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Electrical neutralization ability of polyaluminum chloride (PACl) coagulants with different OH–/Al3+ ratios by fluorescence quenching effect

Chi Fung Hwa, Cheng Wen Po, Yu Ruey Fang, Chen Zhao Feng

Environment Protection Engineering

2020

Vol. 46, nr 2

25--39

The electrical neutralization ability of polyaluminum chlorides (PACls) with respect to humic acid was investigated by the fluorescence quenching method. The Stern–Volmer constant (Kq) at various pH and coagulation doses was determined for polyaluminum chlorides (PACl-B) of various basicities (B, B = [OH–]/[Al]). The experimental results show that under acidic conditions, the order of Kqvalues of PACl-B is PACl-2.5 > PACl-2.3 > PACl-1.5 > AlCl3. In solutions of pH = 7, the order of Kqvalues is PACl-1.5 > PACl-2.3 > PACl-2.5 > AlCl3. When pH > 7, aluminum ions are rapidly hydrolyzed, thus PACls of various basicities generally do not show capacity for electrical neutralization with humic acid. At pH = 6, all PACls-B obtain the maximum Kq values, indicating that humic acid and PACl-Bcoagulation process is less affected by H+ or OH– ions, and produces the best electrical neutralization ability. Compared to the past method of using surface potential as a means of determining the ability of neutralization of coagulation, the results of this study show that the Kq value of the quenching effect can reduce the experiment complexity.

Badanie właściowości koalgulacyjnych polichlorku glinu

Dzięgielewska M., Kosshuth A., Fligier M.

Zeszyty Naukowe. Chemia / Politechnika Śląska

1998

z. 137

37-47

Badano właściwości koagulacyjne polichlorku glinu (PCG) o formule Al2(OH)3,3Cl2,1(SO4)0,3, otrzymywanego według opracowanej przez autorów technologii i prównano je z właściwościami siarczanu(VI) glinu i polichlorku glinu PAC firmy Taki Chemical Co. Ltd. Stwierdzono, że oba preparaty polichlorku glinu (PCG i PAC) wykazują bardziej efektywny przebieg koagulacji i działają w szerszym zakresie pH aniżeli sierczan(VI) glinu.

The coagulation properties of aluminium polichloride Al2(OH)3,3Cl2,1(SO4)0,3, (PCG) obtained according to the technology worked out by the authors have been compared with properties of aluminium sulphate(VI) and aluminium polychloride (PAC) produced by Taki Chemicals Co.Ltd. The investigations revealed that the coagulation process is more effective in the wider range of pH values when the aluminium polychloride was used in comparison with aluminium sulphate(VI). The effects are similar for both preparations as well PCG as PAC.