Study on activated sludge flocs morphology and composition in a full-scale wastewater treatment plant in Poland

Abstract

This work is a comprehensive study of a full-scale municipal wastewater treatment plant (WWTP) in the city of Zgierz (Poland) aiming at the estimation of the impact of seasonal changes of temperature on flocs morphology, biomass concentration, quantity of filamentous bacteria, content of polyhydroxybutyrate (PHB) and composition of microinvertebrates in the activated sludge system. Two short-term measurement campaigns, in winter and in summer, were carried out under dry weather conditions. It occurred that lower temperatures (11.1-14.6 °C) had hardly any effect on flocs size or concentration of activated sludge biomass in the full-scale activated sludge system treating municipal wastewater. They did not aggravate the biosynthesis of PHB either. However, decreasing temperature favored the growth of filamentous bacteria and led to the elevation of the sludge volume index (SVI). In spite of this, it did not induce any bulking events. Irrespective of the season, the groups of crawling ciliates, attached ciliates and testate amoebae, indicating good performance of the full-scale plant tested, were predominant.

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“…The high diversity of microorganisms and their simultaneous uneven distribution depends on wastewater flow rate, wastewater composition and dissolved oxygen concentration, temperature, and pH. The experiments demonstrate that the maintenance of stable key parameters, including wastewater flow rate and biochemical oxygen demand, leads to the development of a particular composition within the activated sludge biocenosis, which is supported by multiple studies [25][26][27][28].…”

An Innovative Process for Efficient Data Evaluation in an Atmospheric Geochemical Survey of Contaminated Soil

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Statistical Evaluation of Quantities Measured in the Detection of Soil Air Pollution of the Environmental Burden

“…The analyser consists of two In the environment are the most widespread light non-aqueous phase liquid LNAPL, polycyclic aromatic hydrocarbons (PAH) [18]. It is also likely that, as oil production and its transport increases, water, soil and sediment pollution will continue to increase [19,20]. In the environment, PAHs are subject to volatility, photo oxidation, chemical oxidation, and adsorption to soil particles [21].…”