Removal of Arsenate in drinking water sources by combined coagulation process

Authors : Kadir ÖZDEMİR

Pages : 247-274

Doi:10.18596/jotcsa.980203

View : 8 | Download : 7

Publication Date : 2022-02-28

Article Type : Research Paper

Abstract :The objective of this study is to examine arsenate insert ignore into journalissuearticles values(Asinsert ignore into journalissuearticles values(V);); removal from drinking water sources with combined coagulation processes using Single-Walled Carbon Nanotubes insert ignore into journalissuearticles values(SWCNTs); and Multiwalled Carbon Nanotubes insert ignore into journalissuearticles values(MWCNTs);. Ulutan Lake Water insert ignore into journalissuearticles values(ULW); in Zonguldak-Turkey, was used as drinking water source. Conventional coagulation experiments was conducted on using aluminum sulfate insert ignore into journalissuearticles values(Alum); and ferric chloride insert ignore into journalissuearticles values(FeCl3);. Water samples were synthesized by spiking 300 µg/L Asinsert ignore into journalissuearticles values(V); into ULW samples and also all arsenic removal tests were performed with Asinsert ignore into journalissuearticles values(V);. The maximum removal percentages of Asinsert ignore into journalissuearticles values(V); insert ignore into journalissuearticles values(97%); was observed with combined SWCNTs and FeCl3 in ULW. Similar to that of SWCNTs, the removal of Asinsert ignore into journalissuearticles values(V); insert ignore into journalissuearticles values(92%); during the coagulation processes occurred at MWCNT with the addition of FeCl3. Compared to SWCNTs, the removal percentage of Asinsert ignore into journalissuearticles values(V); was slightly lower when using only MWCNTs insert ignore into journalissuearticles values(76%);. This result demonstrated that SWCNTs were generally more powerful than MWCNTs for removing the Asinsert ignore into journalissuearticles values(V);. The presence of humic acid insert ignore into journalissuearticles values(HA); increased Asinsert ignore into journalissuearticles values(V); removal with related the solution pH. On the other hand, the changing of Asinsert ignore into journalissuearticles values(V); residual concentrations in ULW was observed as a function of pH and the removal of Asinsert ignore into journalissuearticles values(V); increases in the acidic pH levels whereas decreases alkaline pH levels. While Asinsert ignore into journalissuearticles values(V); removal efficiency was remained constant at acidic pH values, it decreased about 10% at pH 6, 7 and 8 as a result of the competitive adsorption between Asinsert ignore into journalissuearticles values(V); and HA. It was observed that the Asinsert ignore into journalissuearticles values(V); removal efficiency increased both low and high pH with monovalent electrolyte insert ignore into journalissuearticles values(NaCl); whereas di-valent ions insert ignore into journalissuearticles values(Ca+2 and Mg+2); improved Asinsert ignore into journalissuearticles values(V); removal only at pH 9 and 10 during the coagulation processes in ULW samples. The results of this study display that combined coagulation process is more effective than conventional coagulation alone for the Asinsert ignore into journalissuearticles values(V); removal.
Keywords : Arsenate removal, carbon nanotubes, water treatment, combined coagulation