Vízügyi Közlemények, 1980 (62. évfolyam)

3. füzet - Petkó Gyula-Solti Dezső: Használt vizek újrahasznosítása, a ráiszapolt szűrők

436 Petkó Gy.—Solti D. IRODALOM Ollós Géza: A harmadik szennyvíztisztítási fokozat, Vízügyi Közlemények, 1971/4. Kollár F.—Ollós G.: A kovaföld szűrő. Hidrológiai Közlöny, 1975/8. Juhász József: Niagara szűrők kísérlete. VITUKI témabeszámoló, 1975. (Kézirat). Bulkai L.—Juhász J. : Üzemi kísérleti tapasztalatok ráiszapoló szűrőkkel. Hidrológiai Közlöny, Csanádi Mihály: Szakvélemény a pécsi tisztított városi szennyvíz ipari vízként való felhasználása ügyében végzett vizsgálatokról. (Kézirat) 1978. * * * Reuse oí wastewaters I'reeoat filters by Gy. Petko and D. Solti The long-term policy of water management has been compiled to meet the rapidly growing freshwater demand. To establish the balance between the available supplies and the consumer demands, a set of administrative-, legal-, economicand engineering measures must be implemented. These include the reuse of wastewaters after the necessary treatment. In Hungary the primary domains of such reuse are agriculture and industrial water supply. Advanced treatment in the interest of wastewater reuse is commonly referred to as tertiary treatment. The first unit operation thereof consists usually of filtration. In view of the potential expansion of effluent reuse and recycling this appears to present the relatively simplest and least expensive solution. Following a review of the concepts and methods of measurement associated with filtration, a detailed description is given of the precoat filter operating at the Pécs Municipal Sewage Treatment Plant. The secondary effluent treated to a high degree of removal efficiency is passed through a settling tank, prechlorinated and conveyed subsequently to the filter. Initially diatomaceous earth, presently perlite of P —

2 quality is used as filter coating. The filter effluent is chlorinated and fed into the industrial distribution network situated on the southern side of the town. Pumping against an elevated service basin the pumps deliver the treated effluent to meet the inferior-quality water of several industrial plants at Pécs. The suspended concentration in the secondary effluent is less than 20 mg/lit and is reduced to below 4 mg/lit by filtration using perlite at the rate of 0.5 kg per cu.m of filtrate without recovery. The trial operation of one year duration was carefully supervised by the competent public health officials. From the parasitological viewpoint the quality was found to be perfect. Model tests have demonstrated that wireworm eggs are removed dependably by filtration. The system has operated reliably since January 1, 1979. The unit price of construction and operation is lower than the corresponding figures for industrial water obtained from surface supplies. * * * l] 2 3 4 '5 Réutilisation des eaux usées Petkó, Gyula el Solti, Dezső Selon les plans à long terme de l'économie de l'eau, la demande en eau fraîche ne cesse de croître dynamiquement. La mise en équilibre des réserves d'eau disponibles et des demandes des consommateurs d'eau nécessite toute une série de mesures administratives, juridiques, économiques et techniques, dont la réutilisation après traitement des eaux usées, ce qui est très important en Hongrie, en premier lieu dans le domaine de l'alimentation en eau industrielle, en dehors de l'agriculture. Le traitement ultérieur en vue de réutiliser les eaux usées s'appelle épuration tertiaire. Le coup initial de l'épuration tertiaire est le filtrage. En considérant les possi-