Wastewater treatment plant reconstruction of KP "Storozhynetske housing and communal economy" in Storozhynets, Chernivtsi Region
Students Name: Melnychuk Andrii Vasylovych
Qualification Level: magister
Speciality: Water Supply and Sewerage System
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2023-2024 н.р.
Language of Defence: ukrainian
Abstract: The communal enterprise "Storozhynecke HCS " in Storozhynech provided a master plan for wastewater treatment facilities, their current condition, and the tasks for reconstruction. The main drawback of the existing treatment facilities includes complete wear of technological equipment and pipelines, inefficient use of existing facilities due to reduced wastewater volumes, inadequate purification effectiveness before discharge into the river, and the deterioration of reinforced concrete and metal structures of buildings and technological units. The scheme of treatment facilities is traditional, comprising an inlet chamber, a screening compartment, a biological treatment block (aerating tank for complete oxidation and secondary settling tank), and disinfection. Further treatment is intended via biological ponds. Additionally, the scheme includes sludge and sand grounds. Horizontal sand traps operate at the Storozhynets Wastewater Treatment Plant with a circular flow direction of water, constructed according to a standard project. The water then enters primary settling tanks, circular reinforced concrete vessels with an internal diameter of 9 meters and a depth of 9.3 meters, serving for preliminary wastewater treatment before being directed to further treatment facilities. According to the technological scheme, effluents then enter aerating tanks. For aerobic biological treatment, we use a pressure aerator tank. Each section’s volume is approximately 1,200 cubic meters. The aeration system comprises polymer tubes installed on the tank bottoms. To avoid stagnant zones in the aerating tank and enhance the facility’s efficiency, AMD-type mixers are planned. Following biological treatment, the water is directed to active secondary vertical settling tanks. We plan to remove excess sludge using airlifts and send the surplus sludge to dewatering on sludge grounds with a SEG.40.09 pump. After the biological treatment of wastewater, the total bacterial content decreases by 98%. However, complete elimination (the remaining 2%) of bacteria is only achievable through disinfection using chemical substances, in this case, chlorine. The master’s thesis conducted a literature review on the application of microalgae in wastewater treatment technologies. Microalgae are promising biosystems capable of effectively removing nitrogen and phosphorus compounds from wastewater. Additionally, by enriching the aquatic environment with oxygen, these organisms accelerate oxidation processes and the mineralization of organic impurities present in wastewater. The thesis also presents local estimates for general construction works related to building construction. Study object is Sewage Treatment Facilities in the city of Storozhynets. Scope of research is reliable and efficient operation of wastewater treatment facilities in Storozhynets. Goal of research: to execute the reconstruction project of sewage treatment facilities at the communal enterprise "Storozhynetske ZKG" in Storozhynets. Calculate sand traps and determine the amount of sand collected on the grounds. Verify the efficiency of aerating tanks and propose a layout scheme for aerators. Conduct a literature review on the application of microalgae in wastewater treatment technologies. Briefly put research results: Reconstruction project of sewage treatment facilities at the communal enterprise "Storozhynetske ZKG" in Storozhynets. Designed sand traps with circular water flow. Designed an aerating tank with mechanical oxygen supply. Designed secondary settling tanks. Designed a disinfection station. Analyzed the potential of using microalgae in wastewater treatment technologies. Keywords: sewer system, sewage treatment facilities, sand trap, aerating tank, settling tank, disinfection, microalgae. References. 1. DBN V.2.5-75:2013. Kanalizatsiya. Zovnishni merezhi ta sporudy. Osnovni polozhennya proektuvannya. Kyyiv : Minrehionbud Ukrayiny, 2013. – 210 s 2. Koval?chuk V.A. Ochystka stichnykh vod: Navchal?nyy posibnyk. – Rivne: VAT „Rivnens?ka drukarnya”, 2003. – 662 s. 3. Vasylenko A.Y., Vasylenko A.A. Proektyrovanye kanalyzatsyy naselennykh mest. - K.: Budivel?nyk, 1985. – 136 s. 4. «Microalgae and wastewater treatment» /Abdel-Raouf, A.A.Al-Homaidan, I.B.M.Ibraheem/ Publication 2012. 5. Abdel-Raouf N., Al-Homaidan A.A., Ibraheem I.B.M. Microalgae and wastewater treatment. Saudi J. Biol. Sci. 2012. Vol. 19. P. 257—275. 6. Andersen R.A. The microalgal cell. Handbook of microalgal culture: applied phycology and biotechnology. Ed. by Richmond A., Hu Q. Oxford: Wiley. 2013. Р. 1—20. 7. Batch and continuous studies of chlorella vulgaris in photobioreactors/ Claudia Sacasa Castellanos/- The University of Western Ontario, Ontario, Canada. January 2013. 8. . Zolotar?ova O. K. Perspektyvy vykorystannya mikrovodorostey u biotekhnolohiyi : monohrafiya. K. : Al?terpres, 2008. 235 s.