Effect of operating parameters on the performance of wastewater treatment plant (Case study: The south of Tehran wastewater treatment)

Document Type : Research Paper

Authors

1 Materials and Energy Research Center, Karaj, Iran

2 Arman Tadbir Palayesh Consulting Engineer Company, Tehran, Iran

Abstract

Despite the fact that there are wastewater treatment plants (WWTPs) currently operational across Iran and great advances have been made in this area, there are still problems in the design, construction, and operation of WWTPs with large nonlinear systems, varying flow rates, and pollution charges. The objective of this study was to investigate the effect of operating parameters including the return activated sludge (RAS) ratio, internal recycle (IR) ratio and dissolved oxygen (DO) concentration in an activated sludge system for the Modules 5&6 of the Southern Tehran WWTP. This study designed and simulated a plant based on the activated sludge model No.1 (ASM1) to determine the factors affecting wastewater treatment systems; then, the kinetic parameters were measured. The kinetic parameters such as the yield coefficient (Y), decay coefficient (Kd), maximum specific growth rate (K), and saturation constant (Ks) were in the range of 0.303-0.331g/g, 0.030-0.033d-1, 1.65-1.93d-1 and 37.6-44.92mg/l, respectively. The RAS ratios, IR ratios, and DO concentration varied from 0.2 to 2, 1 to 3.5, and 0.27 to 3.54 mg/l, respectively. The amount of RAS had the greatest impact on the effluent. The amounts of IR and DO concentration had no significant effect on the concentration of the five-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), and total suspended solids (TSS) in the effluent. After the RAS, the amount of IR had the most direct effect on reducing the effluent total nitrogen (TN) concentration. As a result, the overall removal efficiency increased up to 75% when the IR rate was 200% of the influent flow rate, the RAS rate was 90% of the influent flow rate, and the DO concentration in the first aeration unit was 2 mg/l considering the aeration cost. Therefore, proper operating parameters can provide the best quality of effluent that meets environmental standards.

