制取生物柴油产生的粗甘油对污泥厌氧消化的影响

Effect of Adding Crude Glycerol from Biodiesel Production on Anaerobic Digestion of Excess Sludge

针对污泥制取生物柴油过程中产生的粗甘油废弃化问题及剩余污泥减量化和资源化需求,探讨了添加粗甘油对剩余污泥厌氧消化的影响。在厌氧污泥最佳接种量试验基础上,进行了不同粗甘油添加量(0. 5～2. 0 g/L)对剩余污泥厌氧消化产气、污泥减量、有机物转化及系统稳定性的影响研究。结果表明,厌氧污泥接种量为30%时最佳,此时剩余污泥厌氧消化累积产气量及VS减量率分别可达171. 1 m L/gVS和24. 13%。其次,不同粗甘油添加量均可促进剩余污泥厌氧消化过程,且添加量为0. 5 g/L时,累积产气量达197. 6 m L/gVS,且其中的甲烷平均比例高达70. 2%,厌氧消化系统对TCOD、TS、SCOD和VS的去除率分别达到26. 82%、19. 49%、50. 11%和27. 44%,此时pH值波动范围为6. 96～7. 70。因此,添加粗甘油对剩余污泥厌氧消化具有促进作用,其最佳添加量为0. 5 g/L。

Facing the problem of crude glycerol during biodiesel production from the sludge and the requirements of excess sludge for reduction and anaerobic digestion of excess sludge were studied. inoculation amount, the effects of different dosages resource, the effects of crude glycerol addition on the Based on the optimal experiment of anaerobic sludge of crude glycerol （0.5 - 2.0 g/L） on biogas yield, sludge reduction, transformation of organic matter and system stability during the anaerobic digestion of excess sludge were investigated. The results indicated that the optimal inoculation amount of anaerobic sludge was 30%. The cumulative biogas yield and the VS reduction rate could reach 171.1 mL/gVS and 24.13% respectively during the anaerobic digestion of excess sludge with 30% inoculation amount. Sec- ondly, all the dosages of crude glycerol could promote the anaerobic digestion process of excess sludge and the optimal dosage of crude glycerol was 0.5 g/L. Under this dosage, the cumulative biogas yield reached 197.6 mL/gVS, in which the methane could account for 70.2%. At the same time, the removal rates of TCOD, TS, SCOD and VS in the anaerobic digestion system reached 26. 82%, 19.49%,50.11% and 27.44% respectively, while the pH value fluctuated within the range of 6.96 -7.70. Therefore, the addition of crude glycerol can promote the anaerobic digestion of excess sludge, and the optimum addition was 0.5 g/L.