摘要
东北松花江地区冬季有将近6个月的冰封期,低温季节水源水处理难度大。为了保证东北地区冬季饮用水供应,研究几种混凝剂在处理冬季松花江低温水时的混凝效果。实验结果表明,NPAC1和NPAC2水解产物中具有较高的Alb和Alc成分,拥有较高的电中和、吸附和网捕卷扫性能,高效聚铝铁(PAF)水解产物Fe(OH)3具有比表面积大、吸附架桥作用较强的优点。这3种混凝剂无论是在控制出水浊度还是在对水体有机物去除能力方面均优于目前水厂所使用的PAC和聚合氯化铝铁(水厂PAF);NPAC2的投加量达到50 mg/L时,出水浊度达到最优;当混凝剂投加量达到50 mg/L时,NPAC1的浊度去除率逐渐超过NPAC2,剩余浊度低于3.0 NTU;NPAC1、NPAC2和PAF 3种混凝剂对有机物的去除能力大致相当,当混凝剂投加量为50 mg/L时,这3种混凝剂处理后的水的UV254的值均低于0.06,而水厂使用的2种混凝剂处理后的水的UV254仍高于0.1;结合其对浊度去除的情况,可以判断55 mg/L的投药量为NPAC1的最优投药点,PAF的最佳投药量为65 mg/L;投加适量的粉末活性碳可以有效地提高氨氮的去除率,当粉末活性炭的投加量为30 mg/L时,氨氮的去除率基本达到最大(51.27%)。表面负荷对混凝效果具有重要的影响,合理降低沉淀池的表面负荷对于提高出水水质具有重要作用。
Treatment of low temperature source water in winter was difficult in Northeast China. In order to solve the problem,several new coagulants were applied to treat the low temperature source water derived from Songhua River. The results indicated that the concentrations of Alband Alcin NPAC1 and NPAC2 were larger than that in PAC,and the new coagulants performed better either in controlling turbidity or removing organic matter than PAC and PAF currently used in water treatment plants. The optimal dosage in controlling turbidity was 50 mg / L for NPAC2,and the residual turbidity for NPAC1 was less than 3. 0 NTU when the coagulant dosage reached 50 mg / L. Meanwhile,removal efficiency of organic matters was almost the same for three new coagulants.When the coagulant dosage was 50 mg / L,the residual UV254 of water treated by three new coagulants was almost smaller than 0. 06. Combined with turbidity removal efficiency,the optimal dosages for NPAC1 and PAF were 55 mg / L and 65 mg / L,respectively. Besides,the addition of powder activated carbon could increase the removal efficiency of ammoniacal nitrogen. At the dosage of the powder activated carbon 30 mg / L,the removal efficiency of ammoniacal nitrogen reached to 51. 27%. Surface loading and retention period had significant influences on the coagulation performances.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第4期1527-1533,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51378014
51338008
51338010
21107125)
关键词
低温水源水
混凝
氨氮
表面负荷
絮体沉降
low temperature source water
coagulation
NH3-N
surface loading
settlement of flocs
