氯化铁用于反硝化同步化学生物絮凝工艺研究

Iron Chloride for Simultaneous Denitrification and Chemical-Biological Flocculation Process

通过小试考察了氯化铁用于反硝化同步化学生物絮凝工艺的可行性.结果表明,在氯化铁投加量(以铁计)为20mg.L-1的条件下,反硝化污泥通过14 d的驯化,可以适应氯化铁的投加,反硝化速率、COD和NO3--N去除效果与空白反应器无明显差异,同时具有较好的TP去除效果,去除率高于80%.氯化铁的投加虽然提高了污泥浓度,但由于污泥中无机物比例增加、密度增大,同时污泥粒径变小,使污泥的沉淀性能与空白反应器中的污泥无明显差异,且SV30值仅为22%左右,小于空白反应器中污泥的27%.投加氯化铁后的污泥比阻平均为1.5×1012m.kg-1,远低于空白反应器中污泥的40.2×1012m.kg-1,浓缩后污泥的体积减少和比阻的降低有利于污泥的后续处理.

The efficiency of iron chloride on simultaneous denitrification and chemical-biological flocculation process was investigated through a lab-scale study.The results showed that: there were not significant differences in the denitrification rate,COD and NO-3-N removal efficiency between the control reactor and the denitrification reactor with the dosage of 20mg·L-1 Fe after 14 days' domestication.Meanwhile the TP removal efficiency was increased to over 80%.Though sludge concentration was increased by adding FeCl3,the settling performance wasn't change because the sludge density was increased and the particle size was reduced.The sludge settling volume(SV30) and specific resistance of filtration(SRF) after adding FeCl3 were only 22% and 1.5×1012 m·kg-1,which were lower than the values in the control reactor and benefit for sludge treatment.