Direct monitoring of polymer residual as an environmental safety strategy in alum sludge conditioning/flocculation
This paper describes the successful application of size exclusion chromatography(SEC) mechanism using high performance liquid chromatography(HPLC)to directly monitor polymer (Magnafloc LT25)residual,which was derived from an alum sludge conditioning process of a drinking water treatment plant in Ireland.The timeliness and importance of the study stem from the increasing concerns on the proper use of polymers during such sludge conditioning,particularly appropriate dosage,and the potential negative impact of the residual polymer on the environment.According to established methodology,it has been clearly demonstrated that the excess addition of polymer in terms of over-dosing,leads to increased concentration of polymer residual in the supematant of the conditioned sludge.In the water treatment plant studied,polymer concentration of 0.03 mg/L has been monitored in the sedimentation tank in the main water treatment process of the plant,and this is believed to be caused by recycling the supernatant water to the main treatment system after the mechanical dewatering of the sludge.The investigation provides a first-hand evidence as regards the need for the proper application of the polymer,particularly in terms of the dosage.Furthermore,direct monitoring of the polymer residual might be useful in developing a more environmentally friendly water treatment process by ensuring proper polymer control and an efficient supematant treatment strategy.A long-term and high frequency sampling using such approach,with a modified polymer residual monitoring methodology is necessary and desirable.
Alum sludge conditioning HPLC polymer residual water treatment
Y.Q.ZHAO X.H.ZHAO C.KEOGH W.C.LI
Centre for Water Resources Research,School of Architecture,Landscape and Civil Engineering.Newstead School of Biology and Environmental Science,University College Dublin,Belfield,Dublin 4,Ireland
国际会议
西安
英文
689-694
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）