Textile Sludge Based Bricks Production from Hawassa Industrial Park Zero Liquid Discharge Facility
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Date
2018-12
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Addis Ababa University
Abstract
Textile sludge is an inevitable byproduct discharged from wastewater treatment plants and becoming a great challenge in today’s industrial parks. Presently, the sludge generated from the ZLD facility is sent and collected inside nearby big constructed shed without any treatment. Since, the sludge is characterized by high level of organic and inorganic components including heavy metals, its accumulation is a burden to the industry and affects the environment and human well-being adversely. Hence, it demands an alternative sludge disposal method. Therefore, the main objective of this study was to investigate the physio-chemical sludge characteristics and suitability of utilizing sludge in the manufacture of bricks replacing natural clay the case of Hawassa industrial park. The test results revealed that concentration of BOD, COD and the principal heavy metals viz. Pb, Zn, Cr & Mn of the textile sludge were 535, 9820 mg/l and 2.25, 30.45, 8.08, 6.75 mg/kg respectively. Additionally, the proximate analysis of the sludge moisture content, VOM, ash and fixed carbon was 82.5, 48.4, 44 and 7.6 percent respectively. Similarly, the quantity of chemical constituents SiO2, Al2O3, CaO and Fe2O3 conducted by using chemical analysis methods, were 16.10, 21.40, 2.56 and 2.32 in percent respectively. The presence of these compounds indicates the potential use of this sludge as partial replacement of building materials. In this work, the effects of sludge proportion 10%, 15% and 20% by dry weight and firing temperature of 800℃, 900℃ and 1000℃, on the quality of the bricks (Water Absorption, and Compressive Strength) were examined and the results were compared with those of controlled bricks. From the results, the minimum values of compressive strength obtained was 2.93 N/mm2 at 20% and 800℃ whereas the maximum amount is 4.2 N/mm2 at 10% sludge mix and 1000℃. Again, the Water Absorption of 21.33% and 12.4% was gained at 20% and 10% sludge content. Moreover, the sludge amended up to 20% mixing ratio shows minimum leachability of heavy metals as performed by ICP-OES and compatible as compared to the USEPA standard. Consequently, the experiment work indicates the potential of textile sludge in the manufacturing of bricks.
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Keywords
Liquid Discharge Facility, Textile Sludge, Bricks Production, Hawassa Industrial Park