硅酸钙吸附处理焦化废水的试验研究

Study on coking wastewater treatment by calcium silicate

硅酸钙是粉煤灰提取高铝粉后的一种工业废弃物,为了探索硅酸钙的吸附性能,利用其对焦化生化出水中COD进行了吸附实验研究。探讨了废水pH、硅酸钙投加量及振荡时间对硅酸钙吸附性能的影响,结果表明:pH为4,每100 mL废水中硅酸钙投加量为3.15 g,振荡时间为45 min时吸附达到平衡,硅酸钙对焦化废水生化出水中COD的去除率为46.3%。由吸附等温线拟合结果可知,Freundlich与Langmuir吸附等温式的线性相关系数分别为0.984 3和0.969,Freundlich的相关系数相对较高,因此说明硅酸钙对焦化废水生化出水COD的吸附更符合Freundlich吸附等温线模型。

Calcium silicate is a kind of industrial waste,after the extraction of high aluminum powders from fly ash.In order to study the calcium silicate′s absorbing performance,its adsorption to COD from the effluent of biochemical treated coking wastewater was studied.The absorbing performance of calcium silicate was investigated by analyzing the influencing factors including the wastewater′s pH,calcium silicate dosing quantity,and oscillated time.Results showed that the removal rate of COD could reach 46.3% when adsorption was equilibrious,under pH was 4,calcium silicate dosage was 3.15 g per 100 mL waste water,and the oscillated time was 45 min.Adsorption isotherms fitting results showed that the correlation coefficients of Freundlich and Langmuir isotherms were 0.984 3 and 0.969 respectively,and the correlation coefficient of Freundlich was higher.So it proved that the calcium silicate′s adsorption to COD from the effluent of biochemical treated coking wastewater was more suitable to the Freundlich isotherm model.