Synthesis and characterization of polymeric inorganic coagulants for water treatment
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Synthesis and Characterization of Polymeric Inorganic Coagulants for Water Treatment Lim-Seok Kang +, Seung-Woo Han and ChuI-Woo Jung Department of Environmental Engineering, Pukyong National University, 559-l, Dae Yeon-3Dong, Nam-Gu, Busan 608-739~ Korea (Received 13 Atarch 2001 ~ accepted 23 ,hdy 2001)
Abstract-This research explored the l~asiNlity of prepm'ing and utilizing preformed polymeric solution of AI(IlI~ and Fetlll) as coagulants for water treatment The difl'crentiatkm and quantification of hydrolytic AI and Fe species in the coagulants were done by utilizing spectrophotomctric method based on the interaction orAl or Fe with lizn,on as a complexing agent. In addition, ~'TAI-NMR,F1--1R. and powdered XRD were used to characterize the nature and structure of the hydrolytic species in these coagulants, The properties of the poly'aluminum chloride (PACit and polymeric iron chloride (PIC1) showed that the mass li'actions of the maximum polymeric A1 produced at r{OH/AI) 22 and Fe at r = 1.5t()H/Ee) were 85% and 20% of'the total aluminum and iron in ,solution, respectively. Coagulation tests were conducted under '~arious coagulant dosages and pHs tbr each coagulant prepared. In case of PACI coagulants, a coagulation test on Nakdong river waters with three PACIs (r :2.0, 2.2, 2.35} showed that the cfl'ectiveness of coagulation was in the order, r 2.2>2,0>2.35. corres~)nding to the order of polymeric aluminum contents, And, Ii)r the PICI coagu[ants, the PICI o f r =: 1.5 was most effective for the remora| of turbidity and TOC from the raw water. Key words: Water Treatment, Polymeric Coagulants, Hydrolytic Species. Coagulation Tests
INTRODUCTION
for the determination of the mononuclear ion stability constant, relative to other methods. Likewise, Raman spectroscopy can be employed to characterize bonding propellim of hydrolyzed A1 ion species, but cannot directly supply quantitative e~imates ofthermodynan~ic properties for such species, Other spectroscopic tedmiques (IR, etc.) are similarly ineffective or insensitive owing to their requirements for concentrated solution, solid sample, or magnetic properties. 14owever, the ferron method is considerably more convenient than other methods for differentiating AI (or Fe) species in solution. The chemical properties of PACI are determined with Ferton method assaying each content of the polymeric, monomeric and precipitate AI in synthesized PACI. And the the existence of polymeric AI type in AI~) type is also determined to evaluate the chemical properties of PACI [Akin et al., 1972a, b]. In the case of Murphy [1975a], they were surveying the chemical properties of synthesized PIC1 by using ferron method. Recently, also, a common PAC1 has not been characterized by any methods for AI (Fe) species fraction in domestic. In this research, however, associated chemical testing methods, all of fen'on method, A1-NMR, I~T-IR,and XRD, were used to get more accurate and scientific analysis data. Comparative studies of these analysis data will be able to optimize the application of
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