Improving settleability and dewaterability of Friedel's salt for chloride removal from saline wastewater
作者： Lu-man Jiang , Zhen Zhou , Xiaodan Zhao , Yao Yuan , Dongqi Sun
DOI: 10.1016/J.DESAL.2021.115070
关键词: Settling 、 Precipitation (chemistry) 、 Dewatering 、 Chemistry 、 Chloride 、 Chemical engineering 、 Wastewater 、 Adsorption 、 Friedel's salt 、 Particle size
摘要: Abstract As an effective method for chloride removal from saline wastewater, Friedel's salt (FS) precipitation generates high concentration of precipitate requiring efficient solid-liquid separation. Effects temperature, reaction time, polyacrylamides (PAM) type and dosage on settleability dewaterability FS were investigated to explore improving strategies separation by using actual flue gas desulfurization wastewater. Raw was difficult separate gravity settling mechanical dewatering owing their small particle size solid concentration. Anionic PAM with higher hydrolysis degree molecular weight greatly improved enlarged FS. The composition crystal structure varied temperature. Increasing temperature 40 °C obtained the highest removal, because layers spacing decreased. gradually broken down Ca3Al2(OH)12 NaCl at above 60 °C. Prolonging time enhanced adsorption effects, facilitating crystals growth aging. 0.5 m3/h pilot-scale experiment confirmed that process operated stably dosing elevating Techno-economic analysis showed 37 °C optimal
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