Title: Design of Cost-effective Coal Washery Effluent Treatment Plant for Clean Environment
Authors: Ghose, M K
Abstract: Coal washery effluents contain large
amounts of suspended solids and high COD values and they create serious water pollution
problem in which they are discharged. The solids in suspension are colloidal in
nature and possess high coking value. Thus in addition to water pollution and
siltation on the river bed, good quality of coking coal is being lost. It shows
the ineffectiveness of the present effluent treatment system. One large coal washery
has been surveyed and the characteristics of the effluent have been evaluated.
Treatability study for the removal of suspended solids has been conducted. The
effectiveness of the use of different conventional and synthetic
polymeric flocculates for the removal o f suspended solids have been evaluated.
Studies also involved the identification of a suitable flocculent and to
develop a methodology for the effective removal of suspended solids from the
effluent. A treatment scheme has been suggested which will make it feasible to
design a cost-effective treatment plant for coal washery and the supernatant
liquid can be recycled or safely discharged without causing surface water
pollution. It would maintain the acceptable balance between environmental
management and sustainable development of coal washeries in the region.
Page(s): 40-47
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