The Preparation Of Compound Ferrous Flocculant By Hydrochloride Acid Pickling Waste Water And Research On Performance And Application Of The Flocculant

The pollution of acid pickling waste water is one of serious problems of environmental protection and resource recycling, the aim of the paper is to produce a kind of effective and economical compound ferrous flocculant to pave a new way for the development and utilization of acid pickling waste water.In this paper, the preparation of compound ferrous flocculant was studied, the property of turbidity and color removal by dealing with humus acid, kaolin and dyeing simulate waste water were tested, the effect of Si/Fe, dosage, pH, temperature on property of compound ferrous were also examined, and it was Compared with original acid waste water FeSO4 and PFS. The electrokinetic and conductance property were investigated, the Infrared Spectrum of compound ferrous were also analysed, the configuration of compound ferrous were examined by transmission electron microscope. The results of research showed that compound ferrous flocculant has simple preparation and not any second pollution matter is produced to the environment, it has big and stout floes formation and fast speed sedimentation while dealing with waste water, it is positively charged according to the electrophoresis, it belongs to cationic flocculant, can gives better coagulation results in turbidity removal, color removal, the maximum removal rate of turbidity and color are 95.4% and more than 81.7%, respectively. There are interactions between polysilicic acid and hydrolyzed ferrous species, the compound ferrous with appropriate Si/Fe not only but also can lower the water treatment cost. The compound ferrous removes colloid particles in water by charge oxidation-reduction, neutralization and furl mechanism.The application of compound ferrous are widely, it has been successfully applied for dealing with electrophoresis waste water and foam nickel waste water, all are good enough to the requirement of the discharge standard, the results of experimental study showed that when dealing with electroplating waste water contained Ni2+, Cu2+ and Cr6+, concentration of effluent are both below 0.1mg/L for Ni2+, and Cu2+, Cr6+ is not detected; It can also dispose several chemical plating liquid waste; For dying waste water, the removal rate of COD and color are more than 84% and 98%, respectively. So this kind of coagulant should be further developed and spread with wide range of pH and better effect but lower cost.According to the results of experiments and considering actual production, thepaper introduced application method on compound ferrous in industry and analysis of economic and benefit were also finished.