An experimental sedimentation tank for enhancing the settling of solid particles

• Autorzy: Yaseen Dina A. , Abu-Alhail Saad , Mohammed Rusul N.

Identyfikatory

DOI

10.24425/jwld.2021.137097

• Języki publikacji: EN

Abstrakty

EN

Sedimentation tanks have a vital role in the overall efficiency of solid particles removal in treatment units. Therefore, an in-depth study these tanks is necessary to ensure high quality of water and increasing the system efficiency. In this work, an experimental rectangular sedimentation tank has been operated with and without a baffle to investigate the system behaviour and effectiveness for the reduction of solid particles. Turbid water was prepared using clay, which was collected from the water treatment plant of Al Maqal Port (Iraq), mixed with clear water in a plastic supply tank. Raw and outflow samples were tested against turbidity after plotting a calibration curve between inflow suspended solids versus their corresponding turbidity values. The key objective was to assess the impact of different flow rates, particle concentrations, heights and positions of the baffle on the system efficiency. Findings showed that the tank performance was enhanced significantly (p < 0.05) with the use of a baffle placed at a distance of 0.15 of tank length with height equal to 0.2 of tank depth. Higher removal efficiency (91%) was recorded at a lower flow rate (0.015 dm³∙s^–1) and higher concentration (1250 mg∙dm^–3), as the treatment efficiency enhanced by 34% compared with the operation without a baffle. Placing the baffle in the middle of the sedimentation tank produced the worst results. System efficiency for solids removal reduced with increasing baffle height. Further research is required to evaluate the efficiency of an inclined baffle.

Słowa kluczowe

EN

baffle; clay; secondary settling basin; solid particles; treatment plant; turbid water

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2021
• Tom: no. 49
• Strony: 63--73
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Yaseen Dina A.

• University of Basrah, College of Engineering, Department of Civil Engineering, P.O. Box 49, Basra city, 61004, Iraq

• https://orcid.org/0000-0002-0674-900X

autor

Abu-Alhail Saad

• University of Basrah, College of Engineering, Department of Civil Engineering, P.O. Box 49, Basra city, 61004, Iraq

• https://orcid.org/0000-0002-6545-7269

autor

Mohammed Rusul N.

• University of Basrah, College of Engineering, Department of Chemical Engineering, Basra city, Iraq

