IMPROVEMENT OF THE MODE OF OPERATION OF BIOLOGICAL WASTEWATER TREATMENT FACILITIES
DOI:
https://doi.org/10.33042/2522-1809-2022-3-170-35-43Keywords:
aeration tank, secondary settling tank, sewage, ecological requirements, biological treatment.Abstract
Despite the strict requirements for wastewater quality, intensive pollution and accumulation of industrial pollution, potentially hazardous substances, continues in the places of wastewater discharge. Therefore, the aim of the study is to improve the operation of biological wastewater treatment plants to ensure compliance with environmental requirements. To achieve this goal, the features of wastewater treatment are analyzed and it is found that the treatment process depends on the concentration of activated sludge, the amount of air and the properties of the wastewater entering the treatment. With this in mind, it is proposed to adjust the ratio of "sewage active sludge air" to ensure compliance with environmental requirements. Factors influencing the cleaning process are also identified. Such factors are the consumption of wastewater coming for treatment, oxygen saturation of the mixture of activated sludge and wastewater, the quantity and quality of activated sludge fed into the aeration tank. In addition, the peculiarities of the processes occurring in different parts of the buildings are taken into account, and it is proposed to divide the cleaning process into two stages. The first stage takes place in the first corridor of the aeration tank (regenerator), where the activated sludge enters for regeneration. The second stage covers the second or third corridors of the aeration tank and the secondary settling tank, where the wastewater is first mixed with activated sludge, then the mixture is discharged to the secondary settling tank. An experimental study of the cleaning process was carried out, as a result of which the necessary data for the mathematical description of the processes were obtained. After processing the experimental data, regression equations were obtained that describe the purification processes in the system "aeration tank-displacer - secondary settling tank", namely the change in the concentration of activated sludge at the outlet of the regenerator and the change in the concentration of contaminants in the purified water. The adequacy of the equations was checked according to Fisher's test. It was found that the equations are adequate to real processes within the accepted conditions and assumptions. Analytical solutions of the obtained equations allow to analyze the course of purification processes at different stages, to determine the influence of factors on the process. A procedure for the use of equations is proposed, which allows without additional experiments to choose the mode of operation of biological treatment facilities, which will ensure compliance with environmental requirements.
References
National report on the state of the environment in Ukraine in 2020. URL: https://mepr.gov.ua/news/38840.html [in Ukrainian]
About the Main Directions of the State Policy of Ukraine in the Field of Environmental Protection, Use of Natural Resources and Ensuring Environmental Safety. URL: https://zakon.rada.gov.ua/laws/show/188/98-%D0%B2%D1%80#Text [in Ukrainian]
Law of Ukraine «On Environmental Protection». URL: http://zakon.rada.gov.ua/laws/show/1264-12 [in Ukrainian]
Epoian, S.M, Hopchak, I.V., Sorokina, T.S., Airapetian, T.S., & Zhuk, V.M. (2021). Determination of water capacity of Ukrainian economy. Scientific Bulletin of Construction,105(3), 214–219. [in Ukrainian]
Khare, Y.P., Naja, G.M., Paudel, R., & Martinez, C.J. (2020). A watershed scale assessment of phosphorus remediation strategies for achieving water quality restoration targets in the western Everglades. Ecological Engineering, 143, 105663. DOI: https://doi.org/10.1016/j.ecoleng.2019.105663
Jing, S. Chan, Phaik, E. Poh, Mohd-Zulhilmi, P. Ismadi, Leslie, Y. Yeo, & Ming, K. Tan. (2021). Acoustic enhancement of aerobic greywater treatment processes. Journal of Water Process Engineering, 44. DOI: https://doi.org/10.1016/j.jwpe.2021.102321
Muoio, R., Palli, L., Ducci, I., Coppini, E., Bettazzi, E., Daddi, D., Fibbi, D., & Gori R. (2019). Optimization of a large industrial wastewater treatment plant using a modeling approach: A case study. Journal of Environmental Management, 249, 109436. DOI: https://doi.org/10.1016/j.jenvman.2019.109436
Chen, W.-H., Lin, S.-J., Lee, F.-C, Chen, M.-H., Yeh, T.Y., & Kao, C.M. (2017). Comparing volatile organic compound emissions during equalization in wastewater treatment between the flux-chamber and mass-transfer methods. Process Safety and Environmental Protection, 109, 410–419. DOI: https://doi.org/10.1016/j.psep.2017.04.023
Wei, Li, Jiamin, Liu, Yuming, Zhen, Minghui, Lin, Xiuting, Sui, Wanying, Zhao, Xiuchen, Bing, Jianguo, Lin, & Liming, Zhai. (2021). Simultaneous removal of nitrite and organics in a biofilm-enhanced high-salt wastewater treatment system via mixotrophic denitrification coupled with sulfate reduction. Journal of Water Process Engineering, 40. DOI: https://doi.org/10.1016/j.jwpe.2021.101976
El-Rawya, M., Khaled Abd-Ellah, M., Fathid, H., Khaled Abdella Ahmed, A. (2021). Forecasting effluent and performance of wastewater treatment plant using different machine learning techniques. Journal of Water Process Engineering, 44. DOI: https://doi.org/10.1016/j.jwpe.2021.102380
Krainiukov, О.M., Timchenko, V.D. (2018). Economic consequences of anthropogenic water pollution (by using pechenizky reservoir as an example). Visnyk of V.N. Karazin Kharkiv National University Series «Ecоlogy», 19, 66–74.
Oleynyk, O.Ya., & Airapetian, T.S. (2019). Practical recommendations to oxygen calculationmodes for biological strain water treatmentin aerothenes with closed and referring bioecenosis. Municipal economy of cities, 1(147), 175–180. [in Ukrainian]
Molchan, A.P., Gorban, D.G., & Gornostal, S.A. (2021). Compliance with environmental requirements for urban wastewater treatment. Priority directions and vectors of world science development: materials II Int. stud. Science. conf. (Т. 2), Drogobych, 30–33. [in Ukrainian]
Dubovoy, V.М., Kvetniy, R.N., Mihaylov, О.І., & Usova, А.V. (2017). System modeling and optimization. Vinnica, PP «TD Edelveys». [in Ukrainian]
Pavlenko, P.M., Filonenko, S.F., Cherednikov, О.М., & Treytyak, V.V. (2017). Mathematical modeling of systems and processes. Кiеv, NAU. [in Ukrainian]
Gorban, D., Molchan, A., & Gornostal, S. (2022). Protection of water bodies from pollution by insufficiently treated wastewater. Problems and prospects of security system development vital activity: Collection of scientific papers ХVІI International scientific-practical conference by young scientists, cadets and students. Lviv, 201–205. [in Ukrainian]
Downloads
Published
How to Cite
Issue
Section
License
The authors who publish in this collection agree with the following terms:
• The authors reserve the right to authorship of their work and give the magazine the right to first publish this work under the terms of license CC BY-NC-ND 4.0 (with the Designation of Authorship - Non-Commercial - Without Derivatives 4.0 International), which allows others to freely distribute the published work with a mandatory reference to the authors of the original work and the first publication of the work in this magazine.
• Authors have the right to make independent extra-exclusive work agreements in the form in which they were published by this magazine (for example, posting work in an electronic repository of an institution or publishing as part of a monograph), provided that the link to the first publication of the work in this journal is maintained. .
• Journal policy allows and encourages the publication of manuscripts on the Internet (for example, in institutions' repositories or on personal websites), both before the publication of this manuscript and during its editorial work, as it contributes to the emergence of productive scientific discussion and positively affects the efficiency and dynamics of the citation of the published work (see The Effect of Open Access).