Effect of dredging engineering on water environmental capacity of Lake Dongting;

Influence of sediment dredging on the ecotoxic effect of lake sediments;

Dredging and After-treatment of Deposits Contaminated by Minerals;

A simple talk on project of Changnian shipping that An to Mao course qixingdui beach dredge and construct;

The control project of MouShan Lake is introduced,including water supplying,flood control and ecology environment,and some relevant issues such as lake dredge,ecology repairing and water quality monitoring,etc.

Taking the home-made "1750m 3/h Cutter Suction Dredger" as the basis model dredge simulator, the cutter suction dredge simulator, which has an operating console similar to that in the operation cab of the basis dredger, is designed and manufactured.

Research on variety of plankton community prior and post sediment dredging in Nanhu Lake,Changchun;

Sediment dredging can effectively lower the contents of nutrient,heavy metals and persistent organic pollutants in sediment,but resuspensiou of sedi- ment during dredging will induce the release of pollutants from sediment to the water column.

Results show that the water quality of Nanhu lake in Changchun is significantly improved after sediment dredging from 2000 to 2002,and the indices of water quality in water lily area even reach or approach to the third level of GB3838-2002.

Ecosystem recovery scheme should firstly conduct precise ecological dredging in partial thin layer of heavy-polluted bed mud, which create a necessary eco-environment condition for further ecosystem recovery.

Some approaches to utilize dredged sediment as resource,such as land utilization,producting construction material and fill material and wastewater treatment material,were analysed.

Ferric trichloride and PAM were used to dewater the dredged sediment.