生物反应器填埋场中重金属固定和释放规律实验研究

Experimental study of heavy metal stabilization and release in bioreactor landfills

通过实验柱模拟生物反应器填埋场的完全厌氧状态与氧气入侵状态,用以研究填埋场完全厌氧稳定化过程及氧气介入的情况下重金属的固定与释放规律。结果表明:Cd、Mn、Ni、Pb和Zn,在厌氧降解完全结束时其滞留率分别达到70.2%、83.9%、90.6%、70%和95.7%。氧气的入侵不会增加Pb和Cd的活性,却促进了Mn、Ni和Zn的释放,但相对于固定总量来说,释放量不大。因此,生活垃圾对于重金属有很大的固定容量,且环境变化的冲击对填埋场重金属固定的影响较小。

Bioreactor landfills for municipal solid wastes were simulated in lab-scale reactors for both anaerobic and aerobic conditions to investigate the stabilization and release of heavy metals. The results show that the ultimate fixation ratios of Cd, Mn, Ni, Pb, and Zn in this experiment were 70.2%, 83.9%, 90. 6%, 70%, and 95.7%, respectively. Aerobic conditions did not activate Pb or Cd. Although oxygen increased the release of Mn, Ni, and Zn, the amounts were quite small compared with the total amount fixed in the wastes. The results show that treatment of municipal solid waste can fix large percentages of the heavy metals and that environmental disturbances have insignificant influences on the process.