Abstract
A pot experiment was performed to study effects of application of metal rich sludge cocomposted with lime on soil physicochemical properties, ryegrass biomass and heavy metal uptake by ryegrass. The results show that application of sludge compost with (LSC) and without lime (SC) could increase the soil pH, and the organic matter, available N, P and K in soils, consequently, improve the growth of ryegrass. No significant differences were found in the plant growth between sludge composted with lime and without lime. Sludge compost rich in Zn and Cd resulted in two elementals accumulation in soil and plant. The content of Zn and Cd in ryegrass from LSC-treated soil was much lower than those from SC-treated soils at the same application rate. The results illustrated that lime was very effective in stabilizing Zn and Cd in compost. However, the fact that Cd in ryegrass from LSC treated soil was close to or even exceeded the guideline for the health standard of feed and food in China (GB 13078-2001) implied the limitation of liming in stabilization heavy metals in sludge.
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