应用ORP预测和控制地下水除铁滤池出水含铁量

Using ORP for predicting and controlling the iron content of the effluent from the groundwater filter bed for iron removal.

试验研究了应用氧化还原电位(ORP)预测和控制除铁滤池出水含铁量的可行性,探讨了水力负荷(HLR)、溶解氧(DO)和pH值对ORP滤池除铁效果的影响以及曝气过滤除铁的机理.结果表明,在pH值为6.69,DO为6.8mg/L时,滤池除铁机理主要为接触催化氧化作用;HLR、DO和pH值对滤池除铁有较大的影响;滤池出水含铁量(Y)与ORP(X)之间的关系可用回归方程y=0.0004exp[3816/(X+200)](R2=0.9664)表示;当ORP在400～510mV时,滤池出水含铁量小于0.3mg/L.

Through experiment, the feasibility of using oxidation-reduction potential (ORP) to predict and control the iron content of the effluent from the iron removal filter bed was studied. The influences of hydraulic loading rate (HLR), dissolved oxygen (DO), and pH value on ORP and iron removal effect of the filter bed, as well as iron removal mechanism of the aeration filter were explored. As pH value was 6.69 and DO was 6.8mg/L, the iron removal mechanism of the filter bed was mainly contact-catalytic oxidation action. HLR, DO and pH value had greater influences on iron removal of the filter bed. The relation between iron content of the filter bed effluent (Y) and ORP (X) might be expressed by the regressive equation. At ORP of 400~510mV, the iron content of the filter bed effluent was below <0.3mg/L.