氯化铁用于反硝化同步化学生物絮凝工艺研究

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.

Iron Chloride for Simultaneous Denitrification and Chemical-Biological Flocculation Process

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 NO₃^--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.