Removal of Suspended Particles from Wastewater by Conventional Flotation and Floc-flotation

Öz

Bu çalışmada, askıda tane içeren atıksuya klasik flotasyon ve flok-flotasyonu yöntemlerinin uygulanması araştırılmıştır. Deneyler, Jameson flotasyon hücresinde iki aşamada yürütülmüştür. İki yöntemden elde edilen sonuçlar karşılaştırılmıştır. Aynı zamanda, ince tane uzaklaştırma etkinliği ve kalan bulanıklık üzerine flotasyon süresi ve polimer tipinin etkisi belirlenmiştir. Deneysel çalışmalar sonucunda, klasik flotasyona kıyasla flok-flotasyonu ile daha yüksek tane uzaklaştırma verimi ve daha düşük kalan bulanıklık değerlerinin elde edildiği bulunmuştur. Flotasyon süresini arttırmak, ince tanelerin yüzebilirliğini arttırmış ve bulanıklığı azaltmıştır. 1. aşama deneylerinde, 10 dak.flotasyon süresi sonunda anyonik polimer (SPP 508) ve anyonik toplayıcının (Aero 845) birlikte kullanılması ile %96.6 flotasyon verimi ve 304 NTU bulanıklık değeri elde edilmiştir. 2. Aşama deneylerinde flok-flotasyonu ile 10 dak. sonunda %98’in üzerinde yüzdürme verimleri elde edilmiştir. Atıksuyun kalan bulanıklık değeri, başlangıç bulanıklık değeri olan 12000 NTU’dan 78 NTU’ya anyonik polimer ile, 39 NTU’ya katyonik polimer ile ve 27 NTU’ya iyonlaşmayan polimer ile düşürülmüştür.

Anahtar Kelimeler

• Atıksu Arıtımı
• Flokülasyon
• Flotasyon
• Floc-flotasyonu

Removal of Suspended Particles from Wastewater by Conventional Flotation and Floc-flotation

Öz

In this study, the application of conventional flotation and floc-flotation methods to the wastewater containing suspended particles have been investigated. The experiments were carried out in two stages in the Jameson flotation Cell. The results obtained from the two methods were compared. The effect of flotation time and polymer type on the fine particle removal efficiency and residual turbidity was also determined. As a result of experimental studies, it was found that higher particle removal recovery and lower residual turbidity were obtained by floc-flotation compared to conventional flotation. Increasing flotation time increased fine particle floatability and decreased residual turbidity. In 1st stage of the experiments, 96.6% of the floatability recoveries and 304 NTU residual turbidity value was obtained with the combination of anionic polymer (SPP 508) and anionic surfactant (Aero 845) at the end of the 10 minutes flotation time. After 10 minutes of 2nd stage experiments, over 98% of floatability recoveries were obtained by floc flotation. The residual turbidity value of wastewater was decreased from the initial turbidity value of 12000 NTU to 78 NTU by anionic polymer, to 39 NTU by cationic polymer, and 27 NTU by a nonionic polymer.

Anahtar Kelimeler

• Wastewater treatment
• Flocculation
• Flotation
• Floc flotation

Kaynakça

1. Gregory, J., Particles in Water: Properties and Process, University College London, 2005, UK.
2. Oliveira, C., Rubio, J., “A Short overview of the formation of aerated of flocs and their applications in solid/liquid separation by flotation”, Minerals Engineering, 2012, 39: 124-132.
3. Colic, M., Morse, W., Miller, J.D., “The development and application of centrifugal flotation systems in wastewater treatment”, Int. J. Environment and Pollution, 2007, 30(2): 296-312.
4. Hocking, M.B., Klimchuk, K.A., Lowen, S., “Polymeric flocculants and flocculation”, Polymer Reviews, 1999, 39:2, 177-203.
5. Boltoa, B., Gregory, J., “Organic polyelectrolytes in water treatment”, Water Research, 2007, 41: 2301-2324.
6. Kitchener, J. A., “The froth flotation process: Past, Present, and Future, The scientific basis of flotation”, 1984, 3–52, Martinus Nijhoff Publishers, Hague, the Netherlands.
7. Collins, G.L., Jameson, G. J., “Experiments on the flotation of fine particles”, The Influence of Particle Size and Charge, Chemical Engineering Science, 1976, 31: 985-991.
8. Fuerstenau, D.W., “Fine particle flotation. In: fine particle processing”, Proceedings International Symposium, 1980, 1: 669–705.

