Improvement of digestion and production of high phosphorus containingsludge using sulfate reducing microorganisms

在实验室规模的反应器中研究了投加CaSO4对剩余污泥的降解和磷的回收。当向剩余污泥中加入CaSO4并在25 ℃厌氧条件下培养时，产生乙酸盐，并根据硫酸盐还原作用在污泥中积累磷。然而，甲烷产量并没有增加。还考察了CaSO4对污泥消化的影响。通过添加CaSO4提高了原污泥的甲烷产率。消化污泥中硫酸盐还原生成乙酸的活性较高。

Degradation of excess sludge and recovery of phosphorus by the addition of CaSO4were investigated in a laboratory scale reactor. When CaSO4 was added to the excess sludge and cultivated in the anaerobic conditions at 25 oC, acetate was produced and phosphorus was accumulated in the sludge according to sulfate reductio . However, the amount of methane production did not increase. The effects of the addition of CaSO4 on sludge digestion were also examined. Methane yield of raw sludge was increased by the addition of CaSO4. The activity of sulfate reduction which produce acetate was high in the digested sludge.