钢铁废水回用作循环冷却水补水试验研究

Study on the reuse of iron and steel wastewater as make-up water for circulating cooling water

将钢铁废水预处理后回用作循环冷却水系统补水,是钢铁企业水资源优化配置的重要途径。运用水质稳定理论,通过实验室静态研究和中试研究,有针对性地研究了典型水质稳定剂的缓蚀与阻垢性能,筛选出了经济、高效和环境友好型水质稳定配方:HEDP、HB901和TS801(质量比45∶1∶),有效地解决了高浓缩倍数下循环水系统的腐蚀、结垢和微生物滋生问题,并于2004年11月在石家庄钢铁公司建立了示范工程,在实现环境效益和社会效益的同时,预计全厂可节约水质稳定费用150万元/a。

The reuse of iron and steel wastewater, after having been pretreated, as make-up water for industrial circulating cooling systems is a crucial step to optimal allocation of water resource. According to the theory of water quality stabilization, the corrosion and scale inhibitive performances of typical water quality stabilizers are pointedly studied. An economical, effective and environmentally friendly formula-hydroxy ethylidene diphosphonic acid（HEDP） ,HB901 and TS801 （ratio 4 ： 5 ： 1 ） has been chosen. It has been developed through a series of static feasibility studies in the laboratory and a pilot plant study. Biofilm growth, scale deposition,and bacterial growth within the circulating cooling water systems are not anticipated to cause technical difficulties when the multiple of concentration is raised from 1.5 to 2.0. In November 2004, the new formula was firstly applied to two circulating cooling water systems in Shijiazhuang Iron and Steel Company （SISC）. The approach has obtained not only environmental and society benefit, but also economical benefit. It is predicted that nearly RMB1 500 000 yuan will be saved in a year for spending on water quality stabilizers in the company.