REDUCING THE LEVEL OF TECHNOGENIC HAZARDS IN THE DISPOSAL OF URBAN SEWAGE SLUDGE
National University of Civil Defence of Ukraine, Kharkiv, Ukraine
Keywords: technogenic safety, sewage, sludge pits, humic substances, peat, heavy metals, ultrasound
The article deals with the issue of reducing the level of man-made danger of the negative impact of urban sewage sludge on the environment by removing heavy metals with the help of humic substances.
It is noted that urban sewage sludge contains more than 90% of organic substances that can serve as organic fertilizer for agriculture. However, these sediments are practically not used as fertilizers due to the lack of approved technical and sanitary-hygienic requirements for them.
At the same time, it was established that the composition of urban wastewater generated at the city's sewage treatment plants contains heavy metals, which must be removed from wastewater sediments in order to use them as fertilizers in agriculture.
A new method of removing heavy metals from urban sewage sludge using humic reagents with simultaneous ultrasound treatment is proposed.
Effective modes of simultaneous mixing of humins and their ultrasonic treatment have been selected, as a result of which the efficiency of heavy metals, namely iron, copper and aluminum, is improved.
1. Nimmi, G. Treatment of Sewage and Sewage Sludge. Waste Management. https://www.environmentalpollution.in/water-pollution/treatment-of-sewage-and-sewage-sludge-waste-management/6495 (access date: 01.05.2022).
2. Reddy, K. G., Yarrakula, K., & Lakshmi, V. U. (2019). Reducing Agents Enhanced Electrokinetic Soil Remediation (EKSR) for Heavy Metal Contaminated Soil. Iranian Journal of Chemistry and Chemical Engineering, 38(3), 183–199.
3. Cieślik, B. M., Świerczek, L., & Konieczka, P. (2018). Analytical and legislative challenges of sewage sludge processing and management. Monatshefte für Chemie, 149, 1635–1645. DOI: 10.1007/s00706-018-2255-2.
4. Hudcová, H., Vymazal, J., & Rozkošný, M. (2019). Present restrictions of sewage sludge application in agriculture within the European Union. Soil and Water Research, 14, 104–120.
5. Yeşil, H., Molaey, R., Çalli, B., & Tuğtaş, A. E. (2021). Removal and recovery of heavy metals from sewage sludge via three-stage integrated process. Chemosphere, 280, 130650. DOI: 10.1016/j.chemosphere.2021.130650.
6. Kobierski, M., Kondratowicz-Maciejewska, K., Banach-Szott, M., Wojewódzki, P., & Castejón, J. M. P. (2018). Humic substances and aggregate stability in rhizospheric and non-rhizospheric soil. Journal of Soils and Sediments, 18, 2777–2789. DOI: 10.1007/s11368-018-1935-1.
7. Matsak, A., Tsytlishvili, K., Rybalova, O., Artemiev, S., Romin, A., Chynchyk, O. (2018). Method of agricultural sewage water purification at troughs and biosorption bioreactor. Eastern-European Journal of Enterprise Technologies, 5, 10, 15ؘ–24.
8. Dushkin, S. (2021). Znyzhennja rivnja tehnogennoi' nebezpeky negatyvnogo vplyvu osadu mis''kyh stichnyh vod na navkolyshnje seredovyshhe za dopomogoju guminovyh rechovyn [Reduction of the level of technogenic hazard negative effect of sediments of urban waste water on the environment with humic substances]. Technogenic and ecological safety, 10(2/2021), 70–74. DOI: 10.52363/2522-1892.2021.2.11. [in Ukrainian].
9. Shevchenko, T., Galkina, O., Martynov, S., & Dushkin, S. (2023). Removal of Heavy Metals from Sewage Sludge by Using Humic Substances. Lecture Notes in Networks and Systems, 536, 349–359. DOI: 10.1007/978-3-031-20141-7_32.