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If data do exist, one should need them Aim of DWA A 198 Verification is always necessary (are the results plausible?)13Īims and application of A- 198Examination of existing data (self-monitoring, specific monitoring programms) as well as derivation of dimensioning values and forecast values for various time horizons (planning criteria) Adjustment of dimensioning values of sewer systems and wastewater treatment plants Harmonizing the symbols for dimensioning as extensively as possible Mathematical determination of the dry weather flow (dissociated from meteorological records) Approach for the determination of the combined wastewater flow (Qcomb) at the interface sewer wastewater treatment plant Determination of concentration of N and P on the basis of COD as a master parameterĪims and application of A- 198However: because of the temporal variable releases of standards and leaflets there are yet much different terms and symbols for the same facts However: the needed flows, loads and concentrations for dimensioning are to be found in the respective standards (e.g.
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How to start with the dimensioning?Which input parameters are needed?Load of BOD (or COD) Load of total nitrogen Load of total Phosphorous Load of TSS Temperature Mean flows Maximum flow (minimum flow) Wastewater flow Concentration = Load Wastewater flow Concentration = LoadĬan be measured ! Cannot be measured directly ! Literature values (Loads) and measured values (flow and/or concentrations) often cannot be brought into agreement easily!12 Treatment process design in m3/d hydraulic design in m3/h l/s Types of Wastewater (WW)Municipal WWDomestic or Household WW Industrial, Commercial, Institutional WW Infiltration WW (Imported, Sewer Infiltration, Parasite Water) Stormwater Introduction and repetitionIndustrial Wastewater1,2 2,8īillion m/aDesign of WWTP 1. Secondary sludge = Excess sludge Biogas Gas storageĭewatering and -agricultural use -landfill -incineration Digester 35C Thickener and storage tank9 Primary sediment.īiological treatmentAeration tank Secondary sediment. to Koppe and Stozek, 1999) : 76% Urine 14% Faeces 10% Washing and cleaning agents Nges TKNīasic Flow Scheme of a WWTPPrimary treatmentScreening Influent Grit Grease rem. Nitrogen (N) - Parameters for Dimensioning The specific load of nitrogen is 11 to 13 g/(capd)7 Specific Load and Concentration of NutrientsThe specific load of phosphorus decreased within the last years due to the reduction of P in detergents to Raach et al., 1999 ): 70% Urin and Faeces 17% Washing powder/liquid 13% Kitchen wastePtotal Phosphorus (P) Parameter for DimensioningSpecific load per inhabitant (acc. to ATV-DVWK A 131, 2000): 60 g BOD5/(Cd) Only a part of the organic wastewater constituents are readily degradable5 to ATV-DVWK A 131, 2000): 120 g BOD5/(Cd) BOD (Biochemical oxygen demand)Amount of oxygen required for the biological oxidation of organic compounds BOD5: Degradation time = 5 days Temperature = 20 C Nitrogen, phosphorus Hg, Pb, Cd, Cr, Cu, Ni Acids, bases, hydrogen sulfide Hot water Hydrogen sulfide, othersĬarbon (C)- Parameters for DimensioningCOD (Chemical oxygen demand)Amount of oxygen required for the chemical oxidation of organic compounds Oxygen depletion in water bodies Detergents, pesticides, fat, oil, phenols,endocrine d. Toxicity, bioaccumulation in the food chain, Eutrophication, oxygen depletion Toxicity, bioaccumulation Toxicity, corrosion Changing living conditions for flora and fauna Aesthetic inconveniences, toxicity Of special interestPathogenic bact., viruses and worm eggsĮnvironmental effectRisk when bathing and eating fishes Fish death, odors, deterioration of drinking w. Wastewater Treatment PlantCorg, Norg, PorgĬomponents in Wastewater and their EffectsComponentMicroorganisms Biodegradable organic material Other organic material Nutrients Metals Other inorganic material Thermal effects Odour (and taste) Radioactivity4 Introduction and repetitionAim of biological Waste water treatment:Removal of carbon compounds (BOD5, COD) Reason: prevent oxygen depletion of receiving waters Removal of nutrients (nitrogen, phosphorus) Reason: prevent eutrophication of receiving watersCO2, N2 Determination of inflow parametersĬontents of the lectureDetermination of inflow parameters (ATV-DVWK - A 198) Microbiological processes/activated sludge process Dimensioning of activated sludge treatment plants (ATV- A 131) Nitrogen removal Phosphorous removal Dimensioning of biofilters Sludge treatment and dimensioning of sludge treatment plants Resource orientated systems Anaerobic systems Planning process Exercise Excursion Heidrun Steinmetz Institute for Sanitary Engineering, Water Quality and Solid Waste Management - Chair of Sanitary Engineering and Water Recycling 1ĭesign of WWTP 1. Lecture 1Introduction and Determination of inflow parameters