中间覆盖层对厌氧生物反应器填埋场中有机物降解的作用

Effects of Intermediate Covers on Organics Degradation in Anaerobic Bioreactor Landfills

建立了3组模拟厌氧生物反应器填埋场——R1、R2和R3,其中R1反应器无中间覆盖层,R2和R3反应器分别以矿化垃圾+重质碳酸钙、矿化垃圾+天然沸石为中间覆盖层,以研究不同中间覆盖层对厌氧生物反应器填埋场中有机物降解的作用.结果表明:以矿化垃圾+重质碳酸钙、矿化垃圾+天然沸石为中间覆盖层时,均能维持反应器中良好的内环境,可促进垃圾和渗滤液中有机物的降解.R1、R2和R3反应器中垃圾的w(VS)(VS为挥发性固体))分别比初始值下降了69.81%、75.06%、73.86%,w(BDM)(BDM为生物可降解组分)分别下降了66.87%、82.86%、75.38%,w(纤维素)分别下降了67.96%、75.41%、72.90%;R1、R2和R3反应器中垃圾渗滤液的ρ(CODCr)比最大值分别降低了25.45%、29.72%、23.01%,ρ(BOD5)分别降低了39.28%、45.66%、46.74%.表明矿化垃圾+重质碳酸钙为中间覆盖层时,既能接种可降解有机物的微生物,又能提供微生物生长所需的碱度,因此更具优势.

Since intermediate cover is an important part of anaerobic bioreactor landfills, the permeability and chemical composition greatly affects the degradation of waste. In order to study the effects of intermediate covers on organics degradation in anaerobic bioreactor landfill, three sets of simulated anaerobic bioreactor landfills, R1, R2 and R3, were established. Intermediate covers of mineralized refuse with heavy calcium carbonate and mineralized refuse with natural zeolites were loaded into the R2 and R3, respectively. The results showed that VS, BDM and cellulose of waste in R1, R2 and R3 decreased by 69.81%, 75.06%, 73.86%, 66.87%, 82.86%, 75.38% and 67.96% , 75.41% , 72. 90% , respectively. Compared to the maximum values, the concentration of CODcr and BOD5 of leaehate in R1, R2 and R3 were reduced by 25.45%, 29.72%, 23.01% and 39.28%, 45.66%, 46.74%, respectively. In conclusion, mineralized refuse with heavy calcium carbonate and mineralized refuse with natural zeolites could create optimal environments in reactors to promote the degradation of organics in waste and leachate. Mineralized refuse with heavy calcium carbonate, which could inoculate microorganisms and provide alkalinity for microbial growth, showed the most advantage to accelerate the degradation of organics in anaerobic bioreactor landfill.