摘要：

以含锌硫酸废水、铁屑、硅酸钠为原料制备聚硅酸铁锌絮凝剂。对制备条件的优化结果表明，当SiO₂质量分数为0.020～0.025，n（Fe+Zn）/n（Si）为1.5～2.0，硅酸活化的pH为 1.56～2.12，活化时间为12～16 h时，制备的聚硅酸铁锌絮凝剂的絮凝性能优良。用制备的聚硅酸铁锌絮凝剂二段处理含肼废水，结果表明，经该絮凝剂处理后，废水COD从7 065 mg/L降低到1 235 mg/L，COD去除率达到了82.5%，pH从13～14降低到9～10，降低了含肼废水后续生物处理的负荷和冲击。

关键词: 含锌硫酸废水, 聚硅酸铁锌絮凝剂, 含肼废水

Abstract:

Poly-silicate-ferric-zinc flocculant has been made from sulfuric acid wastewater containing Zn²⁺,iron scraps and sodium silicate. The results show that when the mass refraction of SiO₂ is 0.020-0.025,n(Fe+Zn)/n(Si) is 1.5-2.0,silicic acid activated pH is1.56-2.12 and activation time is 12-16 h. The flocculation capacity of the prepared poly-silicate-ferric-zinc flocculant is excellent. The prepared poly-silicate-ferric-zinc flocculant has been used for two-stage treating the hydrazine-containing wastewater. The results show that after being treated by this flocculant,the wastewater COD can be decreased from 7 065 mg/L to 1 235 mg/L,COD removing rate reaches 82%,and pH is decreased from 13-14 to 9-10. The load and attack of subsequent biochemical treatment of wastewater containing hydrazine has been decreased.

Key words: sulfuric acid wastewater containing Zn²⁺, poly-silicate-ferric-zinc flocculant, hydrazine-containing wastewater

中图分类号: 

• TQ314.253

• X703