[01] Ebrahim Khosravian, Department of Chemical Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran. [02] Farshad Farahbod, Department of Chemical Engineering, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran.

The pre-treatment of wastewater with mineral coagulant of ferric oxide is investigated experimentally in this work. Non-volatile suspended solids (NVSS) and volatile suspended solids (VSS) beside other important parameters, total hardness, and chemical oxygen demands, and biochemical oxygen demands, pH value after sedimentation and pH after coagulation in aerobic treatment are surveyed due to the changes in fast mixing rate. Fast mixing rate in first coagulation tank changes in values of 50, 60, 70, 80, 90, 110, 140, 160, 190 and 200 rpm. Results show the different values of parameters according to different values of fast mixing rates.

Treatment, Non-volatile Suspended, Volatile Suspended, Chemical Oxygen Demand, Biochemical Oxygen Demand, Coagulation

[01] Boelee, N. C., Temmink, H., Janssen, M., Buisman, C. J. N., Wijffels, R. H., 2011. Nitrogen and phosphorus removal from municipal wastewater effluent using microalgal biofilms. Water Research 45 (18), 5925-5933. [02] Ericsson, B., Hallmans, B., 1996. Treatment of saline wastewater for zero discharge at the Debiensko coal mines in Poland. Desalination 105 (1-2), 115-123. [03] Farahbod, F., Mowla, D., Jafari Nasr, M. R., Soltanieh, M., 2011. Experimental study of forced circulation evaporator in zero discharge desalination process. Desalination, in press. [04] Galán, O., Grosso, M., Baratti, R., Romagnoli, J. A., 2010. Stochastic approach for the calculation of anti-solvent addition policies in crystallization operations: An application to a bench-scale semi-batch crystallizer. Chemical Engineering Science 65 (5), 1797-1810. [05] Hatt, J. W., Germain, E., Judd, S. J. 2011. Precoagulation-microfiltration for wastewater reuse. Water Research 45 (19), 6471-6478. [06] Izquierdo, F., Castro Hermida, J. A., Fenoy, S., 2011. Detection of microsporidia in drinking water, wastewater and recreational rivers. Water Research 45 (16), 4837-484. [07] R. Saliba, Callieris R., D’Agostino D., Roma R., Scardigno A., Stakeholders’ attitude towards the reuse of treated wastewater for irrigation in Mediterranean agriculture, Agricultural Water Management, Volume 204, 31 May 2018, Pages 60-68. [08] Kim, D., 2011. A review of desalting process techniques and economic analysis of the recovery of salts from retentates. Desalination 270 (1-3), 1-8. [09] Koay, G., Chuah, T., Zainal-Abidin, S., Ahmad, S., Choong, T., 2011. Solvent crystallization of palm based dihydroxystearic acid with isopropyl alcohol: Effects of solvent quantity and concentration on particle size distribution, crystal habit and morphology, and resultant crystal purity, Industrial Crops and Products. 34 (1), 1135-1140. [10] Logan, L. A., Fragenan, N., Bidger, D. W. L., Mich, U., 1934. Liquid Film Heat-Transfer Coefficients in a vertical-Tube Forced- Circulation Evaporator. Industrial and Engineering Chemistry 26 (10), 1044-1047. [11] Bashiri Batoul, Fallah Narges, Bonakdarpour Babak, Elyasi Shilan, The development of aerobic granules from slaughterhouse wastewater in treating real dyeing wastewater by Sequencing Batch Reactor (SBR), Journal of Environmental Chemical Engineering, In press, accepted manuscript, Available online 12 May 2018. [12] Macedonio, F., Katzir, L., Geisma, N., Simone, S., Drioli, E., Gilron, J., 2011. Wind-Aided Intensified evaporation (WAIV) and Membrane Crystallizer (MCr) integrated brackish water desalination process: Advantages and drawbacks. Desalination 273 (1), 127-135. [13] McCabe & Smith, 2000, Unit Operations of Chemical Engineering, 97-99, McGraw-Hill, New York. [14] Plewik, R., Synowiec, P., Wójcik, J., Kuś, A., 2011. Suspension flow in crystallizer with and without hydraulic classification. Chemical Engineering Research and Design 88 (9), 1194-1199. [15] Rodriguez-Garcia, G., Molinos-Senante, M., Hospido, A., Hernández-Sancho, F., Moreira, M. T., Feijoo, G., 2011. Environmental and economic profile of six typologies of wastewater treatment plants. Water Research 45 (18), 5997-6010. [16] Santosa, Sri Juari, Kunarti, Eko, Karmanto, Sri, 2013. Synthesis and utilization of Mg/Al hydrotalcite for removing dissolved humic acid, Applied Surface Science 254, 7612–7617. [17] W. P. Cheng, Comparison of hydrolysis/coagulation behaviour of polymeric and monomeric iron coagulants in humic acid solution, Chemosphere 47 (2013) 963–969. [18] Abrahamson, A. B. I., Brunstrom, B., Sundt, R. C., Jorgensen, E. H., 2008. Monitoring contaminants from oil production at sea by measuring gill EROD activity in Atlantic cod (Gadus morhua). Environ. Pollut. 