Selection of Flocculant in Highly Turbidity Seawater with Micro-sand Ballasted Floc Technology

摘要

In order to determine the optimum flocculant in pre-treatment of highly turbidity seawater with Actiflo? micro-sand ballasted floc high efficiency sedimentation process. Performance evaluation for inorganic and organic flocculants' coagulation efficiency in seawater system was made by using micro-sand ballasted floc technology. When using PAM as coagulant aid, compared with the inorganic flocculants, the dosage of inorganic flocculants in seawater purification process was halving, meanwhile, the coagulation effect of ferric salt was better than that of aluminous salt. While, the dosage of inorganic flocculants combined with osseocolla was lower than that of PAM as coagulant aid, moreover, effluent turbidity was even lower in the same dosage of organic flocculants. When organic flocculants combined with inorganic flocculants coagulated seawater, there were relationship with the optimum dosage and the kinds of flocculants. Colloid re-stabilized with the increase of dosage when organic polymer flocculants were used to treat seawater. When inorganic flocculants arrived the optimum dosage, the coagulant performance of osseocolla was superior to PAM conspicuously.