摘要
对比研究了5℃水温条件下,3种钝化剂(锁磷剂、硫酸铝和聚铝)抑制滇池重污染底泥磷释放效果的影响。滇池冬季水温在5℃上下浮动,因此5℃部分代表滇池冬季水温条件。结果表明,随着时间的推移,上覆水磷浓度增加,底泥磷释放速度减缓。3种钝化剂中,锁磷剂在抑制沉积物磷释放,及捕捉上覆水中含磷颗粒方面,较硫酸铝、聚铝表现出更优的效果:锁磷剂对TP/DTP释放抑制率比硫酸铝高16.74%,16.93%,比聚铝高9.17%,6.43%。主要原因是:锁磷剂中含有镧化物,可与磷酸根生成溶解度极低的磷酸镧沉淀;且其十分稳定,可使磷长期被钝化于沉淀底泥中,不产生二次释放。差异性分析表明,硫酸铝、聚铝和锁磷剂对TP及DTP释放抑制效果没有差异(P>0.05)。经济比较分析:在同等工程量的前提下,达到相同的沉积物磷释放抑制效果锁磷剂经济效益最佳,锁磷剂所需费用为硫酸铝的71.74%,为聚铝的44.44%。
Three kinds of inactivation agents including Phoslock, Al2（SO4）3·18H2O and PAC- polymeric aluminum Chloride were used to study their inhibitory effect on P release from sediment of Lake Dianchi. The P concentration in overlying water increased with time,which made the P release slowly. When compared to Al2（SO4）3and PAC,Phoslock had a higher ability to inhibit the TP/DTP release and to capture particlulate phosphorus in overlying water. Bycomparison with Al2（SO4）3, the inhibition rate of TP and DTP by Phoslock increased by 16.74% and 16.93%,respectively, while higher than PAC with 9. 17 %,6.43%. The main reason is that Phoslock contains lanthanum chloride,which can generate phosphoric acid lanthanum by precipitating with phosphoric acid.The phosphoric acid lanthanum is very stable and can strengthen the adsorbtion of phosphorus sediment for long time,which thus inhabit its secondary release. Variance analysis showed that there are no difference in the inhibiting effect of Al2（SO4）3,PAC and Phoslock agent of TP/DTP release（P〉0.05）.Within the scope of economic comparative analysis;on the premise of equal quantity,Phoslock has the best economic benefits to achieve the same sediment phosphorus inhibitory effect. Phoslock cost 71.74 % of the aluminum sulfate,44.44% of the polyaluminum.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第3期54-60,共7页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2012ZX07105-002
2013ZX07101-014)
中央级公益性科研院所基本科研业务专项(2012-YSKY-14)
关键词
低温
钝化剂
锁磷剂
沉积物
磷释放
low temperature
inactivation agent
phoslock
sediment
phosphorus release
