Improving sludge dewatering performance by conditioning of activated calcium peroxide(CaO2)with pyrite
In this study,a sludge conditioning technology using pyrite activated calcium peroxide(CaO2)was proposed to improve sludge dewaterability,and the effect of pyrite and CaO2 alone/combined conditioning sludge on sludge dewatering performance was investigated.The effects of different conditioning methods on the properties of sludge were analyzed by combining the changes of extracellular polymeric substance(EPS)properties(EPS content and Three-Dimention fluorescence spectrum of each layer)and the structural changes of sludge floc(particle size of sludge floc).The results showed that the sludge samples had a lowest SCST value(0.55)when the dosage of pyrite and CaO2 was 1 g·L-1 and 30 mg·g-1TS,respectively.It was found that cracking EPS structure can improve the sludge dewatering performance,however,excessive decomposing EPS structure will lead to the release of a large number of organic compounds into the sludge and the particle size of flocs will decrease significantly,resulting in the poor sludge dewatering performance.
NETL
NSTL
万方数据
