MICROWAVE DEWATERING AND DETOXIFICATION OF SEWAGE SLUDGE

UDC 628.15

  • Ignatenko Arkadiy Vasil’yevich – PhD (Biology), Associate Professor, Assistant Professor, the Department of Biotechnology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: ignatenko_av@tut.by

DOI: https://doi.org/10.52065/2520-2669-2021-247-2-115-120

Key words: sewage, sludge, sedimentation, dewatering, coagulant-flocculants, centrifugation, aquatic extracts, biotesting, toxicity, detoxification.

For citation: Ignatenko A. V. Microwave dewatering and detoxification of sewage sludge. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2021, no. 2 (247), pp. 115– 120 (In Russian).DOI: https://doi.org/10.52065/2520-2669-2021-247-2-115-120.

Abstract

The paper considers the advantages and disadvantages of the methods used for dewatering sewage sludge from urban wastewater treatment plants, and the possibility of eliminating them by using microwave treatment of precipitats. The aim of the work is to analyze the reagent-free microwave method of sewage sludge treatment. The kinetics of changes in the humidity and temperature of sewage sludge wastewater precipitats depending on the power, time of microwave treatment and the initial humidity of sewage sludge is studied. It is shown that the microwave effect on the sewage sludge of wastewater is complex and can simultaneously and quickly reduce the level of their humidity from 99 to 75%, provide pasteurization temperature 60–80°C and carry out detoxification of sewage sludge and decrease their index of toxicity in 3–4 times. The application of microwave treatment of sewage sludge makes it possible to abandon the use of centrifugation and coagulant flocculants in the dewatering of sediments and to increase the safety of sewage sludge for environment and for practical use as fertilizers.

Download

References

  1. Voitov I. V., Martsul’ V. N. Problems and main directions of improving the treatment of sediments of sewage treatment plants in the Republic of Belarus. Materialy Mezhdunarodnoy konferentsii, posvyashchennoy 145-letiyu UP “Minskvodokanal” “Sovremennyye tendentsii v razvitii vodosnabzheniya i vodootvedeniya” [Materials of the International Conference dedicated to the 145th anniversary of UE “Minskvodokanal” “Modern trends in the development of water supply and sanitation”: in 2 parts]. Minsk, 2019, part 2, pр. 137–140 (In Russian).
  2. Novikova O. K. Treatment of sewage sludge. Gomel’, BelGUT Publ., 2015. 96 p.
  3. Myagchenkov V. A., Baran A. A., Bekturov E. A., Bulidorova G. V. Poliakrilamidnyye flokulyanty [Polyacrylamide flocculants]. Kazan, KGTU Publ., 1998. 288 p.
  4. Rogov I. A., Nekrutman S. V. Sverchvysokochastotnyy nagrev pishchevykh produktov [Ultra-highfrequency heating of food products]. Moscow, Agroprom Publ., 1986. 351 p.
  5. Gareev F. Kh. Problems and prospects of microwave drying of wood. LesPromInform [LesPromInform], 2004, no. 1, pp. 50–52 (In Russian).
  6. Ispol’zovaniye electromagnitnogo izlucheniya sverkhvysokoy chastoty dlya оbezzarazhivaniya infitsirovannykh meditsynskikh оtkhodov: metodicheskiye rekomendatsii [The use of electromagnetic radiation of ultra-high frequency for disinfection of infected medical waste: methodological recommendations]. Moscow, Federal Center for Hygiene and Epidemiology of Rospotrebnadzor Publ., 2006. 12 p.
  7. Klimarev S. I., Ilyin V. K., Smirenny A. L. Microwave Sterilizer of Potable Water in Stream. The 28th International Conference on Environmental Systems. SAE Technical Paper Series, Denvers, Massachusetts, USA, 1998, pp. 1–6.
  8. Klimarev S. I. Prospects of using the ultrahigh frequency electromagnetic field for the intensification of technological processes in the development of physico-chemical life support systems of a new generation. Materialy Vserossiyskoy konferentsii “Problemy obitaemosti v germoob”yektakh [Materials of the All-Russian Conference “Problems of habitability in hermetic objects”]. Moscow, 2001, pp. 87–89 (In Russian). Gaponenkov I. A., Fedorova O. A. Microwave treatment of sewage sludge from food production. Vestnik MGTU [Bulletin of the MSTU], 2013, vol. 16, no. 4, pp. 681–686 (In Russian).
  9. Ignatenko A. V. Sample preparation and bioassay of the toxicity of sludge wastewater. Khimicheskaya bezopasnost’ [Chemical safety], 2018, vol. 2, no. 2, pp. 251–271 (In Russian).
  10. Karmanov A. P., Polina I. N. Tekhnologiya ochistki stochnykh vod [Technology of wastewater treatment]. Syktyvkar, SLI Publ., 2015. 208 p.
  11. Chen Z., Afzal M. T., Salema A. A. Microwave drying of wastewater sludge. J. Clean Energy Technology, 2014, vol. 2, no. 2, pp. 282–286.
  12. Ignatenko A. V. Reagent-free disinfection and biosafety control of sewage sludge. Trudy BGTU [Proceedings of BGTU], 2017, no. 1: Chemical Engineering, Biotechnologies, Geoecology, pp. 102–105 (In Russian).
  13. Simeng Li, Runwei Li, Youneng Tang, Gang Chen. Microwave-induced heavy metal removal from dewatered biosolids for cost-effective composting. J. of Cleaner Production, 2019, 241: 118342.
29.04.2021