过氧化钙预氧化对污泥脱水特性的影响

The effect of pre oxidation of calcium peroxide on the characteristics of sludge dewatering

采用过氧化钙调理污泥,改变过氧化钙投加剂量、反应时间,考察污泥上清液COD、多糖及蛋白质和泥饼含水率,研究过氧化钙预氧化对污泥絮体结构以及脱水性能的影响.结果表明,随着反应时间和过氧化钙剂量的增加,处理后污泥上清液COD增加,多糖含量先增加后减少,蛋白质含量增加,泥饼含水率有明显降低.当过氧化钙的投加量为200mg/gTS时,泥饼的含水率最低为68.3%.当过氧化钙的投加量再增大时,污泥絮体分解越破碎,不利于污泥脱水.用等量过氧化氢调理污泥进行对比,发现过氧化钙可作为一种更稳定的过氧化氢源,对污泥脱水效果更好.

The effect of the calcium peroxide on the dewaterability of the sludge under the conditions of changing the calcium peroxide dosage and reaction time by investigating COD of sludge filtrate,polysaccharide and protein and water content was studied.The results demonstrate that with the the increase of reaction time and calcium peroxide dosage,the filtrate COD increased.And the content of polysaccharide increased and then decreased,and the protein content increased.And the water content was significantly reduced.The water content of sludge cake was 68.3% when the amount of calcium peroxide was 200 mg/gTS.When the added amount of calcium peroxide was increased,the sludge flocs were decomposed too much,which is not conducive to the sludge dewatering.With the same amount of hydrogen peroxide conditioning sludge for comparison,calcium peroxide has been found to be a more stable source of hydrogen peroxide and provide better effect on the sludge dewatering.