The work contains the evaluation of work of the small rural sewage treatment plant servicing citizens of the Michniów village (Suchedniów community, Świętokrzyskie Province). The basic element of process line is the activated sludge reactor of sequential work, so called SBR. The bases for evaluation elaboration were data allowed by a user of the object. There were: results of treated sewage volume and results of BOD5, COD5 and total suspension in not treated and treated wastes determinations, coming from years: 2004-2005. In the regarded two-years period hydraulic charge amounted meanly: in the first year about 75%, in the next year about 89% of designed output, that is 35 m3·d-1. In the same period in raw sewage average content of BOD5 (577,8 mgO2⋅dm-3) and total suspension (488,8 mg⋅dm-3) were 1,5 times higher, and CODCr content (1124,9 mgO2⋅dm-3) even 2 times higher than the ones taken in the object design stage. This conjuncture, in situation when sewage treatment plant rejected sewage which were bringing by waste removal tankers could be a proof of illegal pumping contents of house cesspools into sewers sanitary, in case of this properties, which are not connect with yet. In these exploitation conditions the waste purification effects in ...
The article presents results of analysis and their discussion concerning operation of sewage from butchery of pigs pretreatment plant in Gruszów in Pałecznica commune. Additionally, construction of the mentioned pretreatment plant was discussed, for authors of its idea and project are Ph.D. eng. Marian Długosz and Ph.D. eng. Piotr Bugajski. The aim was to solve three problems: to regulate high disproportion of outflowing sewage, to reduce amount of pollutants contained in sewage and to prevent them from rotting. The research included regulation of sewage outflow put evenly in time, physicochemical analysis (BOD5 and COD) of sewage before and after pretreatment plant and measurements of oxygen amount in outflowing sewage. The first object on the technological way is well with the sieve for solid parts, in which pollutants bigger than 5,0 mm are stopped. Next, sewage flows into the settling tank, in which inflammable pollutants sediment to the bottom, and afterwards sewage flows to the aeration chamber. In this chamber, process of sewage aeration (oxygenation) occurs. Oxygenated sewage flow into the grease trap, and next into the well, in which sewage separation occurs. Part of them goes into the living sewerage system, and next to the Bioblok PS-50 sewage treatment plant, ...
The performed study aimed to determine the effect of sewage temperature in bioreactors on pollution discharges measured by the BOD5, COD and total ni-trogen indexes. The research was carried out in a municipal sequential batch re-actor (SBR) treatment plant. The discussed treatment plant is located in Książ Wielki commune in Miechów district in Lesser Poland voivodeship. Households from two villages: Książ Wielki and Wielka Wieś discharge their sewage into the analysed treatment plant. An average of 100 to 110 m3•d-1 of sewage constituting nearly 50% of the designed hydraulic load of this object was discharged into the treatment plant during the study period. Temperature measurements and sewage sampling for physicochemical analyses were performed for 24 months in 2007 and 2008. Twenty four sewage samples were collected with a frequency of once per month. The lowest sewage temperature in the bioreactor during the study period was 7.1°C, whereas the highest temperature reached 18.8°C. Therefore, the sew-age temperature amplitude in the bioreactor was 11.7°C. Low sewage temperature below 10°C occurred from December to April. Lower efficiency of neutralisation of the 3 analysed pollution indexes was observed in this period. The carried out research revealed average relationship between the sewage temperature in the ...
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, ...
The efficiency of sewage treatment in the ground bed under the subsurface sewage disposal field was tested in laboratory conditions using synthetic sewage. The ground bed was composed of mean sand and mean sand with assist layer with chalcedonite. The experiment determined the following indicators: suspended solids, BOD5, COD, total nitrogen, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, total phosphorus and pH. In the sewage filtered through the ground bed of mean sand as well as through mean sand with assist layer with chalcedonite, increase in the values of nitrite nitrogen and pH was observed. The values other indicators of the treated sewage, was undergo a decrease. The suspended solids, BOD5, COD, total nitro-gen, total phosphorus of the treated sewage, are meeting obligatory standards. The ground bed with mean sand with assist layer with chalcedonite is characterized by a better effectiveness of sewage treatment. ...
