title: A novel chemical oxo-precipitation (COP) process for efficient remediation of boron wastewater at room temperature.
abstract: Chemical oxo-precipitation (COP), which combines treatment with an oxidant and precipitation using metal salts, was developed for treating boron-containing water under milder conditions (room temperature, pH 10) than those of conventional coagulation processes. The concentration of boron compounds was 1000mg-BL(-1). They included boric acid (H3BO3) and perborate (NaBO3). Precipitation using calcium chloride eliminated 80% of the boron from the perborate solution, but was unable to treat boric acid. COP uses hydrogen peroxide (H2O2) to pretreat boric acid, substantially increasing the removal of boron from boric acid solution by chemical precipitation from less than 5% to 80%. Furthermore, of alkaline earth metals, barium ions are the most efficient precipitant, and can increase the 80% boron removal to 98.5% at [H2O2]/[B] and [Ba]/[B] molar ratios of 2 and 1, respectively. The residual boron in the end water of COP contained 15ppm-B: this value cannot be achieved using conventional coagulation processes.
authors.affiliation: Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA.
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Shih
authors.affiliation: Department of Chemical Engineering, National Cheng-Kung University, Tainan 701, Taiwan.
authors.forename: Chia-Hsun
authors.initials: CH
authors.lastname: Liu
authors.affiliation: Department of Chemical Engineering, National Cheng-Kung University, Tainan 701, Taiwan.
authors.forename: Wei-Cheng
authors.initials: WC
authors.lastname: Lan
authors.affiliation: Department of Chemical Engineering, National Cheng-Kung University, Tainan 701, Taiwan; Sustainable Environment Research Center, National Cheng-Kung University, Tainan 701, Taiwan. Electronic address: yhhuang@mail.ncku.edu.tw.
authors.forename: Yao-Hui
authors.initials: YH
authors.lastname: Huang
mesh_terms: D001888:Boric Acids / Q000737:chemistry / Q000302:isolation & purification; D001895:Boron / Q000737:chemistry* / Q000302:isolation & purification; D011232:Chemical Precipitation; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D012492:Salts / Q000737:chemistry; D013696:Temperature; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D001888:Boric Acids; D001895:Boron; D006861:Hydrogen Peroxide; D008670:Metals; D012492:Salts; D062065:Wastewater; D014874:Water Pollutants, Chemical; C032688:boric acid
keywords: Alkaline earth metal; Barium; Boric acid; Hydrogen peroxide; Perborate