Characterization and Recycling of Textile Sludge Through Energy Efficient Brick Production, the Case of Hawassa Industrial Park
No Thumbnail Available
Date
2018-11-02
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Textile industry sludge from zero liquid discharge treatment plant of industrial parks in
Ethiopia faces environmental problem with no safe disposal options. One potential
opportunity for the disposal of sludge is by incorporating it in clay bricks, such
application can be practiced in a large scale in the country's brick-manufacturing
industry. Clay bricks were prepared with different proportions of sludge (10, 20, 30 and
40% by weight) in laboratory conditions and its properties such as strength, water
absorption, and weight loss on ignition were investigated. Results indicated that
increasing the sludge content in bricks resulted in a decrease in compressive strength.
However, the compressive strength was increased with the increase of firing temperature.
The compressive strength of textile sludge bricks was reduced significantly from 30.42 to
2MPa when textile sludge content increased from 0% to 40% fired at 1200 oC. Moreover,
it was estimated that an energy saving of 38% was achieved with 10% textile sludge
incorporated bricks during firing; this is due to the heating value of the textile sludge.
Toxic characteristics leaching procedure test results indicated that the leaching behavior
of targeted heavy metals has been found to be insignificant (P<0.01). The recommended
proportion of sludge in brick making can be 10% (by dry weight) and fired between 900
°C and 1200 °C for producing good quality bricks. This study indicated that textile sludge
can be sustainably stabilized and recycled in clay bricks and large-scale application of
this technique can be advised for Ethiopia where both the industrial parks and brick
industries benefits mutually.
Description
Keywords
Textile Sludge, Fired Clay Bricks, Stabilization,, Energy Efficient, Zero liquid discharge