Experimental Study On Bioactive Materials Treating Leachate Contaminants Of Groundwater

Build biological permeable reactive barrier （BPRB） to treat leachate contamination ofgroundwater for solve the problem of groundwater pollution with sulfate-reducing bacteria andactivated sludge, based on permeable reactive barrier, use tire rubber granule to be adsorptionmaterial and biological carrier.The pollution of treatment is COD, Fe²⁺, Mn²⁺, NH₄-N and SO₄^2-. Do the single factor andorthogonal experiment to study the adsorption and degradation of tire rubber granule andsulfate-reducing bacteria. Do the comparative study of SRBD and AS’s growth characteristicsand degradation effects. Constructed PRB with active material tire rubber granule, tire rubbergranule–SRBD, tire rubber granule-AS, do the scientific and systematic study on three PRBactive material’s repair effects and mechanism.The best reaction conditions of tire rubber granule:dosage of tire rubber granule is0.5g（200mL lab configuration water samples）, the reaction time is36h, the pH value is7, theoscillation frequency is100r min-1. Under these conditions, the removal of Fe2+is96%, theremoval efficiency of Mn²⁺is87%, removal efficiency of COD is51%, removal rate of NH₄-Nis30%, removal efficiency of SO₄^2-is10%. The best growing conditions for isolated andpurified from the activated sludge SRBD: inoculation of5%（100mL water samples）,temperature of37°C, pH value of7, and the carbon-sulfur ratio of2:1, the oscillation frequencyof50r/min, sulfate reduction rate can reach83%.Growth characteristics and pollutants degradation effects of SRBD and AS show that theSRBD50hours earlier than the AS into the logarithmic phase, and SO₄^2-degradation efficiencyhigher than AS.The removal efficiency of SO₄^2-, Fe²⁺, Mn²⁺, NH₄-N, COD are81%,95%,57%,27%,60%with SRBD, the removal efficiency of SO₄^2-, Fe²⁺, Mn²⁺, NH₄-N, COD are62%,95%,43%,52%,60%。Tire rubber granule, tire rubber granule–SRBD, tire rubber granule-AS for active materialsPRB test show that SO₄^2-and Mn²⁺’s best removal rate is in the tire rubber granule-SRBD system;COD and Fe²⁺removal rate is not very different in the two biologically active material, and theyare higher than t tire rubber granule; NH₄-N’s best removal effect is in the tire rubber granule-AS. Tire rubber granule, tire rubber granule–SRBD, tire rubber granule–AS’s removal rate ofSO₄^2-are10%86%,65%,10%, thire removal rate of Mn²⁺are45%,70%,52%, removal efficiency of COD are44%,77%,75%, removal rates of Fe²⁺are80%,97%,98%,removal ratesof NH₄-N are26%,24%,70%. Stability of the physical and chemical properties of tire rubbergranule can be biological carrier, although tire rubber granule is worse than bioactive material.These studies have shown that tire rubber granule have a certain specific surface area andmechanical strength, and two strains degrading pollutants is better than tire rubber granule, if theSO₄^2-and Mn²⁺are characterized by pollutants, select tire rubber granule-SRBD, if NH₄-N is thecharacteristics of pollutants, select the tire rubber granule-AS to repair, if COD and Fe²⁺arecharacterized by pollutants, both can be selected. According to the specific nature andcharacteristics of pollutants in groundwater select PRB active material.