In our country,dealing with sewage sludge scientifically and reasonably has become an important and urgent environmental problem.Land application of urban sewage sludge is the most promising way of the disposal.However,sludge contains a variety of heavy metals,organic contaminants and nutrients.It remains unclear whether these pollutants in the sludge may leach into soil and groundwater,and cause harm to human health.In this paper,the risk of heavy metals,organic contaminants and nutrients after the sludge ...