The electrochemical production of highly effective polyaluminum chloride

Abstract

AbstractÐThis paper presents a new electrolytic method for the synthesis of PAC (polyaluminum chloride). The ECR (electrochemical reactor) used aluminum sheets as anode and AlCl 3 aqueous solution as electrolyte. This method adopted low voltage and high electric current intensity during electrolysis. Some factors of the electrochemistry and the chemistry of the aqueous solution, aecting the formation of the most eective species of PAC, were also studied. The liquid product of PAC, in which the most eective species, Alb (The polymeric Al component estimated by the ferron method), was above 70% by weight of the total aluminum with a basicity, B (OH/Al molar ratios) = 2.4, was successfully generated. The results measured by the ferron method and 27 el NMR method showed that the Alb or Al 13 content of the E-PAC (PAC prepared by electrolysis) were obviously higher than that of the general PAC and other coagulants. #

Aluminum speciation of coagulants with low concentration: Analysis by electrospray ionization mass spectrometry

“…Besides, another PACl (PACl 2 ) was prepared with the method of an electrolysis process [25,26]. Total aluminum concentrations (Al T ) were determined by an inductively coupled plasma optical emission spectrometer (ICP-OES) (Optima 2000, Perkin Elmer, U.K.).…”

Optimum conditions for Al13 polymer formation in PACl preparation by electrolysis process

“…Lu et al (1999) illustrated the principle of PACl preparation by electrolysis and demonstrated the electrolysis process could provide favorable conditions for polyaluminum formation. The purpose of this investigation is to optimize the Al 13 yield conditions in the electrolysis process for PACl preparation.…”

Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

“…PAC always contains a different speciation of hydroxy aluminum (Lu et al, 1999). The study on chemical speciation of aqueous aluminum hydroxyl clusters has achieved significant progress in recent years (Tang, 2006, Sposito, 1997, Their classification could be exemplified in Table 1.…”