The article presents results of research carried out on four “DUOFILTER” type septic tanks. Analysed objects made first step of living sewage treatment in household sewage treatment plants. As a second step of treatment vertical flow sand filter was applied. Sewage flow through the tank in each case was less than 1,0 m3*d-1. Septic tank consisted of three chambers: first – sedimental one and two flow ones, equipped with filter made of porous structures. The research was carried out during the period from October 2003 to May 2005. Concentrations of raw sewage pollutants were analysed – taken from the first chamber of the tank, and sewage primarily treated – taken on the outflow from the tank. Three indexes from the basic group: BOD5, CODCr, total suspended solids were physicochemically analysed. On the basis of the carried out results’ analysis, mean effectiveness of BOD5 was ascertained from 25,3 to 40,2%; CODCr from 32,4 to 43,5 %; total suspended solids from 35,9 to 56%. ...
Proper wastewater management in rural areas is a difficult issue, especially that we can still see a disparity between the level of water service coverage and canalization of municipalities. The length of sewerage network increases every year, which indicates that municipalities are taking actions to improve sanitary condition. According to the National Program for Municipal Wastewater [Krajowy Program Oczyszczania Ścieków Komunalnych 2010], if the construction of sewage system is not justified, the municipality should solve the problem of waste disposal on their own. The paper presents the basic object at household sewage treatment plant - the septic tank. The septic tank is responsible primarily for the mechanical treatment of wastewater from the solids and for the initial stabilization (anaerobic) sediments. The authors paid attention to the quality of wastewater supplied to the tanks as well as wastewater delivered to the next steps of purification. The article, except study of literature includes results of several year of observations concerning parameters of wastewater after mechanical purification. According to the literature, the effectiveness of the operation is at the level of 40-94% for the suspension, 23,3-66,0% for BOD5. The lowest reduction was observed for compounds of nitrogen and phosphorus. ...
