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| 1 | Deposition behavior of residual aluminum in drinking water distribution system:Effect of aluminum speciation显示文摘Finished drinking water usually contains some residual aluminum.The deposition of residual aluminum in distribution systems and potential release back to the drinking water could significantly influence the water quality at consumer taps.A preliminary analysis of aluminum content in cast iron pipe corrosion scales and loose deposits demonstrated that aluminum deposition on distribution pipe surfaces could be excessive for water treated by aluminum coagulants including polyaluminum chloride(PACl).In this work,the deposition features of different aluminum species in PACl were investigated by simulated coil-pipe test,batch reactor test and quartz crystal microbalance with dissipation monitoring.The deposition amount of non-polymeric aluminum species was the least,and its deposition layer was soft and hydrated,which indicated the possible formation of amorphous Al(OH)_3.Al_(13) had the highest deposition tendency,and the deposition layer was rigid and much less hydrated,which indicated that the deposited aluminum might possess regular structure and self-aggregation of Al_(13)could be the main deposition mechanism.While for Al_(30),its deposition was relatively slower and deposited aluminum amount was relatively less compared with Al_(13).However,the total deposited mass of Al_(30) was much higher than that of Al_(13),which was attributed to the deposition of particulate aluminum matters with much higher hydration state.Compared with stationary condition,stirring could significantly enhance the deposition process,while the effect of pH on deposition was relatively weak in the near neutral range of 6.7 to 8.7. | Yue Zhang Baoyou Shi Yuanyuan Zhao Mingquan Yan Darren A.Lytle Dongsheng Wang | 2016 | Journal of Environmental Sciences2016，28，4： | 5 |
| 2 | 单体铝与纳米铝团簇絮凝剂的残余毒性效应显示文摘铝盐絮凝剂是国内外最常用的水处理和水环境修复药剂,一直以来对其残余毒性研究主要是从传统单体铝角度进行探索。残余铝的生物毒性与其赋存形态具有相关性。目前针对铝总量毒性的研究较多,但从形态角度对不同形态羟基铝尤其是纳米Al_(13)团簇毒性效应的研究相对缺乏,且已有研究结果存在争议。单体铝在一定条件下可转化为纳米铝团簇,进一步增大残余铝的毒性效应复杂性。为此,本研究在调查铝残留途径和来源的基础上,深入探讨了不同形态羟基铝(无机单体离子态Alm、纳米多核团簇态Al_(13))毒性效应的研究进展,分析残余铝的毒性效应特征和影响因素,为优化铝盐絮凝剂投加、残余铝控制标准修订和确保水生态环境安全提供参考。 | 吴悦菡 田晨浩 冯成洪 | 2021 | 环境化学2021，40，5： | 3 |
| 3 | Effect of in-situ formed Al hydrates through long-term aging on enhanced particle destabilization by PACl coagulation显示文摘Aging of polyaluminum chloride(PACl) coagulants could significantly influence hydrolyzed Al speciation ruling coagulation performance.The goal of this study was to investigate Al species transformation through long-term aging and its impact on coagulation performance.Two kinds of commercial coagulants(PACl-1 and PACl-2) were stored for in-situ aging tests in six months to evaluate Al species variation with time and the performance of coagulation with natural turbid waters.The results showed that CaSO4 precipitation easily occur in a commercial PACl coagulant with time as it contains SO4^2- and Ca^2+.It also activates the precipitation of gibbsite Al(OH)3 in PACl with aging.Through 180 days aging,both monomeric Al(Ala) and polymeric Al(Alb) substantially transform into colloidal Al(Alc) and precipitated for both PACl coagulants.At low turbidity(10 NTU),PACl-1 has a superior turbidity reduction rate than PACl-2,while PACl-2 performs a little better turbidity re duction at high turbidity(1000 NTU) regardless of aging time.With aging time,an obvious decrease in turbidity reduction for PACl-1 coagulation is observed at low turbidity of 10 NTU,while the improvement in turbidity reduction for PACl-2 coagulation by enhanced sweep flocculation can be achieved as Alb mostly transform into Alc after 150 days aging.It is concluded that dominant in-situ formed Alc after a long time hydrolysis can improve PACl coagulation efficiency in turbidity reduction by enhanced sweep flocculation,especially for low turbidity water,but the increase in preformed Alc in PACl would worsen particle destabilization after aging. | Jr Lin Lin Aldeno Rachmad Ika Chun Chen Tseng | 2020 | Journal of Environmental Sciences2020，32，6： | 0 |
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