Hidrológiai Közlöny 1989 (69. évfolyam)

4. szám - Andrik Péter: A Giardia lamblia terjedése ivóvíz útján. Irodalmi áttekintés: IV. rész. A kórokozó eltávolítása vízkezelési eljárásokkal

ANDRIK P.: Giardia lamblia 239 DeWalle, F. B., Engeset, J., Lawrence, W., 1984. Removal of Giardia lamblia cyists by drinking water treatment plants. US EPA—

600/2—84—069. US EPA, Cincinnati, Oh. Geldreich, E. E., 1981. Current status of microbiological water quality criteria. ASM News, 47. 23—27. Geldreich, E. E., 1986. Potable water: new directions in microbial regulations. ASM News, 52. 530—534. Hendricks, D. W., Bellamy, W. D., Al-Any, M. Y., 1984. Removal of Giardia cysts by filtration. In: Pirbazari, M., Devinny, J. S. (eds.) Proc. Environmental Engineering Speciality Conference, June 25 —27., Los Angeles, 1984. Amer. Soc. Civil Engineers, New York, pp. 245—251. Kirner, J. C., Litter, J. D., Angelo, L. A., 1978. A waterborne outbreak of giardiasis at Camas, Wash. Jour. Amer. Water Works Assoc. 70. 35—40. Kollár Gy., öllős G., 1975. A kovaföld szűrő. Hidrol. Közi, 55. 379—382. Lángé, K. P., Bellamy, W. D., Hendricks, D. W., Logsdon, G. S., 1986. Diatomaceus earth filtration of Giardia cysts and other substances. Jour. Amer. Water Works Assoc. 78. 76—84. Lippy, E. C., 1978. Tracing a giardiasis outbreak at Berlin, N. H. Jour. Amer. Water Works Assoc. 70. 512—520. Lippy, E. C., Logsdon, G. S., 1984. Where does waterborne giardiasis occur and why? In: Pirbazari, M., Devinny, J. S. (eds.) Proc. Environmental Engineering Speciality Conference, June 25—27., Los Angeles, 1984. Amer. Soc. Civil Engineers, New York, pp. 222 —228. Logsdon, G. S., 1987. Comparison of some filtration processes appropriate for Giardia cyst removal. Giardia Conference, Calgary, Alberta, Canada, Febr. 23—25., 1987. US EPA, Cincinnati, Oh. (kézirat). Logsdon, G. S., Symons, J. M., Hoye, R. L. Jr., Arozarena, M. M., 1981. Alternative filtration methods for removal of Giardia cysts and cyst models. Jour. Amer. Water Works Assoc. 73. 111—118. Logsdon, G. S., Hendricks, D. W., Pyper, G. R., Hibler, C. P., Sjogren, R., 1983. Control of Giardia cysts by filtration: the laboratory's role. Proc. of Water Quality Technology Conf. XI., AWWA, Dec. 1983. Logsdon, G. S., Thurman, V. C., Frindt, E. S., Stoecker, J. G., 1985. Evaluating sedimentation and various filter media for removal of Giardia cysts. Jour. Amer. Water Works Assoc. 77. 61—66. Primary Drinking Water Regulations (PDWR), Section 17.1.2. Colorado Board of Health, Denver, Colo. (Dec. 1977). Pyper, G. R., 1985. Slow sand filter and package treatment plant evaluation: operating costa and removal of bacteria. Giardia, and trihalomethanes. US EPA 600/2—85/052. US EPA, Cincinnati, Oh. Thompson, J. C., 1986. Summary of revisions of the drinking water regulations and amendments of the Safe Drinking Water Act. Camp Dresser and McKee Inc., Boston. Kézirat beérkezett: 1988. július 15. Átdolgozás beérkezett: 1988. szeptember 22. Közlésre elfogadva: 1988. december 26. (Folytatása következik) Domestic water as a vector of Giardia lamblia, Review of literature. Part IV. Removal rates by water treatment Andrik, P. Abstract: Keywords: In part IV of the review of the literature on the pathogenetic Giardia lamblia the removal possibilities of the monocell from water are considered. Of the conventional water treatment methods rapid filtration coupled with proper chemical pretreatment will remove the Giardia cysts at good efficiencies in the direct and „in-line" versions alike. Retention rates of the cysts are hardly influenced by changes in the rate of filtration (Fig. 1). In the course of sedimentation and filtration a close correlation is observable between the decrease in turbidity and cyst counts (Fig. 2). Rapid filtration and the preceding sequence of operations are rather vulnerable. A number of operational defects may cause sudden deterioration in filtration efficiency and the cysts finding access to the portable water present an epidemy hazard (Fig. 3). This method of filtration presumes, therefore, the strict observation of operational discipline and a high level of professional skill. The cysts are removed at a very high efficiency by slow filtration, which is however, limited in its application by the quality of the raw water. For good filtration efficiency the filters must have a well established bacterial population. Diatomaceous filters are considered eminently suited for removing the monocell cysts. Their efficiency is claimed to depend on the thickness of the biological layer, but not on the quality and granulometry of the diatomaceous earth, nor on water temperature, filtration rate, cyst concentration in the raw water (Fig. 4). The high power demand is considered a drawback. Since water treatment methods alone are ineffective in retaining the bacteria, while the cysts survive disinfection, tht „double barrier" principle must be observed when treating surface water to drinking quality, in that the cysts must be retained by filtration, while the bacteria must be destroyed by disinfection. The potential occurrences of Giardia lamblia in Hungarian waters will be considered in the next (concluding) part of the paper. Giardia lamblia, water treatment, filtration methods 1967-ben végezte el a Kossuth Lajos Tudományegyetem kémia—biológia szakát. Másfél éves vízműves technológiai gyakorlat után, 1969-től dolgozik a Borsod Megyei Köjálban, mint a vízbakteriológiai laboratórium vezetője. 1973-ban doktorált a lázbérci víztározó mikrobiológiai vizsgálatainak témaköréből. 1976-ban a BME-n mérnök-biológus szakmérnöki oklevelet szerzett. 1978—80 között Algériában dolgozott. 1971-től kezdődően, számos publikációja jelent meg hazai és külföldi vízügyi és egészségügyi szaklapokban, önálló szerkesztésű összeállítása a Vizdoknál. Szakterülete a higiénés vízmikrobiológia, különös tekintettel a vízfertőtlenítés bakteriológiai kérdéseire. Hidrológiai és közegészségügyi fórumok gyakori előadója. ANDRIK PÉTER