Experimental Research On The Treatment Of Polluted Water Bodies By Strengthening The Magnetic Coagulation Process

Compared with the traditional coagulation process,magnetic coagulation has the advantages of fast,high efficiency and wide application range.It is a technology that has received wide attention in the fields of black and odorous water treatment,advanced treatment of sewage plants and emergency water treatment in recent years,but it still exists The limitation of poor removal of soluble pollutants in water.In this paper,by preparing composite magnetic adsorbents based on cheap adsorption materials,research on the efficiency and mechanism of the enhanced magnetic coagulation process for contaminated waters,and the dosage model fitting through experimental data,in order to enhance the magnetic coagulation process in polluted waters.Provide technical support for governance.The main findings of the thesis are as follows:Compared with the other six adsorbents,artificial zeolite has the best pollutant removal effect.Sodium chloride modification can further improve the pollutant removal efficiency.The co-precipitation method is used to prepare nano ferroferric oxide and the technical route of coupling artificial zeolite,and a new magnetic adsorbent—composite magnetic zeolite(CMZ)is prepared.The specific surface area,pore volume and pore diameter of CMZ are57.74 m²·g^-1,0.170 cm³·g^-1and 54.62 nm,respectively,which are significantly higher than the original artificial zeolite;both Fe₃O₄characteristic diffraction peaks and artificial zeolite appear in CMZ The characteristic diffraction peak,and its position has not changed significantly;Fe enters the framework structure of the artificial zeolite to form Fe—O—Si bonds;Fe₃O₄nanoparticles gather together to form a magnetic aggregate and wrap on the surface of the artificial zeolite;except for the basic elements of the artificial zeolite In addition,the iron distribution peak appeared in the CMZ,and its content was about 20%.Compared with coagulation and magnetic coagulation,CMZ enhanced coagulation significantly improves the removal of various types of pollutants.Compared with coagulation,the floc settling speed of magnetic coagulation and CMZ-enhanced coagulation are greatly increased;the addition of magnetic seed and CMZ can reduce the zeta potential of the particle surface and reduce the dosage of coagulant.For the selected black and odorous water body,CMZ was repeatedly used twice,and the removal capacity of ammonia nitrogen was greatly reduced;after as many as 12 repeated experiments,the total phosphorus remained at the removal of 85.2%of the total phosphorus in the water body,and the enhanced coagulation effect was significant.The removal of total phosphorus is mainly the removal of phosphate formed by iron ions and phosphate.The kinetic process of CMZ adsorption of ammonia nitrogen conforms to the zero-order kinetic model,with a maximum adsorption capacity of 1.737 mg/g;the process of total phosphorus adsorption can be fitted with a quasi-first or quasi-two kinetic model,with a maximum adsorption capacity of 1.995 mg/g.The adsorption of ammonia nitrogen by CMZ can be described by the Langmuir adsorption isotherm equation,the process is mainly endothermic and chemical adsorption;the adsorption of total phosphorus can be described by the Freundlich adsorption isotherm equation,the process is mainly exothermic and physical adsorption.The removal mechanism of CMZ on ammonia nitrogen mainly includes ion exchange and adsorption;the removal mechanism of total phosphorus mainly includes electrostatic adsorption,precipitation and ion exchange.Based on the experimental data,a fitting analysis of the CMZ dosage was carried out.The results showed that the correlation of the multiple linear regression model prediction was better,and the fitting equation model obtained was more applicable.