Definitions Process water = water with different quality characteristics than drinking water serving commercial, industrial, agriculatural or similiar purposes (DIN 4046). Greywater = part of the household wastwater without faecal matter and urine (blackwater). Greywater is the drain from bath tubs, shower trays, washbasins and washing machines. It may also contain high-polluted kitchen wastewater. (British standard 8525-1:2010) 1. What is on-site greywater reuse?
General flow schematic decentralised greywater treatment system 1. What is on-site greywater reuse?
Ideal building types 1. What is on-site greywater reuse?
Distribution of water consumption in residential buildings saving potential around 50 % Drinking water Treated greywater 38 % body care 2 % drinking/cooking 7 % dish washing 33 % toilet 13 % laundry 5 % others 2 % garden irrigation 1. What is on-site greywater reuse?
Typical water consumption in buildings source building type body care* [L/p*d] toilet [L/p*d] washing machine [L/p*d] Green irrigation residential building50-9020-3515-25 Depending on green area 60 – 200 L/m²*a hotel complex60-20020-4515-30 office building15-5010-305-20 sports facility50-15010-255-20 Existing information sheets and guidelines just give estimations/recommendations fbr information sheet H201 British Standard 8525-1 DIN 1989-1 about rainwater harvesting systems *showers, bath tubs, handwash basins L = litre; p = person; d = day; m² = squarmeter; a = year Greywater Process water 1. What is on-site greywater reuse?
Code of practice for general requirements hygienical / microbiological safe colorless and clear particle free free from unpleasant odour emission British Standard 8525-1: 2011 about greywater reuse 2. Quality requirements for reuse EU bathing water guideline 2006/7/EC DIN 19650 hygienic concerns of irrigation water
hygienical / microbiological safe colorless and clear particle free free from unpleasant odour emission British Standard 8525-1: 2011 about greywater reuse 2. Quality requirements for reuse comparing German limits about coliform bacteria: raw milk: 10.000 cfu/100 mL soft cheese: 1.000 cfu/g minced meat: 5.000.000 cfu/g Code of practice of general requirements EU bathing water guideline 2006/7/EC DIN 19650 hygienic concerns of irrigation water
3. Treatment technique combination of aerobic biological sludge treatment and external submerged membrane filtration system. Ultrafiltration flatsheet membranes separating activated sludge from biologically treated wastewater.
3. Treatment technique state of the art in Europe exceeding all guidelines 100% barrier for sludge/particles 99,9% barrier for germs absolut clear water small footprint eco-friendly without chemicals packaged system by system manufacturer high investment costs maintenance costs
3. Treatment technique combination of aerobic biological sludge treatment and UV-desinfection batches: fill => react/aeration => settle => decant
3. Treatment technique with UV-desinfection state of the art in Europe exceeding all guidelines 99,9% barrier for germs eco-friendly without chemicals low maintenance costs low energy consumption not guaranteed clear water (e.g. foam) UV-efficiency depends on biological efficiency large footprint
3. Treatment technique constructed wetlands with additional desinfection combined treatment systems (sandfilter, carbon-filter, chlorine station) multi-layer-filters not common and proven in long-term-operation insufficient biological treatment => odour, foam,… mixed technology– no packaged and tested units