• https://orcid.org/0000-0002-9162-0947

Bibliografia

• AL-SAMMARRAEE M., CHAN A. 2009. Large-eddy simulations of particle sedimentation in a longitudinal sedimentation basin of a water treatment plant. Part 2: The effects of baffles. Chemical Engineering Journal. Vol. 152 p. 315–321. DOI 10.1016/j.cej. 2009.01.052.
• AL-SAMMARRAEE M., CHAN A., SALIM S.M., MAHABALESWAR U.S. 2009. Large-eddy simulations of particle sedimentation in a longitudinal sedimentation basin of a water treatment plant. Part I: Particle settling performance. Chemical Engineering Journal. Vol. 152 p. 307–314. DOI 10.1016/j.cej.2009.04.062.
• ASGHARZADEH H., FIROOZABADI B., AFSHIN H. 2011. Experimental investigation of effects of baffle configurations on the performance of a secondary sedimentation tank. Scientia Iranica. Vol. 18 p. 938–949. DOI 10.1016/j.scient.2011.07.005.
• EATON A.D., CLESCERI L.S., RICE E.W., GREENBERG A.E., FRAN-SON M.A.H. (eds.) 2005. Standard methods for the examination of water and wastewater. 21st ed. Washington DC. American Public Health Association/American Water Works Association/Water Environment Federation. ISBN 0875530478.
• FAN L., XU N., DONG Q., LIU Q., DING A. 2020. Investigation of activated sludge behavior in secondary sedimentation tanks by two models. Environmental Engineering Science. Vol. 37 p. 120–131. DOI 10.1089/ees.2019.0090.
• GOULA A.M., KOSTOGLOU M., KARAPANTSIOS T.D., ZOUBOULIS A.I. 2008. A CFD methodology for the design of sedimentation tanks in potable water treatment: Case study: The influence of a feed flow control baffle. Chemical Engineering Journal. Vol. 140 p. 110–121. DOI 10.1016/j.cej.2007.09.022.
• HEYDARI M.M., MEHRZADEGAN H.R. 2014. Effect of baffles on the flow and hydrodynamics of settling basins: A review. Journal of Agricultural Research. Vol. 52 p. 137–150.
• HUGGINS D.L., PIEDRAHITA R.H., RUMSEY T. 2005. Analysis of sediment transport modeling using computational fluid dynamics (CFD) for aquaculture raceways. Aquacultural Engineering. Vol. 31 p. 277–293. DOI 10.1016/j.aquaeng.2004. 05.007.
• JAWECKI B., PAWĘSKA K., SOBOTA M. 2017. Operating household wastewater treatment plants in the light of binding quality standards for wastewater discharged to water bodies or to soil. Journal of Water and Land Development. No. 32 p. 31–39. DOI 10.1515/jwld-2017-0004.
• JOVER-SMET M., MARTÍN-PASCUAL J., TRAPOTE A. 2017. Model of suspended solids removal in the primary sedimentation tanks for the treatment of urban wastewater. Water. Vol. 9, 448. DOI 10.3390/w9060448.
• KOWALCZYK A., SMOROŃ S., KOPACZ M. 2019. Influence of runoff of suspended solids on quality of surface water: Case study of the Szreniawa River. Journal of Water and Land Development. No. 41 (IV–VI) p. 83–90. DOI 10.2478/jwld-2019-0031.
• LIU X., GARCÍA M.H. 2011. Computational fluid dynamics modeling for the design of large primary settling tanks. Journal of Hydraulic Engineering. Vol. 137 p. 343–355. DOI 10.1061/ (ASCE)HY.1943-7900.0000313.
• MALCZEWSKA B., BICZYŃSKI A. 2017. Comparison between different models for rheological characterization of sludge from settling tank. Journal of Water and Land Development. No. 34 p. 191–196. DOI 10.1515/jwld-2017-0053.
• MALL A.K., SHRIRAM. 2014. Design modification of sedimentation tank. International Journal for Scientific Research & Development. Vol. 2(9) p. 821–825.
• NGUYEN T.-A., DAO N.T. M., TERASHIMA M., YASUI H. 2019. Improvement of suspended solids removal efficiency in sedimentation tanks by increasing settling area using computational fluid dynamics. Journal of Water and Environment Technology. Vol. 17 p. 420–431. DOI 10.2965/jwet.19-052
• PATZIGER M., KISS K. 2015. Towards a hydrodynamically enhanced design and operation of primary settling tanks–Results of a long term in situ measurement investigation program. Water and Environment Journal. Vol. 29 p. 338–345. DOI 10.1111/wej.12125.
• RAZMI A.M., BAKHTYAR R., FIROOZABADI B., BARRY D.A. 2013. Experiments and numerical modeling of baffle configuration effects on the performance of sedimentation tanks. Canadian Journal of Civil Engineering. Vol. 40 p. 140–150. DOI 10.1139/cjce-2012-0176.
• SAADY N.M. 2012. Effects of inclined plates and polyelectrolyte on the performance of settling tanks. Journal of Applied Sciences in Environmental Sanitation. Vol. 7 p. 35–42.
• SHAHROKHI M., ROSTAMI F., SAID M.A.M. 2013. Numerical modeling of baffle location effects on the flow pattern of primary sedimentation tanks. Applied Mathematical Modelling. Vol. 37 p. 4486–4496. DOI 10.1016/j.apm.2012.09.060.
• SHAHROKHI M., ROSTAMI F., SAID M.A.M., YAZDI S.R.S. 2012. The effect of number of baffles on the improvement efficiency of primary sedimentation tanks. Applied Mathematical Modelling. Vol. 36 p. 3725–3735. DOI 10.1016/j.apm.2011.11. 001.
• TAMAYOL A., FIROOZABADI B., ASHJARI M.A. 2010. Hydrodynamics of secondary settling tanks and increasing their performance using baffles. Journal of Environmental Engineering. Vol. 136 p. 32–39. DOI 10.1061/(ASCE)EE.1943-7870. 0000126.
• YOON T.H., LEE S.O. 2000. Numerical modeling of sedimentation basins with a baffle. KSCE Journal of Civil Engineering. Vol. 4 p. 227–232. DOI 10.1007/BF02823970.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).