石灰处理去除水中有机物

本文介绍了采用石灰处理法去除原水中有机物的实验室和工业性试验。试验结果表明,有机物去除率在出水pH达11以上时急剧升高,pH至12左右时趋于稳定(以降低碳酸盐硬度为目的的常规石灰处理中pH控制范围则为9.5～10.3);另一方面,当出水pH>11.5时,水中残余硬度开始迅速上升。因此最佳的pH控制范围宜为11.0～11.5,此时的有机物去除率为35％～40％,较常规石灰处理时的有机物去除率(约25％)及PFS混凝剂处理时的去除率(约12％)均有较显著的提高。

Lime Treatment for Organics Removal in Raw Water

The laboratory and industrial test of organics removal in raw water by lime process is described inthis paper. The rate of organics removal, shown by the test results, increases rapidly when the pH of the ef-fluent reaches 11 and up and keeps steadily when the pH reaches 12 (the pH range for conventional lime treat-ment for the purpose of carbonate hardness removal is 9. 5 to 10. 3), while on the other hand, the residuecarbonate hardness in effluent will sharply increase when the pH exceeds 11. 5. The optimal pH range, there-fore, is selected at 11. 0 to 11. 5 with a removal rate of 35 to 40%, which is significantly higher than those ofthe conventional lime process (25%) and PFS coagulant treatment (12%).