Study on Influence Factors of Waste Activated Sludge Reduction by Worms’ Predation

摘要

With temperature, dissolved oxygen concentration and pH identified as the influencing factors, responsesurface experiment was conducted to study the influence of different factors on wasted activated sludge reductionby worms’ predation. The results indicated that response surface model fitted quite well, and temperature wasconsidered as the most important influence factors of sludge reduction by worms; meanwhile, it was found thatsludge reduction rate decreased by 18% to 9.7% with the temperature decreasing. Moreover, low temperaturewould affect the worm activity; finally, compared with the difference of sludge settleability between pre and postreaction, results showed that worms would significantly improve sludge settleability.