The article presents results of analyses concerning the influence of air temperature on the sewage temperature in the household sewage treatment plant. Each of the objective treatment plants (4 of them) consisted of the septic tank and vertical flow sand filter. The research was carried out from March 2003 to May 2006. Air temperature, raw sewage temperature (flowing into the septic tank), primarily treated sewage (after the septic tank) and treated sewage (on the out-flow from the septic tank) temperature was measured. The influence of the sur-rounding temperature on the raw sewage, primarily treated sewage and treated sewage temperature was statistically analyzed. On the basis of the research it was ascertained, that the temperature of the raw, primarily treated and treated sewage is influenced by the air temperature. ...
The article presents the thorough description of the vertical flow sand filters. The construction of sand filters was also presented and materials used for building filters were described. In the next part, capacities of sewage treatment in the vertical flow sand filters were presented. Vertical flow sand filters are mainly used as the second step of sewage treatment after septic tanks or after Imhoff tanks, as well as the third step after biological treatment processes when the high quality and stable outflow is required. Sand filters are useful for treatment sew-age from single households and from the group of houses, but they also can be used in bigger sewage treatment plants for the public utility objects. The article ends with the summary and conclusions where it is ascertained that the vertical flow sand filters are very good solution regarding household sewage treatment plants, in the areas where the combined sewerage system can-not be applied. Moreover the efficiency of sewage treatment in these objects is high. ...
The work aimed at the assessment of working of a household sewage treat-ment plant based on a horizontal flow sand filter.Physicochemical analyses of chosen pollution indexes (BZT5, ChZTCr, total suspension, total phosphorus) were carried out and compared with currently in force values of these indexes according to the Regulation of the Minister of the Environment of 24th July 2006. On this basis the operation of the sewage treat-ment plant was assessed. Raw, initially treated and treated sewage samples were taken from December 2008 to March 2009. Physicochemical analysis was carried out in the Laboratory of the Department of Sanitary Engineering and Water Man-agement of the University of Agriculture in Kraków. The gathered results of tests and their analysis conducted in the paper showed the proper working of the household sewage treatment plant.
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