| abstract |
In dewatering sludge, which is formed in a process of biologically treating various industrial effluents or the like, by using an electroosmotic dewatering device, the electroosmotic dewatering treatment can be efficiently carried out while minimizing the cost for chemicals and requiring no additional element, such as a dissolution tank or a heater, or no extra energy. Concentrated salts discharged from an effluent treatment plant are added to sludge and then dewatering is carried out by using an electroosmotic dewatering device. By adding the concentrated salts discharged from the effluent treatment plant, which have been discarded as an industrial waste, to the sludge to be electroosmotically dewatered, the electrical conductivity of the sludge can be increased and the dewatering efficiency of the electroosmotic dewatering device can be increased. Thus, the water content of the dewatered sludge thus obtained can be lowered. |