DEVELOPMENT OF TECHNOLOGY FOR DIFFERENT NATURE DREDGES CONCENTRATION AND SEPARATION FROM LIQUID WASTE

The treatment of different origin liquid wastes (LW) is nearly always concerned with the problems of insoluble suspended particles (dredges) concentration and removal. Diverse traditional methods of the filtering concentration are efficient enough for solving the problems, if the initial concentration of dredges in liquid solutions is not more than 1 g/l. There are many reasons for the LW clarification, but as a rule, the main one is the further waste handling. In this case, it means either the waste neutralization or the possible purposeful use of separated or extracted components. For the greater part, the liquid wastes are wastewater. Suspensions and pulps are the most problematic objects in the wastewater treatment. As a rule, the dispersible composition of dredges has a wide span. It considerably complicates the matching of clarification methods and the designing of technological equipment. The problem becomes moreover complicated, if there is the need for removing a considerable quantity of dredges with the insoluble particles of sizes from 1 µm up to 1000 µm and of a complex chemical composition and morphology. Within the bounds of the experimental-technological and experimental-design works being currently carried out, it is supposed to develop a universal approach to the treatment of liquid wastes (mainly wastewater) containing dredges in considerable quantities. After separation, the sludge (silt, pulp, residue, etc.) can be utilized or conditioned with the following either neutralization or storage or burial. The purified water can be recycled or headed into a general sewage disposal plant. This paper reports about exploratory studies, and therefore, it takes up only some aspects of the liquid wastes treatment technology being currently in the making.