EFFECT of MICROWAVE and CONVEYOR DRYING on the DRYING CHARACTERISTICS, MODELING, and THERMAL PROPERTIES of MUNICIPAL WASTEWATER SLUDGE

Yıl 2021, Sayı: 047, 118 - 139, 31.12.2021

Tuğçe Ekici , Esra Tınmaz Köse , Soner Çelen

Öz

Wastewater treatment plant sludges are high moisture content sludges that during their storage and transport can cause various different problems. Therefore, a significant process is to dry these sludges. Based on drying times and energy consumption, microwave and conveyor drying methods for drying wastewater treatment plant sludge were examined in this study. Sludge weights of 20 g, 40 g and 60 g were used in the drying experiments carried out using two separate dryers. Microwave drying trials were performed at 360 W, 600 W and 800 W power, conveyor drying trials at temperatures of 60 ± 1 oC, 70 ± 1 oC and 90 ± 1 oC, at a fixed belt speed of 0,2 m/min. Energy consumption increased with the rise in microwave power as a consequence of the experiments. At 800 W and 60 g, the least energy consumption is measured as 0,015 kWh. In conveyor drying, on the other hand, drying time decreased with the rise in drying temperature, and energy consumption decreased. At 90 oC and 20 g, the least energy consumption was measured as 4,1 kWh. In terms of time and energy, the most appropriate of both drying systems was determined at 800 W. Furthermore, as a result of the statistical analysis, the most suitable model among five drying models was determined according to the χ2, es, and r criteria as Logarithmic and Henderson and Pabis.

Anahtar Kelimeler

Sewage Sludge, Microwave Drying System, Energy Consumption, Conveyor Drying System, Modeling

Kaynakça

• [1] Uzun, P. and Bilgili, U. (2011). Possibilities of using sewage sludge in agriculture, Journal of Agricultural Faculty of Uludag University, 25(2), 135-146.
• [2] Anonymous (2015). Management project final report of municipal sewage sludge-accession address: https://cygm.csb.gov.tr/evsel-kentsel-aritma-camurlarinin-yonetimi-projesi-duyuru-33959, Turkey (in Turkish).
• [3] Göçmez, S., (2006). Effects of İZSU municipal waste treatment sludge on microbial biomass and activity, some physical and chemical properties of soils in Menemen Plain. Ph.D Thesis, Ege University, İzmir, Turkey.
• [4] Dinçer, E. A. and Erbaş, M. (2019). Quality properties of dried meat products. The Journal of Food, 44 (3), 472-482.
• [5] Tınmaz Köse, E. (2019). Drying of drilling cutting: emphasis on energy consumption and thermal analysis. Processes, 46(3), 43-53.
• [6] Çelen, S. (2010). Modeling and drying of some food products in microwave and vacuum dryer. Ph.D Thesis, Trakya University, Edirne, 152p.
• [7] Ekici, T. (2019). Investigation of drying parameters of municipal wastewater sludge. MSc. Thesis, Tekirdağ Namık Kemal University. Tekirdağ, 114p.
• [8] Çelen, S., Haksever, A. and Moralar, A. (2017). The Effect of microwave energy to the drying of apple (gala) slices, Karaelmas Science and Engineering Journal, 7 (1), 228-236.
• [9] Çelen, S., Aktaş, T., Karabeyoğlu, S. S. and Akyıldız, A. (2015). Drying of prina using microwave energy and determination of appropriate thin layer drying model. Jotaf. 12(2), 21-31.
• [10] Omolola, A. O., Kapila, P. F. and Silungwe, H. M. (2019). Mathematical modeling of drying characteristics of Jew’s mallow (Corchorus olitorius) leaves, Informatıon Processing In Agriculture 6, 109–115.
• [11] Younis, M., Abdelkarim, D. and El-Abdein, A. Z. (2018). Kinetics and mathematical modeling of infrared thin-layer drying of garlic slices, Saudi Journal of Biological Sciences, 25(2), 332-338.
• [12] Miranda, M., Maureira, H., Rodriguez, K., Vega-Galvez, A. (2009). Influence of temperature on the drying kinetics, physicochemical properties, and antioxidant capacity of Aleo vera gel. Journal Food Engineering. 91(2), 297–304.
• [13] Ashtiani, S. M., Salarikia, A., Golzarian, M. R. (2017). Analyzing drying characteristics and modeling of thin layers of peppermint leaves under hot-air and infrared treatments. Inf Processing Agri. 4(2):128–39.
• [14] Zhu, X., Zhang, Z., Hinds, L. M., Sun, D. and Tiwari, B. K. (2021). Applications of ultrasound to enhance fluidized bed drying of Ascophyllum Nodosum: Drying kinetics and product quality assessment, Ultrasonics – Sonochemistry, 70, 105298.
• [15] Öztürk, İ. (2015). Katı Atık Yönetimi ve AB Uyumlu Uygulamaları, İSTAÇ Yayınları, Teknik Kitaplar Serisi. (Turkey). pp. 456. (in Turkish).
• [16] Tınmaz Köse, E., Çelen, S., Çelik, S. Ö., Akın, G. And Akyıldız, A. (2019). Drying of drilling sludge: Conventional and microwave drying. Hittite Journal of Science & Engineering. 6 (2), 119-122.
• [17] Tınmaz Köse, E., Çelen, S. and Çelik, S. Ö. (2019). Conventional and microwave drying of hydrocarbon cutting sludge. Environmental Progress & Sustainable Energy 38(4), 13104.