The Studies Of Garbage Percolate Treatment By Using Coagulation-absorption And Immobilized Photosynthetic-bacteria

City refuse landfill site percolate contains a complex organic pollutant component. It is high in CODcr & BOD5 and NH3-N is exceed 5000mg/L in most cases, so dose the heavy metal content, which is often 3-10times more than common sewage. Percolate sampled in liulitun city refuse landfill site of Beijing is pretreated by using coagulation, and. absorption In that process, we use 200mg/L FeCl3 as coagulant, whose effect is better than ALt(SO4)3 by comparison. CaO is also used as sedimentation aid reagent and 1.0% active carbon as sorbent The effect shows that CODcr removal rate of pretreated percolate is 30%, NH3-N removal rate is 21. 0% and BOD 5removal rate is 28. 6%.Mixed culture then is immobilized and different performance by using Polyvinyl alcohol(PVA) and Sodium aljinate as embedding medium is also studied. The result shows that 9%PVA can immobilize the Photosynthetic bacteria effectively, keeping relatively high physiological activity. Next, the optimum immobilization condition and parameters are determined.Finally the percolate is treated organically by using immobilized PSB-SBR method; we also choose the best operation and condition combination. The result shows that when water settle time is 72hours, CODcr input concentration is 8308mg/L, BOD5 input concentration is 2504mg/L, NH3-Ninput concentration is 1446mg/mL, sulfide input concentration is 8.0mg/mL, percolate CODcr removal rate is 82.6%, NH3-Nremoval rate is 98.6%, BOD5 removal rate is 79. 7% and removal sulfide rate is 97. 5% by using SBR.