9. Matis, K. A, Flotation Science and Engineering, 1995, 584 p, Marcel Dekker: New York.
10. Jameson, G.J., “Advances in fine and coarse particle flotation”, Canadian Metallurgical Quarterly, 2010, 49(4): 325-330.
11. Trahar, W.J., Warren, L.J., “The Floatability of fine particles- A review”, International Journal of Mineral Processing, 1976, 3: 103-131.
12. Tao, D., “Role of bubble size in flotation of coarse and fine particles- A review”, Separation Science and Technology, 2004, 39: 741-760.
13. Miettinen, T., Ralston, J. and Fornasiero D., “The limits of fine particle flotation”, Minerals Engineering, 2010, 23: 420–437.
14. Abd El-Rahiem, F.H., “Recent trends in the flotation of fine particles”, Journal of Mining Word Express, 2014, 3: 63-67.
15. Fuerstenau, M.C., Jameson, G., Yoon, R.H., Froth flotation, A Century of Innovation, Society for Mining Metallurgy & Exploration.
16. Taşdemir, T., Başaran, H.K., “Floatability of suspended particles from wastewater of natural stone processing by floc-flotation in mechanical cell”. El-Cezeri Journal of Science and Engineering, 2020, 7(2): 358-370.
17. Song, S., Lopez-Valdivieso, A., Reyes-Bahena, J.L., Lara-Valenzuela, C. “Floc flotation of galena and sphalerite fines. Minerals Engineering, 2001, 14(1): 87-98.
18. Sadowski, Z., Polowczyk, I., “Agglomerate flotation of fine oxide particles”, Int. J. Miner. Process, 2004, 74: 85-90.
19. Zhang, T., Qin, W., “Floc-flotation of jamesonit fines in aqueous suspensions induced by ammonium dibutyl dithiophosphate”, J. Cent. South Univ. 2015, 22: 1232-1240.
20. Chen, P., Li, H., Yi, H., Jia, F., Yang, L., Song, S., “Removal of graphene oxide from water by floc-flocculation”, Separation and Purification Technology, 2018, 202: 27-33.
21. Baichenko, A.A., Rulev, N.N. Baran, A.A., “Floccular micro flotation”, Journal of Mining Science, 1991, 27(6), 579-583.
22. Jameson, G.J., “A new concept in flotation column design”, In Sastry, K.V.S. (Ed.), Proceedings of the Column Flotation 1988, Annual Meeting, Society of Mining Engineering, 1988, Phoenix, Arizona.
23. Kılıc, H., “Treatment of natural stone wastewaters by flocculation and floc-flotation methods”, MSc Thesis, 2012, Eskişehir Osmangazi University, Turkey.
24. Başaran, H.K., Taşdemir, T., “Determination of flocculation characteristics of natural stone powder suspensions in the presence of different polymers”, Physicochemical Problems of Mineral Processing, 2014, 50(1): 169−184.
25. Rattanakawin, C., Hogg, R., “Aggregate size distributions in flocculation”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2001, 177: 87–98.
26. Hogg, R., “The role of polymer adsorption kinetics in flocculation”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1999, 146: 253–263.
27. Biggs, S., Habgood M., Jameson G.J., Yan Y., “Aggregate structures formed via a bridging flocculation mechanism”, Chemical Engineering Journal, 2000, 80: 13–22.
28. Jameson, G.J., “Hydrophobicity, and floc density in induced–air flotation for water treatment”, Physicochemical and Engineering Aspects, 1999, 151: 269-281.
29. Yan, Y.D., Jameson, G.J., “Application of the jameson cell technology for algae and phosphorus removal from maturation ponds”, Int. J. Miner. Process, 2004; 73: 23-28.
30. Taşdemir, T., Taşdemir, A., Geçgel, Y., “Removal of fine particles from wastewater using induced air flotation”, TOJSAT-The Online Journal of Science and Technology, 2011, 1(3): 14-22.