Keywords

Main Subjects

References

[1] Najafpour, G., Sadeghpour, M., Lorestani, Z. A. (2007). Determination of kinetic parameters in activated sludge process for domestic wastewater treatment plant. Chemical industry and chemical engineering quarterly/CICEQ, 13(4), 211-215.
[2] Ekama, G. A., Sötemann, S. W., Wentzel, M. C. (2007). Biodegradability of activated sludge organics under anaerobic conditions. Water research, 41(1), 244-252.
[3] Emamjomeh, M. M., Tari, K., Jamali, H. A., Karyab, H., Hosseinkhani, M. (2017). Quality assessment of wastewater treatment plant effluents for discharge into the environment and reuse. Journal of Mazandaran university of medical sciences, 26(145), 283-292.
[4] Henze, M., Gujer, W., Mino, T., van Loosdrecht, M. C. (2000). Activated sludge models ASM1, ASM2, ASM2d and ASM3. IWA publishing.
[5] Mirbagheri, S., Saberi, S., Kalhor, K., Vakilian, R. (2014). Efficiency assessment of conventional and innovative wastewater treatment methods – case study: ekbatan wastewater treatment plant. The 7th Conference and Exhibition on Environmental Engineering (p. Verbally). Tehran: University of Tehran.
[6] Pons, M. N., Mourot, G., Ragot, J. (2011). Modeling and simulation of a carrousel for long-term operation. IFAC Proceedings Volumes, 44(1), 3806-3811.
[7] Zhang, Q. H., Yang, W. N., Ngo, H. H., Guo, W. S., Jin, P. K., Dzakpasu, M., Ao, D. (2016). Current status of urban wastewater treatment plants in China. Environment international, 92, 11-22
[8] Han, X., Zuo, Y. T., Hu, Y., Zhang, J., Zhou, M. X., Chen, M., Liu, A. L. (2018). Investigating the performance of three modified activated sludge processes treating municipal wastewater in organic pollutants removal and toxicity reduction. Ecotoxicology and environmental safety, 148, 729-737.
[9] Hosseini, B., Darzi, N. G., Sadeghpour, M., Asadi, M. (2008). The effect of the sludge recycle ratio in an activated sludge system for the treatment of Amol's industrial park wastewater. Chemical industry and chemical engineering quarterly/CICEQ, 96 14(3), 173-180.
[10] Noori, Z. (2018). Investigation of effluent quality of ekbatan wastewater treatment plant for farm and green space irrigation. Journal of land management   6(1) 95-102.
[11] Sewage Company, (2019). https://ts.tpww.ir/p18. Retrieved from https://ts.tpww.ir.
[12] APHA. (2005). Standard methods for the examination of water wastewater, Volume 21. Washington, DC: American public health association.
[13] Takács, I., Patry, G. G., Nolasco, D. (1991). A dynamic model of the clarification-thickening process. Water research, 25(10), 1263-1271.
[14] Derakhshan, Z., Mahvi, A. H., Ghaneian, M. T., Mazloomi, S. M., Faramarzian, M., Dehghani, M., Bahrami, S. (2018). Simultaneous removal of atrazine and organic matter from wastewater using anaerobic moving bed biofilm reactor: A performance analysis. Journal of environmental management, 209, 515-524.
[15] Faridnasr, M., Ghanbari, B., Sassani, A. (2016). Optimization of the moving-bed biofilm sequencing batch reactor (MBSBR) to control aeration time by kinetic computational modeling: simulated sugar-industry wastewater treatment. Bioresource technology, 208, 149-160.
[16] Du, X. J., Hao, X. H., Li, H. J., Ma, Y. W. (2011). Study on modelling and simulation of wastewater biochemical treatment activated sludge process. Asian journal of chemistry, 23(10), 4457.
[17] Alex, J., Benedetti, L., Copp, J., Gernaey, K. V., Jeppsson, U., Nopens, I., Vanrolleghem, P. (2008). Benchmark simulation model no. 1 (BSM1). Report by the IWA Taskgroup on benchmarking of control strategies for WWTPs, 19-20.
[18] Mardani, S., Mirbagheri, A., Amin, M., Ghasemian, M. (2011). Determination of biokinetic coefficients for activated sludge processes on municipal wastewater. Journal of environmental health Science Engineering, 8(1), 25-34.
[19] Metcalf, L., Eddy, H. (2003). Wastewater engineering: treatment, disposal, and reuse. New York: McGraw-Hill.
[20] Abyar, H., Younesi, H., Bahramifar, N., Zinatizadeh, A. A., Amini, M. (2017). Kinetic evaluation and process analysis of COD and nitrogen removal in UAASB bioreactor. Journal of the Taiwan institute of chemical engineers, 78, 272-281.
[21] Noroozi, A., Farhadian, M., Solaimanynazar, A. (2016). Kinetic coefficients for the domestic wastewater treatment using hybrid activated sludge process. Desalination and water treatment, 57(10), 4439-4446.
[22] Kordkandi, S. A., Khoshfetrat, A. B., Faramarzi, A. (2018). Performance modelling of a partially-aerated submerged fixed-film bioreactor: Mechanistic analysis versus semi data-driven method. Journal of industrial and engineering chemistry, 61, 398-406.
[23] Naghizadeh, A., Mahvi, A. H., Mesdaghinia, A. R., Sarkhosh, M. (2008, October). Bio-kinetic paramters in municipal wastewater treatment with a submerged membrane Reactor (SMBR). In proceeding of 12th national congress of environmental health.
[24] Mohammadi, P., Khashij, M., Takhtshahi, A., Mousavi, S. A. (2016). Performance Evaluation and Biokinetic Coefficients Determination of Activated Sludge Process of Sanandaj Wastewater Treatment Plant. Safety promotion and injury prevention, 4(2), 109-116.
[25] Sadeghi, M., Fadaei, A., Kheiri, S., Najafi-Chaleshtori, A., Shakeri, K. (2014). Investigation on bio kinetic coefficients for making biological treatment of wastewater treatment plants in cold region. Journal of Shahrekord uuniversity of medical sciences, 15. 41-52
[26] Delnavaz, M. (2017). Application of mathematical models for determination of microorganisms growth rate Kinetic coefficients for wastewater treatment plant evaluation. Journal of environmental health engineering, 4(3), 268-257.
[27] Noshadi, M., Ahadi, A. (2017). Determination of Kinetic coefficient of Shiraz municipal of wastewater treatment plant by batch reactor. Journal of civil and environmental engineering, 47, 63-73.
[28] "Environmental criteria for Reuse of recycle waters and treated wastewaters" (2011) related to participation "Iran Water Resources Management Company" (IWRMC) and" Country Management and Planning Organization" (CMAPO). Publication No. 535, Chapter 6, 85-110 (in Farsi).
[29] Basim, K., Ahmed, M. (2018). The Effect of MLSS values on removal of COD and phosphorus using control method of return activated sludge concentration. Journal of engineering and applied sciences, 13(22), 9730-9734.
[30] Hosseini, B., Darzi, N. G., Sadeghpour, M., Asadi, M. (2008). The effect of the sludge recycle ratio in an activated sludge system for the treatment of Amol's industrial park wastewater. Chemical industry and chemical engineering quarterly/CICEQ, 14(3), 173-180.
[31] Baeza, J. A., Gabriel, D., Lafuente, J. (2004). Effect of internal recycle on the nitrogen removal efficiency of an anaerobic/anoxic/oxic (A2/O) wastewater treatment plant (WWTP) Process biochemistry, 39(11), 1615-1624.
[32] Chen, Y. Z., Peng, Y. Z., Wang, J. H., Zhang, L. C. (2011). Effect of internal recycle ratio on nitrogen and phosphorus removal characteristics in A2/O-BAF process. Huan jing ke xue= Huanjing kexue, 32(1), 193-198.
[33] Ahn, Y. T., Kang, S. T., Chae, S. R., Lim, J. L., Lee, S. H., Shin, H. S. (2005). Effect of internal recycle rate on the high-strength nitrogen wastewater treatment in the combined UBF/MBR system. Water science and technology, 51(10), 241-247.
[34] Huang, J. S., Chou, H. H., Chen, C. M., Chiang, C. M. (2007). Effect of recycle-to-influent ratio on activities of nitrifiers and denitrifiers in a combined UASB–activated sludge reactor system. Chemosphere, 68(2), 382-388.
[35] Du, X., Wang, J., Jegatheesan, V., Shi, G. (2018). Dissolved oxygen control in activated sludge process using a neural network-based adaptive pid algorithm. Applied sciences, 8(2), 261.
[36] Meng, F., Yang, A., Zhang, G., Wang, H. (2017). Effects of dissolved oxygen concentration on photosynthetic bacteria wastewater treatment: Pollutants removal, cell growth and pigments production. Bioresource technology, 241, 993-997.
Advances in Environmental Technology
Volume 4, Issue 4
October 2018
Pages 211-221

Files

History

  • Receive Date: 21 December 2018
  • Revise Date: 12 June 2019
  • Accept Date: 15 June 2019

Share

How to cite

Statistics