Influence of road salt thawing peaks on the inflow composition and activated sludge properties in municipal wastewater treatment
نویسندگان
چکیده
Abstract Operational data over 2 years from three large Austrian wastewater treatment plants (WWTPs) with design capacities of 4 million, 950,000 and 110,000 population equivalent (PE) were examined. Salt peaks, due to thawing road salt detected quantified by electrical conductivity, temperature chloride measurement in the inflow WWTPs. Daily NaCl loads up 1,147 t/d PE-specific 0.26–0.5 kg NaCl/(PE · y) found. To mimic plants' behaviour a controlled environment, was dosed into laboratory-scale activated sludge plant. The influence peaks on important parameters such as volume index, settling velocity floc size investigated. Influent effluent sampled extensively calculate removal rates. Respiration measurements performed quantify activity. Particle distributions sizes measured using laser diffraction particle sizing showed decrease approximately two-thirds. structure examined documented light microscopy. At concentrations below 1 g/L, increased respiration found for autotrophic biomass, between 3 g NaCl/L inhibited 30%.
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ژورنال
عنوان ژورنال: Water Science and Technology
سال: 2021
ISSN: ['0273-1223', '1996-9732']
DOI: https://doi.org/10.2166/wst.2021.045