A Tentative Study On Synthetic Utilization Of Three Solid Wastes

On the base of construction convenience, the research utilizes the benthal mud, coal ash and alkali dreg, which abound in Tianjin Economy Technology Development Area, to mix the three solid wastes together to a new type of soil for landscaping. The best mixing proportion that Benthal mud : Alkali dreg : coal ash =X7 : Y7 : Z7( by volume) has been choosed out by indoor washing desalination experiment. The treatment has faster desalination speed, economic desalination water quota, and when it reached desalination standard, the salining properties is satisfy to plants surviving, it will not become alkali soil in the course of desalination, the pH didn't raised after the desalination, after the desalination, the density of ion contained in the treatment hasn't poison to the growth of plant, There hasn't heavy metal polluted either. The treatment may be used as gardening soil after desalination and fertilization.The indoor simulate desalination experiment showed, the absolute content of Na +, Cl, SO42-, K+, Mg2+, Ca2+ in the treatment reduced and HCO3- raised along with the desalination process, the opposite content of Na+, Cl-reduced and SO42-, K + , Mg2+, Ca2+, HCO3- raised long with the desalination process, the treatment salinity type from Na+-Cl- become to HCO3--Ca2+ after desalination. The content variety of Na+ and Cl- has marked correlation with the total salt content variety.Under the condition of accumulation water leaching process, the water salt movement trend of the section can be divided into three stages, the desalination stage of top layer, the desalination stage of salt peak move down and the desalination stage of bottom layer. The soil desalination depth depend on washing water amount, the more water used, the depther soil layer zhas been desalinated. The water quota is 0.84 ml/cm3soil, which can make 140cm soil layer reach desalination standard.