Through determining the specific resistance of sludge to evaluate the dewatering performance,the feasibility and economy of disposing the dredged sediment from a lake in Wuhan by mechanical dewatering method were discussed.

The change of the sludge particle size and the relation-ship between the sludge particle size and specific resistance of sludge were also discussed.

It is shown through the results adding fly ash is the best with a propriety grain size of 53μm(280) plus sieve,best adding 22g/100mL,the specific resistance of sludge 0.

The heat resistance of fouling in both tube is measured during a certain period.

Experimental investigation shows that the heat resistance of fouling in corrugated tube is 0.

Furthermore,the results of dynamic experiment indicate that,the fouling resistance decrease extraordinarily with treatment of high-voltage electrostatic field, and anti-fouling .

From the initial experiments, it is proved that this system can work well for long time and can measure the fouling resistance accurately.

The in-surface and out-surface vibrations which come from the flow-induce spring tube bundles, can not only effectively increase the convective heat transfer coefficient, but also decrease the fouling resistance, then increase the heat transfer coefficient remarkably.