153, 169e175. [19] Esmaeilzadeh, F., Goodarznia, I., 2005. Supercritical extraction of phenanthrene in the crossover region, J. Chemical Engineering Data 50, 49–51. [20] Toczyłowska-Mamińska Renata, Szymona Karolina, Kloch Monika, Bioelectricity production from wood hydrothermal-treatment wastewater: Enhanced power generation in MFC-fed mixed wastewaters, Science of The Total Environment, Volume 634, 1 September 2018, Pages 586-594. [21] Beyer, J., Jonsson, G., Porte, C., Krahn, M. M., Ariese, F., 2010. Analytical methods for determining metabolites of polycyclic aromatic hydrocarbon (PAH) pollutants in fish bile: a review. Environ. Toxicol. Pharmacol. 30, 224e244. [22] Bohne-Kjersem, A., Skadsheim, A., Goksoyr, A., Grosvik, B. E., 2009. Candidate biomarker discovery in plasma of juvenile cod (Gadus morhua) exposed to crude North Sea oil, alkyl phenols and polycyclic aromatic hydrocarbons (PAHs). Mar. Environ. Res. 68, 268e277. [23] Duan, J., Gregory, John a, 2010. coagulation by hydrolysing metal salts, Advances in Colloid and Interface Science 100, 475–502. [24] Ibrahimoglu Beycan, Yilmazoglu M. Zeki, Disposal of olive mill wastewater with DC arc plasma method, Journal of Environmental Management, Volume 217, 1 July 2018, Pages 727-734. [25] Jiang Jia-Qian, Loyd Barry, 2013. Progress in the development and use of ferrate (VI) salt as an oxidant and coagulant for water and wastewater treatment, Water Research 36 1397–1408. [26] Abdou, M. I., Al-sabagh, A. M., Dardir, M. M., 2013. Evaluation of Egyptian bentonite and nano-bentonite as drilling mud, Egyptian J. Petroleum 25, 53–59. [27] Zouboulis A. I., Moussas P. A., Vasilakou F., 2013. Polyferric sulphate: preparation, characterization and application in coagulation experiments, Journal of Hazardous Materials 155 (3), 459–468. [28] Cheng, W. P., 2012. Hydrolytic characteristics of polyferric sulphate and its application in surface water treatment, Separation Science and Technology 36 (10), 2265–2277. [29] Fan M., Sung S., Brown R. C., Wheelock T. D., Laabs F. C., 2013. Synthesis, characterization and coagulation of polymeric ferric sulphate, Journal of Environment Engineering 128 (6), 483–490. [30] Su Fangli, Dong Linlin, Li Haifu, Wang Tieliang, Influence of Paper Mill wastewater on Reed Chlorophyll Content and Biomass, Physics and Chemistry of the Earth, Parts A/B/C, In press, accepted manuscript, Available online 5 June 2018. [31] Leprince A., Flessinger F., Bottero J. Y., 1987. Polymerised iron chloride: an improved inorganic coagulant, Journal of the American Water Works Association 76, 93–97. [32] Zouboulis A. I., Moussas P. A., 2013. Polyferric silicate sulphate (PFSiS): preparation, characterisation and coagulation behaviour, Desalination 224, 307–316. [33] Gao B., Yue Q., Zhao H., Song Y., 2013. Properties and evaluation of polyferric silicate sulfate (PFSS) coagulant as a coagulant for water treatment, in: H. H. Hahn, E. Hofmann, H. Odegaard (Eds.), Chemical Water and Wastewater Treatment VI, Springer-Verlag, Berlin, pp. 15–22. [34] Da Zhao, Yang Lu, Zhang Xinyan, Li Dong, Optical constants of oilfield wastewater, Optik, Volume 167, August 2018, Pages 37-41. [35] Goodarznia, I., Esmaeilzadeh, F., 2006. Treatment of oil-contaminated drill cuttings of south pars gas field in Iran using supercritical carbon dioxide, Iranian J. Science & Technology, Transaction B, Engineering 30, 607–611. [36] Fu, Y., Yu, S. L., 2011. Exterior shapes and coagulation performance of solid poly ferricsilicic sulfate, Environmental Chemistry 25 (4), 471–476. [37] Fu, Y., Yu, S. L., 2010. Characterization and coagulation performance of solid poly silicicferric (PSF) coagulant, Journal of Non-crystalline Solid 353, 2206–2213. [38] Ghazi M., Quaranta G., Duplay G., Hadjamor R., Khodja M., Amar H. A., Kes-saissia Z., 2011. Life-cycle impact assessment of oil drilling mud system in Algerian arid area, Resources, Conservation and Recycling 55, 1222–1231. [39] Issoufi, I., Rhykerd, R. L., Smiciklas, K D., 2006. Seedling growth of agronomic crops in crude oil contaminated soil. Journal of Agronomy and Crop Science 192, 310–317. [40] Amuda O. S., Amoo I. A., 2013. Coagulation/flocculation process and sludge conditioning in beverage industrial wastewater treatment, Journal of Hazardous Materials 141, 778–783.