Flyash disposal problems at thermal power stations - An experimental study

Citation
Es. Reddy et al., Flyash disposal problems at thermal power stations - An experimental study, INT J ENERG, 23(7), 1999, pp. 589-603
Citations number
10
Categorie Soggetti
Environmental Engineering & Energy
Journal title
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
ISSN journal
0363907X → ACNP
Volume
23
Issue
7
Year of publication
1999
Pages
589 - 603
Database
ISI
SICI code
0363-907X(19990610)23:7<589:FDPATP>2.0.ZU;2-H
Abstract
Disposal of flyash at thermal power stations is carried out in the form of ash slurry by mixing the ash with water. The ash slurry is stored in an ash pond. The water in the slurry is gradually drained out, through decanting wells, earthern embankments and over spillways, leaving the ash to deposit in the pond. It is observed that, the design of decanting wells presently being used all ows a considerable amount of flyash to flow out with water, leading to the contamination of soil and the water courses. Further, it is observed that, the failure of earthern bunds of ash ponds, which results in a major damage to the environment, is mainly due to ineffective functioning of filters in the bunds. This paper presents the details of an experimental investigation carried ou t to study the role of geotextiles in improving the performance of decantin g wells and earthern bunds. Two series of experiments were carried out. In the first series two model decanting wells were tested with geotextile lini ng. In the second series, a number of model earthern bunds were tested with and without geotextiles. Economics of providing geotextiles in earthen bun ds is studied. The results indicated that, the use of geotextiles is econom ical and effective in improving the performance of decanting wells and the earthen bunds of an ash pond. Copyright (C) 1999 John Wiley & Sons, Ltd.