The Preparation Method Of Adsorbents Using Granulated Blast Furnace Slag And The Applications In Environment Pollution Control

With the development of industrial production and the rapid development of the world economy,the government and the public have focused on the environmental problems.According to the pollution sources,there are air pollution,land pollution and water pollution,which directly hurt the public health and would endanger the survival and development of human.Depending on the source form is divided into air pollution and water pollution,land pollution,environmental pollution directly caused serious harm to people's health,and will continue to endanger human survival and development.Faced on the gradually more rigorous resource and environment,the government proposed green development,and built a resources-saving and environment-friendly society in the National Twelfth Five-Year Plan.And the government pointed out increased environmental strength and vigorously developed the circular economy approach.In the National Thirteenth Five-Year Plan,the government once more pointed out enlarges the strength of comprehensive ecological improvement and developed the research on the environmental technology and equipment.As an industrial solid waste,the utilization of blast furnace slag(BFS)declined because of cement market downturn.At present,BFS is mainly used in concrete,and it is primary stage in other application fields.So BFS problems would face major situation.How to utilize the BFS would become major issues and social concerns.In the paper,a new research direction on the utilization of industrial solid waste was proposed to manage pollution problems caused by excess water quenched BFS.There were two materials synthesized by BFS.One material(blast furnace slag acidizing solid,BFSAS)was porous,light and large specific surface.Another(blast furnace slag acid-alkali precipitation,BFSAP)was a composite material,which was light and flurry.These all were characterized by X-Ray Diffraction(XRD),scanning electron microscope(SEM),X-ray fluorescence(XRF),BET specific surface area(SSA)and Fourier transform infrared spectroscopy(FT-IR).These indicated that BFSAS is amorphous silica and BFSAP is a hybrid hydrotalcite,dominated by Mg and Al.In the study,BFS,BFSAS and BFSAP were applied to the dyeing wastewater and odors treatment in municipal wastewater treatment plant(WWTP).In the treatment of dyeing wastewater treatment,the decoloration efficiency of methyl orange was used to evaluate the adsorptive ability of three absorbents.The effects of adsorptive reaction conditions(pH and temperature of solution,reaction time,sorbent dosage and initial concentration)on methyl orange removal were also investigated in detail.And transfer behavior of odorous pollutants in wastewater sludge system under typical chemical conditioning processes for dewaterability enhancement was analyzed.The removal efficiency of volatile organic compounds(VOCs)was used to evaluate the adsorptive ability of three absorbents.And FT-IR was used to analysis the reaction mechanism of VOCs removal.The main conclusions about the paper were as follows:(1)In the paper,WQBFS was supplied by the ZhongYang Steel Co.,Ltd and its main chemical compositions were SiO2,Al2O3,Fe,MgO,CaO,in addition,it contained a small amount of heavy metals,e.g.MnO,TiO2.In detail,the waste blast furnace slag was treated and synthesized into three materials(BFSMP,BFSAS and BFSAP).The main composition of BFSAS was amorphous hydrated silica.The main composition of BFSAP was Mg6Al2(OH)16Cl·4H2O(7.84?).The BFSAS structure was well-fabricated by using acidizing method and exhibited appreciable textural parameters of specific surface area(245m2/g),pore sizes(3.5nm)and pore volumes(0.18cm3/g).And the BFSAP exhibited appreciable textural parameters of specific surface area(3.46 m2/g),pore size(15.40nm)and pore volume(0.013cm3/g).The BFSMP exhibited appreciable textural parameters of specific surface area(0.4 m2/g),pore size(4.70nm)and pore volume(0.005cm3/g).(2)BFSAS has been demonstrated to be an effective adsorbent for the removal of MO from aqueous solution.The effects of adsorptive reaction conditions(pH and temperature of solution,reaction time,sorbent dosage and initial concentration)on methyl orange removal were also investigated in detail.And the optimal conditions were that dosage=0.1g,reaction temperature=25?,time=25min,and pH=5.0~7.0.The adsorption processing followed the Langmuir isotherm and pseudo secondary order kinetics.The maximum adsorption capacity of BFSAP for MO reaches to 91mg/g.(3)BFSAP has been demonstrated to be an effective adsorbent for the removal of MO from aqueous solution.The effects of adsorptive reaction conditions(pH and temperature of solution,reaction time,sorbent dosage and initial concentration)on methyl orange removal were also investigated in detail.And the optimal conditions were that dosage=0.1g,reaction temperature=25?,time=25min,and pH=5.0~7.0.The adsorption processing followed the Langmuir isotherm and pseudo secondary order kinetics.The maximum adsorption capacity of BFSAP for MO reaches to 167mg/g.(4)The effects of inorganic anions on adsorptive removal of MO were investigated in the BFSAP section.Adsorption of liquid supernatant from Na2SO4 solution and saturated Na3PO4 solution was obviously reduced.That indicated a method about methyl orange recycling and BFSAP recovery.(5)According to the characteristics of volatile organic compounds(VOCs),VOCs in the experiment could be divided into benzene,halogenated benzene and halogenated hydrocarbons.BFSMP displayed a good removal effect on benzene and halogenated benzene(up to 100%),and less removal effect on halogenated hydrocarbon.Compared with BFSMP,BFSAS and BFSAP displayed less removal effect and organic matters.In the study,VOCs contained 31 organic gaseous substances.There were obviously phenomena of adsorption competition with each other.Because of different types and contents metals in the BFSMP,BFSAS and BFSAP,there was complexation between the metals and organic gas.Above all,the research results indicated that WQBFS was used to synthesize highly effective absorbents to treat environmental pollution.It not only developed the way of resource utilization of industrial solid waste,but also was applied in the dyeing wastewater treatment and odor management in WWTP.It was entirely conformed to the policy guidelines based on waste control by waste,which has good prospects for development,and further develops on the application of value.