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Analysis of sewage susceptibility to biodegradation on an example of sewage treatment plant in Wodzisław Śląski

Chmielowski K., Wąsik E., Operacz A., Bugajski P., Kaczor G., Jurik L.

Infrastruktura i Ekologia Terenów Wiejskich

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2017

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nr IV/1

1427--1443

EN

The paper presents an analysis of sewage susceptibility to biodegradation on an example of sewage treatment plant in Wodzisław Śląski in the Śląskie province. For this purpose, dependencies between selected indices of domestic sewage pollution were applied. Descriptive statistics of the respective indices rations COD/BOD5 , BOD5 /TN, BOD5 /TPwere presented. Moreover, an analysis was conducted on the composition of raw sewage flowing into the treatment plant, pre-treated sewage and sewage leaving the studied treatment plant. The analysis was carried out on the basis of three basic indices of sewage pollution (BOD5 , COD and total suspended solids) and two biogenic indices (total nitrogen and total phosphorus). Tests on the sewage composition were conducted in the years 2010-2015. Basic descriptive statistics were compiled for the values of the studied indices of sewage pollution and the obtained results were interpreted. On the basis of collected material it may be said that sewage reaching the treatment plant in Wodzisław Śląski revealed a good susceptibility to biodegradation, whereas the BOD5 /TN and BOD5 /TP ratios were below the optimum value.

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Compositional analysis of the sewage incoming to and discharged from the sewage treatment plant in Kolbuszowa Dolna

Chmielowski K., Bugajski P., Kaczor G.

Journal of Ecological Engineering

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2016

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Vol. 17, nr 5

9--16

EN

The paper presents the compositional analysis of sewage supplied to and discharged from the wastewater treatment plant in Kolbuszowa Dolna in the Subcarpathian region. The analysis was based on three basic indicators of sewage pollution (BOD5, CODCr, total suspended solids) and two biogenic indicators (total nitrogen and total phosphorus). The composition of sewage was studied in the years 2010–2015. Basic descriptive statistics for the values of the analyzed indicators of sewage pollution were summarized and the obtained results were interpreted. The study showed that the sewage was susceptible to biological treatment. Descriptive statistics for the relationship between the following indicators were presented: CODCr/BOD5, BOD5/Ntot, BOD5/Ptot. The collected results indicate high variability of the composition of sewage entering the studied facility. The coefficients of variation for the values of basic indicators (BOD5, CODCr, total suspended solids) in the raw sewage were similar and amounted to Wn = 0.45 while for total nitrogen it was Wn = 0.33 and for total phosphorus Wn = 0.40. The analysis of the collected material showed that sewage entering the treatment plant was readily biodegradable. On the other hand, the treated sewage was characterized by low values of the analyzed indicators, much below the permissible values provided by the water permit. The raw sewage was divided into five groups depending on the concentration of each pollution indicator. The number of raw sewage samples was determined for each group of the analyzed pollution indicator concentrations.

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Modelling of pollutants biodegradation in gravity sewer system

Łagód G., Sobczuk H., Suchorab Z.

Ecological Chemistry and Engineering. A

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2008

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Vol. 15, nr 11

1283-1291

EN

Since same time the gravity sewer system is seen as biochemical reactor as well as mean for collection and transport of wastewater. This point of view is especially justified when sewer system is supplying the sewage to biological sewage treatment plant. In such a case, complicated biological and chemical processes ongoing in the sewer system, change the state of the sewage and, in fact, should be considered as a part of sewage purification process. This point of view is specifically true in a situation when time of storage (retention) in the sewer system is large enough for substantial increase of biomass of heterotrophic organisms. The biochemical processes of transformation and degradation of pollutants in trunk sewers supplying sewage to the treatment plant, are able to influence the technological process of purification due to decrease of total pollutants load and change form of particular pollutants in the sewage. This is the reason why sewer system and sewage treatment plant should be considered as a complex sewage purification system. This paper is an attempt to create a model for the description of processes running in the gravity sewer system in the presence of saprobiontic biomass and aerobic condition.

PL

Grawitacyjne systemy kanalizacyjne od pewnego czasu są również postrzegane jako reaktory biochemiczne, a nie tylko narzędzie transportu ścieków z miejsca ich wytworzenia. Ten punkt widzenia wydaje się słuszny szczególnie wtedy, gdy kolektory kanalizacyjne doprowadzają ścieki do oczyszczalni z częścią biologiczną. W takim właśnie przypadku procesy fizyczne i biochemiczne, powodujące biodegradację zanieczyszczeń zawartych w ściekach, dają podstawy, aby traktować przewody kanalizacyjne jako system wstępnego podczyszczania ścieków. Wydaje się to szczególnie prawdziwe w sytuacji, gdy czas przetrzymania ścieków (retencji) w kolektorach systemu kanalizacyjnego jest wystarczająco drugi dla znaczącego przyrostu biomasy heterotroficznej, będącej czynnikiem procesowym we wspomnianych przemianach biochemicznych. Procesy biodegradacji zanieczyszczeń w kolektorach doprowadzających ścieki do oczyszczalni często mają znaczący wpływ na procesy oczyszczania ścieków poprzez zmianę ładunku oraz formy występowania poszczególnych zanieczyszczeń. Tak więc kolektory kanalizacyjne powinny być traktowane jako swoisty bioreaktor, będący częścią kompleksowego systemu oczyszczania ścieków. Niniejsza praca ma na celu prezentację modelu numerycznego, opisującego procesy zachodzące w grawitacyjnych systemach kanalizacyjnych przy obecności biomasy organizmów heterotroficznych.