Speciation of heavy metals (Cu, Cr, Pb, Ni, Cd and Zn) during anaerobic co-disposal of two distinct paper mill sludges viz. effluent treatment plant sludge and de-inking plant sludge with municipal solid waste in anaerobic landfill bioreactor was investigated. Effects of moisture content, volatile solids and pH on fractionation of heavy metals over the course of landfilling were also analyzed. Study revealed enhancement in bioavailability of Cu, Cr, Ni and Cd on sole disposal municipal solid waste in bioreactor landfill over 300 days. However, co-disposal of effluent treatment plant sludge with municipal solid waste showed reduction in bioavailability of every analyzed heavy metals with maximum increment in stable residual forms of Cu, Cr, Pb, Ni and Zn by 3.70%, 0.73%, 3.08%, 1.17% and 3.45% (dry weight), respectively. De-inking sludge co-disposal was also found effective for reducing bioavailability of Cu, Cd and Zn while bioavailability of Cr, Ni and Pb was unaltered. Strong correlations between increase in residual forms of heavy metals and volatile solid reduction obtained for both co-disposed bioreactors.

两种不同造纸厂污泥的厌氧共处理过程中重金属（铜，铬，铅，镍，镉和锌）的形态。研究了厌氧垃圾填埋生物反应器中城市生活垃圾的污水处理厂污泥和脱墨厂污泥。还分析了水分，挥发性固体和pH值对垃圾填埋过程中重金属分离的影响。研究表明，在300天的时间里，生物反应器垃圾填埋场中唯一处置的城市固体废物中Cu，Cr，Ni和Cd的生物利用度得到提高。然而，污水处理厂污泥与城市固体废物的共同处置表明，每种分析的重金属的生物利用度均下降，其中铜，铬，铅，镍，锌的稳定残留形式最大增加了3.70％，0.73％，3.08％，分别为1.17％和3.45％（干重）。还发现脱墨污泥共处置可有效降低Cu，Cd和Zn的生物利用度，而Cr，Ni和Pb的生物利用度保持不变。两种共置生物反应器中重金属残留形式的增加与挥发性固体减少之间的强相关性。