石灰石固定滤床在钢厂酸洗废水处理中的应用

Application of limestone in fixed filter bed to the treatment of acid pickling wastewater in steel works

根据天津某钢厂废水水质特点，将石灰石固定滤床应用于该实际工程中，将废水pH由1-2调节至4-5后，在曝气氧化的条件下，再用碱石灰将pH调至8．5—9，以去除废水中的Fe2＋、H＋PO43-、Zn2＋。采用该方法不仅因为石灰石价格低廉，降低了废水单位处理费用，而且处理效果稳定，便于后续碱石灰投加的自动化控制。

According to the features of the wastewater in a steel works in Tianjin, the limestone in fixed filter bed has been applied to the treatment of acid pickling wastewater. After the pH of the wastewater is adjusted from 1-2 to 4-5, the Fe2＋, H＋, PO43- and Zn2＋ in the wastewater can be removed, when the pH is adjusted to 8.5-9 with soda lime under aeration oxidation conditions. Using the limestone in fixed filter bed for treating the wastewater can not only re- duce the treatment cost, since the limestone is cheap, but also make the treatment steady, and is convenient for con- trolling the subsequent soda lime adding automatically.