Characteristic of nutrients and polluting chemistry in dredged sludge

Characteristic of nutrients and polluting chemistry of dredged sludge from the Grand Canal were studied The result showed that the contents of nutrients were high in dredged sludge, but it was unbalance Contents of organic matter, phosphorus and potassium were high in dredged sludge, while that of nitrogen was low Decompose of organic matter was rapid when the dredged sludge applied to soil, while available phosphorus providing was permanent Contents of heavy metals in dredged sludge were significantly lower than sewage sludge and most of them lower than Agricultural Application Standard, so it is more economical to apply dredged sludge to land directly The available heavy metals in dredged sludge were low, relative active order was: Cd Cu Pb Zn Dredged sludge have harmful effect on seed germination when applied to soil by large amount, while the reaction of different kind of seed was significantly different It could be conclude that dredged sludge can be used as fertilizer or amendment to reclaim land when the species of plant and application rate are properly selected