In this study, secondary municipal solid waste composts (SC) and wood vinegar treated secondary compost (WV-SC) was prepared to investigate the capability for single-heavy metals and multi-metal systems adsorption. The adsorption sequence of WV-SC for the maximum single metals sorption capacities was Cd (42.7 mg g⁻¹) > Cu (38.6 mg g⁻¹) > Zn (34.9 mg g⁻¹) > Ni (28.7 mg g⁻¹) and showed higher than that of SC adsorption isotherm. In binary/quaternary-metal systems, Ni adsorption showed a stronger inhibitory effect compared with Zn, Cd and Cu on both SC and WV-SC. According to Freundlich and Langmuir adsorption isotherm models, as well as desorption behaviors and speciation analysis of heavy metals, competitive adsorption behaviors were differed from single-metal adsorption. Especially, the three-dimensional simulation of competitive adsorption indicated that the Ni was easily exchanged and desorbed. The amount of exchangeable heavy metal fraction were in the lowest level for the metal-loaded adsorbents, composting treated by wood vinegar improved the adsorbed metals converted to the residue fraction. This was an essential start in estimating the multiple heavy metal adsorption behaviors of secondary composts, the results proved that wood vinegar was an effective additive to improve the composts quality and decrease the metal toxicity.

在这项研究中，准备了市政二次固体垃圾堆肥（SC）和木醋处理过的二次堆肥（WV-SC），以研究单重金属和多金属系统的吸附能力。WV-SC的最大单金属吸附能力吸附顺序为Cd（42.7 mg g ^-1）> Cu（38.6 mg g ^-1）> Zn（34.9 mg g ^-1）> Ni（28.7 mg g ^-1））并显示出高于SC的吸附等温线。在二元/四元金属体系中，与Zn，Cd和Cu相比，Ni对SC和WV-SC的吸附表现出更强的抑制作用。根据Freundlich和Langmuir的吸附等温线模型，以及重金属的解吸行为和形态分析，竞争性吸附行为不同于单金属吸附。特别是，竞争吸附的三维模拟表明，镍易于交换和解吸。对于负载金属的吸附剂，可交换的重金属部分含量最低，木醋处理的堆肥提高了吸附金属转化为残留部分的能力。这是估算次生堆肥对多种重金属的吸附行为的重要起点，