The mobility and phytotoxicity of heavy metals in the sludge produced by municipal wastewater treatment plants are key environmental factors limiting the agricultural application of sludge. To reduce the mobility and phytoavailability of Cr, Ni, Zn and Cu, the effect of attapulgite as a stabilizer on metal stabilization in sludge was investigated. Loess soil amended with attapulgite-stabilized sludge was used to grow corn under greenhouse conditions. Attapulgite was most suitable for the stabilization of these metals because it reduced the mobile fraction while increasing the contents of the residual fractions. Meanwhile, attapulgite amendment significantly reduced the DTPA-extractable Cr, Ni and Zn concentrations in the sludge and the accumulation of heavy metals in corn, which increased the dry biomass of corn. The amounts of acid-soluble, reducible and oxidizable fractions in rhizosphere soils were significantly positively correlated with the heavy metal contents in corn, in contrast to the residual metals.

城市污水处理厂产生的污泥中重金属的迁移率和植物毒性是限制污泥在农业上应用的关键环境因素。为了降低Cr，Ni，Zn和Cu的迁移率和植物利用率，研究了凹凸棒石作为稳定剂对污泥中金属稳定性的影响。用凹凸棒土稳定的污泥改良的黄土土壤在温室条件下用于种植玉米。凹凸棒石最适合于这些金属的稳定化，因为它减少了流动部分，同时增加了残留部分的含量。同时，凹凸棒土改性剂显着降低了DTPA可提取的污泥中Cr，Ni和Zn的浓度以及玉米中重金属的积累，从而增加了玉米的干生物量。酸溶量