The aim of the research was defining temperature changes of sewage in sewerage system and in open biological reactor under the influence of atmospheric air temperature. The literature connected with sewage treatment doesn’t give unequivocal information regarding influence of air temperature on sewage temperature in the canalisation. Some authors claim that such a relationship doesn’t occur. The research carried out on the area of sewage treatment plant in Koszyce commune showed, that important relationship exists between mean daily atmospheric air temperature (tair) and mean daily temperature of sewage in sewerage system (tsew). This relationship may be with high accuracy (R2=0,78, p<0,001)described by a cubic polynomial equation: tsew = -0,0011·(tair)3 + 0,0232·(tair)2 + 0,3704·tair + 9,0554. In the research period, mean daily temperature of sewage in sewerage system was going under big fluctuations, from 6,35 to 17,56°C. Changes of sewage temperature in the collector during the day ranged between 0,35°C and 4,60°C. In the winter period, with mean daily air temperature under 5°C, sewage temperature in the canalisation lowered under 10°C, reaching its minimal value of 5,37°C. In biological reactor, which was built as a reinforced concrete open reservoir, mean daily sewage temperature ranged between 5,68 and 21,04°C. Whereas in the ...
In paper a groundwater quality on sewerage and non-sewerage areas in chosen community was presented. Ten control points were localised in nonseweraged villages and two in seweraged one. Analyses were carried on in summer 2007. The colour, turbidity, reaction, conductivity, nitrite nitrogen, nitrate nitrogen, ammonia nitrogen, manganese, iron and amount of bacteria coli were analysed in each sample. Obtained results were put through statistical analyses in which an essential differences of groundwater pollution index values to be tested between seweraged and non-seweraged areas. ...
The aim of the research was to evaluate the pollutants' concentration in the household sewage drained from the rural or rural-urban districts located in Lesser Poland Voivodeship. The research was based on the analysis of 140 raw sewage samples taken from 34 sewerage systems in the period of 2000-2009. Val-ues of five selected pollution indexes were analyzed: BOD5, COD, total suspended solids, general nitrogen and general phosphorus. The results were compared to the amounts presented in the common literature on the sewage treatment. The research showed that the average values of the pollution indexes in the household sewage drained from the rural and urban-rural districts in Lesser Po-land Voivodeship differ from the values presented in the literature. The biggest difference was found in the case of the general nitrogen (value 48% higher) and COD (value 4,4% higher). However the average concentration of the general phosphorus, 11 mgP•dm-3, turned out to be 45,8% lower than the average value presented in the literature. The maximum values of BOD5, COD, total suspended solids and general nitrogen in the tested sewage were much higher than the maxi-mum values in the analyzed references. On the basis of the relationships between the average values ...
The aim of this study was to determine the extent of the effect of infiltration into a sewerage system during wet weather on the concentration of nitrogen and phosphorus compounds in raw sewage flowing into the treatment plant and in treated sewage discharged into the receiver. The study was conducted in four se-lected sewerage systems located in the Lesser Poland Voivodeship. The results showed that in each of the analyzed cases the concentration of to-tal nitrogen and total phosphorus in raw sewage was reduced by the infiltration into the sewerage system during wet weather. There was no adverse effect of infiltration on the concentration of total ni-trogen in treated sewage discharged into the receiver during wet weather. On the other hand, the research showed that when the share of infiltration in the daily flow increased by 10%, the concentration of total nitrogen was reduced by from 2.7 to 4.8%. The research demonstrated the adverse effect of infiltration on the concen-tration of total phosphorus in treated sewage in the case of objects with low hy-draulic capacity. Sewage flows, increased by infiltration water, caused the removal of activated sludge, containing phosphorus compounds, from bioreactor chambers and funnels of secondary settling tanks. However, ...
