STUDY OF EFFECTIVENESS OF CHEMICAL TREATMENT OF SEWAGE SLUDGE
Abstract
The paper presents results of experimental studies on kinetics of deposition of surplus activated sludge, which constitutes the main part of sewage sludge produced in bulk at municipal biological water treatment stations. Samples of activated sludge have been deposited in the presence of chemical reagents aiming at coagulating and flocculating solid particles followed by their separation from the aqueous phase. With a focus on increasing separation efficiency, iron(II) and aluminum sulfates along with magnesium chloride have been applied as coagulants, and starch and praestol – as flocculants. It has been demonstrated that among the coagulants that contribute to the destruction of the hydrated shell of the surplus activated sludge, ferrous sulfate shows the best result, while the use of magnesium chloride is ineffective. The effective dose of ferrous sulfate required for coagulating the sediments has been determined. The data obtained can be used when considering ways for further processing, disposal and utilization of the sewage sludge.
References
Pinaev V.E., Chernyshev D.A. // Online magazine «Naukovedenie» [Science]. 2014. No. 4. https://naukovedenie.ru/PDF/04EVN414.pdf (accessed 31.03.2019) [in Russian].
Ksenofontov B.S. // Ecologiya i promishlennost’ Rossii [Ecology and industry of Russia]. 2018. V. 22. No. 9. P. 4 [in Russian]. DOI: 10.18412/1816-0395-2018-9-4-7.
Moran E., Plekhanov A.V., Lobanov F.I. // Vodosnabzhenie i sanitarnaya tekhnika [Watersupply and sanitary equipment]. 2017. No. 6. P. 47 [in Russian].
Sibieva L.M., Ezhkova D.V., Sirotkin A.S., Vdovina T.V. // Voda: khimiya i ecologiya [Water: chemistry and ecology]. 2017. No. 7 (109). P. 31 [in Russian].
Gaponenkov I.A., Fedorova O.A. // Vestnik MGTU [Bulletin of MSTU]. 2013. V. 16. No. 4. P. 681 [in Russian].
Sizykh M.R. // Vestnik Buryatskogo gosudarstvennogo universiteta [Bulletin of the Buryat State University]. 2013. No. 3. С. 17 [in Russian].
Verbovskiy O.V. PhD Thesis (Engineering). Rovno: Ukr. State Acad. Water Management, 1996 [in Ukrainian].
Strekalova D.O., Savelova E.A. // Alleya Nauki [Alley of Science]. 2018. V. 2. No. 3 (19). P. 385 [in Russian].
FR 1.31.2008.04397. Methods for measuring mass concentration of active sludge. Moscow: Akvaros, 2008 [in Russian].
Dremicheva E.S., Gavrilov A.S. // Him. Bezop. [Chemical Safety Science]. 2018. V. 2. No. 2. P. 286 [in Russian]. DOI: 10.25514/CHS.2018.2.14122.
Copyright (c) 2019 E. S. Dremicheva, and A. S. Gavrilov
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