The Effect of Fly Ash in Dewatering of Marble Processing Wastewaters

Authors: H. A. Taner, V. Önen

Abstract:

In the thermal power plants established to meet the energy need, lignite with low calorie and high ash content is used. Burning of these coals results in wastes such as fly ash, slag and flue gas. This constitutes a significant economic and environmental problems. However, fly ash can find evaluation opportunities in various sectors. In this study, the effectiveness of fly ash on suspended solid removal from marble processing wastewater containing high concentration of suspended solids was examined. Experiments were carried out for two different suspensions, marble and travertine. In the experiments, FeCl₃, Al₂(SO₄)₃ and anionic polymer A130 were used also to compare with fly ash. Coagulant/flocculant type/dosage, mixing time/speed and pH were the experimental parameters. The performances in the experimental studies were assessed with the change in the interface height during sedimentation resultant and turbidity values of treated water. The highest sedimentation efficiency was achieved with anionic flocculant. However, it was determined that fly ash can be used instead of FeCl₃ and Al₂(SO₄)₃ in the travertine plant as a coagulant.

Keywords: Dewatering, flocculant, fly ash, marble plant waste water.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.2643683

References:

[1] IMIB, Yıllık bazda maden ihracat verileri, Istanbul Maden İhracatçıları Birliği, Istanbul 2017.
[2] T.A. Gary, M.T. Perry, P.W. Conred, “Management of coal waste disposal for reduced environment impacts and for increased profits,” SME Preprint, pp. 94–127, 1994.
[3] N. E. Altun, C. Xiao, J. Y. Hwang, “Separation of unburned carbon from fly ash using a concurrent flotation column,” Fuel Processing Technology, 90, 1464-1470, 2009.
[4] ACAA, American Coal Ash Association, USA, 2018.
[5] M. Tokyay, K. Erdoğdu, “Türkiye termik santrallerinden elde edilen uçucu küllerin karakterizasyonu,” TÇMB, Ankara, 1998.
[6] S. Aytekin, “Uçucu küllerinin killi zeminlerin islahinda kullanimi,” Çukurova Üniversitesi Fen Bilimleri Ens. Y. Lisans Tezi, Adana, 2009.
[7] O. Bayat, B. Bayat, H. Vapur, V. Arslan, M. Uçurum, “Cam sanayi atıklarının uçucu kül ile koagülasyonu,” Mad. Dergisi, 44/3:19-24, 2005.
[8] L. Bingtao, L. Zhang, “Experimental Study on Wastewater Treatment by Fly Ash Coagulant,” International Conference on Electric Technology and Civil Engineering, China, 2011.
[9] H. Erşan, “Uçucu küllerin siltli zeminlerin kayma mukavemeti üzerine etkisi,” İTÜ Fen Bilimleri Enstitüsü, Y. Lisans Tezi, 75 s., İstanbul, 1996.
[10] A. Ozkan, M. Yekeler, “Coagulation and flocculation characteristics of celestite with different inorganic salts and polymers,” Chem. Eng. Process 43:873–879, 2004.
[11] M. Fan, R. C. Brown, J. V. Leeuwen, M. Nomura, Y. Zhuang, “The kinetics of producing sulfate-based complex coagulant from fly ash,” Chemical Engineering and Processing 42:1019/1025, 2003.