phosphorus Removal in Single Aerobic Process

When SBR with sodium acetate as the sole carbon source and operated under alternative anaerobic and aerobic condition had achieved a good performance in phosphate removal, it was shifted to completely aerobic treatment system, and found that a good phosphorus removal with removal efficiency of the highest of 73.9%, the lowest of 40% and an average of about 50% was still achieved. The phosphate removal could last 80 cycles before regeneration. Phosphate content of sludge in the SBR increased from 1.43% to 6.56%. PHB and glycogen in the sludge were 27 mg/g and 26 mg/g, respectively. Both of them in the sludge during the whole cycle were of slight variation. Based on analysis of carbon consumption and phosphate absorption as well as their relationship, it is considered that this enhanced biological phosphorus removal in single aerobic process is due to that, the sludge in the system can use ATP released from aerobic oxidation of sodium acetate after acclimation to condition of sodium acetate as the sole carbon to synthesize poly-P granule in cell to a certain content.