Abstract
Experiments were carried out for pretreatment of feed water for RO by adsorption of colloidal matter on Mg(OH) 2 (or hydrated MgO) formed as well as comparative experiments for brackish water pretreatment by: (1) coagulation and flocculation; (2) lime softening, coagulation and flocculation; (3) lime softening and adsorption on the Mg(OH) 2formed; (4) lime-alkaline softening and adsorption on the Mg(OH) 2 formed; (5) dolomitic lime softening and adsorption with hydrated MgO formed. It was established that colloidal matter in brackish lake water is sharply reduced only by adsorption on the Mg(OH) 2 (or hydrated MgO) formed in sufficient quantity and the pretreated feed water meets the requirements of the spiral wound and hollow fibre membranes. Optimum results for pretreatment of the tested water by adsorption on the Mg(OH) 2 formed and maximum rate of precipitation of the CaCO 3 and Mg(OH) 2 are achieved when the ratio CaCO 3:Mg(OH) 2 is 3:2. It was found that technologically and economically the most advantageous method for brackish lake water pretreatment is dolomitic lime softening, where dolomite dosage of 450 mg/l and a reaction time of more than 1 h is needed in order to reach heterogeneous equilibrium.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
