黄铁矿活化过氧化钙(CaO_(2))调理提升污泥脱水性能

Improving sludge dewatering performance by conditioning of activated calcium peroxide(CaO_(2))with pyrite

本研究提出了一种利用黄铁矿活化过氧化钙(CaO_(2))的污泥调理技术,考察了黄铁矿和CaO_(2)单独/复合调理污泥对污泥脱水性能的影响.本研究中结合胞外聚合物(EPS)性质变化(各层EPS含量、三维荧光光谱)以及污泥絮体结构变化(污泥絮体粒径)分析不同调理方法对污泥性质的影响.结果表明,在黄铁矿和CaO_(2)投加量分别为1 g·L^(−1)和30 mg·g^(−1)TS调理条件下,污泥样品有最低的SCST值(0.55).在研究中发现,通过破解EPS结构虽然能提升污泥脱水性能,但过度的EPS结构破解,会导致大量污泥内部有机物释放,絮体粒径大幅下降,反而降低污泥的脱水性能.

In this study,a sludge conditioning technology using pyrite activated calcium peroxide(CaO_(2))was proposed to improve sludge dewaterability,and the effect of pyrite and CaO_(2)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 CaO_(2)was 1 g·L^(−1)and 30 mg·g^(−1)TS,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.