粉煤灰处理生活污水

A Study on Removal of COD from Municipal Wastewater by Fly Ash

以火电厂贮灰场粉煤灰为吸咐剂，以生活污水为吸附处理对象，通过间歇吸附实验研究了粉煤灰对生活污水中化学耗氧物质（ＣＯＤ）的吸附规律，并与活性炭的吸附性能进行了比较。结果表明，粉煤灰对生活污水中的ＣＯＤ有较强的吸附作用，当灰水比为１：１０时，粉煤灰和活性炭的平衡去除率分别为８６．０％和９５．１％。粉煤灰对ＣＯＤ的吸附行为符合氟兰德利希等温方程式。低ｐＨ值、高灰水比、粗粒径粉煤灰有利于ＣＯＤ的去除。

The ability of fly ash to remove COD from municipal wastewater is studied by batch adsorption experiments and is compared with that of active carbon.The results show that COD can be removed effectively by fly ash.When the ratio of adsorbent to adsorbate is 1:10,the removal effeciency of COD of fly ash and active carbon is 86.0% and 95.1% respectively. The absorption follows Freundlich isotherm. It has been found the high ash-water ratio, acidic pH of the medium and big adsorbent particle size favor the removal of COD from wastewater.