The Study On The Effect Of The Biosorption Of Heavy Metal Zinc In The Water By Immobilized Sargassum Thunbergii

whereas the emission of acid mine drainage which resulted from the process of mining and processing of lead and zinc mine were escalating. In recent years, many studies had shown that heavy metal could be enriched through the organisms in water, and be transported in the food chain and eventually into the top of the food chain and be accumulated in the human body, which caused serious human health problem.Controlling the pollution of heavy metal in water had become the world's environmental issues of common concern. The traditional heavy metal contaminated wastewater treatment technologies including chemical and physical methods. But these methods all had some defects, easy to cause secondary pollution to the water body. In recent years, at home and abroad began to focus on the use of biological adsorption treatment of wastewater that containing heavy metal. Among these the algae have some characteristics such as accumulating heavy metal, large output and low cost. At the same time, the application of immobilization technology could effectively recycle and reuse the algae, and improved the utilization of biological sorbent. Furthermore, it reduced the cost.Using biosorption of immobilization technology of algae to deal with heavy metal in water pollution had become a trend.In this study, using algae joint immobilization technology to adsorb heavy Zinc in water.The Sargassum thunbergii and activated carbon were treated as the embedding objects, and preparing the immobilized Sargassum thunbergii particles.Through the analysis of the immobilized material ratio of zinc adsorption rate impact.the optimal condition of immobilization was determined; also, the effect of immobilized beads adsorption properties under different environmental conditions was investigated;finally, put the immobilized beads into the fluidized reactor to stimulate the treatment of wastewater and study the effect of adsorption and desorption.The main research results were as follow:(1) Orthogonal experiments showed that experimental factors polyvinyl alcohol have a significant impact on the expansion and compression elastic deformation of the immobilized particles, while Sargassum thunbergii powder and activated carbon had almost no effect on the physical properties; But Sargassum thunbergii powder and activated carbon immobilized on the hydrophilic particles in water and significantly removed the the Zn2+ in water. When the amount of sodium alginate was 1%, polyvinyl alcohol, Sargassum thunbergii powder, the amount of activated carbon was 6%,15g/L, 1.5%, immobilized particles in water Zn2+ had a maximum adsorption.(2) According to the study of different factors on immobilized Sargassum thunbergii particles adsorb Zn2+, it's obvious that Zn2+ adsorption rate were influenced by pH, temperature, the amount of putting, reaction time and coexisting ions.When pH=6, the temperature is 30?, put the amount of 120g/L, the reaction time was 60min, it reached the maximum adsorption rate of single factor; Cu2+ compared to Cd2+ on Zn2+ adsorption rate, the impact was more obvious; under composite condition, when pH= 6, temperature is 35?, put the amount of 160g/L, Zn2+ adsorption rate could be maximized.(3) According to the particles in a fluidized reactor, when adjusting the flow rate 10ml�min-1, aeration rate of 30ml�min-1,the reactor of Zn2+ adsorption rate reached 83.6%, and the series reactor effluent was significantly higher than that a single reactor, in this way it achieved the purpose of managing.(4) In the process of immobilized desorption, desorption agent selection, desorption time, desorption agent concentration were all affected to the desorption rate, which indicated that HCl as desorbent immobilized particles with minimal damage; when the desorption time was 60min, HCl concentration 0.2mol/L, desorption rate reached the maximum; during the adsorption-desorption cycle, after three cycles, the adsorption rate of immobilized particles still reached 71.6%, with a good adsorption effect.Sargassum thunbergii had a good ability to accumulation of heavy metals. To be immobilized, Sargassum thunbergii not only kept its good capability of enrichment, but also recycled the adsorbent and heavy metal zinc. After many adsorption-desorption cycles, immobilized particles still had a higher adsorption rate for zinc ions, indicated that immobilized Sargassum thunbergii technique in zinc adsorption of heavy metal ions in the practical application was feasible.