The effect of wastewater retention time in a Phoredox system on microfauna composition in activated sludge

• Autorzy: Hul M
• Języki publikacji: EN

Abstrakty

EN

Laboratory experiments were carried out in 4 series differing as to waste- water retention time in anaerobic (t1), anoxic (t2), and aerobic (t3) chambers, and in a whole Phoredox system (t). Conditions for satisfactory development of the microfauna communities were ensured by the proportion t1: t2: t3 = 1.8 : 2.8 : 6.0 (h). This proportion was also characterised by the highest reduction of organic substances and nutrients. When t3 increased to 10.7 h, starvation symptoms appeared, whereas an increase of t1 to 4 h resulted in an oxygen deficiency in the microbiocoenosis. Reduction of t from 11.8 to 6.3 h increased the rate of microfauna washing out from the system.

PL

Przeprowadzono 4 serie badań laboratoryjnych różniące się czasem zatrzymania ścieków w komorze beztlenowej (t1), anoksycznej (t2) i tlenowej (t3) oraz w całym układzie Phoredox (t). Prawidłowy rozwój zbiorowisk mikrofauny stwierdzono przy proporcji t1 : t2 : t3 = 1.8 : 2.8 : 6.0 (h). Przy tej proporcji osiągnięto również największy ubytek związków organicznych i biogennych. Po powiększeniu t3 do 10.7 h wystąpiły objawy głodowania, a po powiększeniu t1 do 4 h - objawy niedotlenienia mikrobiocenozy. Skrócenie t z 11.8 do 6.3 h powodowało zwiększone wymywanie mikrofauny z systemu.

Słowa kluczowe

EN

waste water retention; environment protection; microfauna; activated sludge; retention time; Phoredox system; composition

• Wydawca: -
• Czasopismo: Acta Hydrobiologica
• Rocznik: 1996
• Tom: 38
• Numer: 1-2
• Opis fizyczny: p.45-52,fig.

Twórcy

autor

Hul M

• Academy of Agriculture and Technology, Oczapowskiego 5, 10-957 Olsztyn, Poland

Bibliografia

• Čech J.S., Hartmann P. and Macek M. 1994. Bacteria and protozoa population dynamics in biological phosphate removal systems. Wat. Sci. Tech., 29, 109-117.
• Curds C.R. 1982. The ecology and role of Protozoa in aerobic sewage treatment processes. Ann. Rev. Microbiol., 36, 27-46.
• Curds C.R., Cockburn A. and Vandyke J.M. 1968. An experimental study of the role of the ciliated protozoa in the activated sludge process. Wat. Poll. Contr., 67, 312-329.
• Czerska B., Miksch K. and Surmacz-Górska J. 1994. Usuwanie związków fosforu w procesie biologicznego oczyszczania ścieków [Phosphate removal in the biological treatment process]. Biotechnologia, 2, 32-39 [in Polish].
• Esteban G., Tellez C. and Bautista L.M. 1991. Dynamics of ciliated protozoa communities in activated-sludge process. Wat. Res., 25, 967-972.
• Grabińska-Łoniewska A. 1991. Denitrification unit biocoenosis. Wat. Res., 25, 1565-1573.
• Inamori Y., Kuniyasu Y., Sudo R. and Koga M. 1991. Control of the growth of filamentous microorganisms using predacious ciliated protozoa. Wat. Sci. Tech., 23, 963-971.
• Klimiuk E. 1996. The influence of the environmental conditions on nutrient removal mechanisms through activated sludge system. Acta Acad. Agricult. Tech. Olst., Protectio Aquarum et Piscatoria, 21, 5-19 [In Polish with English abstract].
• Klimiuk E., Wojnowska-Baryła I. and Kuczajowska-Zadrożna M. 1996a. Rate analyses of organic contamination removal, nitrification and denitrification in the Phoredox system. Acta Acad. Agricult. Tech. Olst., Protectio Aquarum et Piscatoria, 21, 21-40 [in Polish with English abstract].
• Klimiuk E., Wojnowska-Baryła I. and Kuczajowska-Zadrożna M. 1996b. The influence of hydraulic retention time on the effectiveness of phosphate compound removal in the Phoredox system. Acta Acad. Agricult. Tech. Olst., Protectio Aquarum et Piscatoria, 21, 55-70 [in Polish with English abstract].
• Macek M. 1989. Experimental approach to the role of different ecological types of Protozoa in activated-sludge system. Int. Rev. Gesamten Hydrobiol., 74, 643-656.
• Madoni P. 1991. Role of protozoans and their indicator value in the activated sludge process. In: Madoni P. (ed) Biological approach to sewage treatment process: Current status and perspectives. Perugia, Centro Bazzucchi, 21-27.
• Madoni P., Davoli D. and Chierici E. 1993. Comparative analysis of the activated sludge microfauna in several sewage treatment works. Wat. Res., 27, 1485-1491.
• Poole J.E.P. 1984. A study of the relationship between the mixed liquor fauna and plant performance for a variety of activated sludge sewage treatment works. Wat. Res., 18, 281-287.
• Salvado H. 1994. Effect of mean cellular retention time on ciliated protozoan populations in urban wastewater treatment plants based on a proposed model. Wat. Res., 28, 1315-1321.
• Salvado H. and Gracia M.P. 1993. Determination of organic loading rate of activated sludge plants based on protozoan analysis. Wat. Res., 27, 891-895.
• Sladka A. and Sladeček V. 1985. A guide of organisms from waste water plants. Prace a studie, Vyz. Ustav Vodohosp. (Praha), 162, 156 pp.
• Stout J.D. 1956. Reaction of ciliates to environmental factors. Ecology, 37, 178-191.
• Wanner J., Chudoba J., Kucman K. and Proske L. 1987. Control of activated sludge filamentous bulking. 7. Effect of anoxic conditions. Wat, Res., 21, 1447-1451.