污水厂污泥制备吸附剂及其在水处理中的应用

Preparation of Adsorbents from Sewage Sludges and Their Application in Wastewater Treatment

以城市和石化污水厂生化活性污泥及剩余污泥为原料,采用化学活化方法制备了3种吸附剂,与商品活性炭做了对比,并进行了孔结构、扫描电镜及元素分析表征。结果表明,5 mol/L ZnC l2溶液与5 mol/L H2SO4溶液复配活化剂制备的吸附剂性能较好,最佳复配比均为2∶1(体积比)。采用所制备的3种吸附剂处理城市污水及油田含油污水。结果表明,对城市污水COD及P去除率较高,均好于商品活性炭,同时污水色度也有了较大改善。石化活性污泥吸附剂对油田含油污水的处理效果相对较好。

With biochemical sludges from sewage and petrochemistry and surplus sludge as raw materials 3 kinds of adsorbents were prepared via chemical activation. Contrasted with active carbon, the adsorbents made from sludges were studied by SEM, pore characteristics and elemental analysis. The results showed that for all the sludges, the adsorbents made by the complex of ZnCl2 and H2SO4 were better, and the optimum ratio of 5 mol/L ZnCl2 and 5 mol/L H2SO4 solution was 2： 1. By application of those adsorbents to the treatment of wastewater and oil-bearing sewage from oilfield, the removal rates of COD and P were better than that for active carbon, and the chromaticity color of the wastewater improved. The adsorbent made from the sludge of petrochemistry was better for the treatment of oil-bearing sewage.