On-site greywater treatment and reuse applications, quality requirements, treatment solutions 5th June 2013 Beirut, Lebanon I am… Markus Sellner Degreed engineer of Environmental protection Living in Göttingen / Germany Productmanager for decentralised water management Employeed at DEHOUST since April 2008 1. What is on-site greywater reuse? 1. What is on-site greywater reuse? Definitions 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) Process water = water with different quality characteristics than drinking water serving commercial, industrial, agriculatural or similiar purposes (DIN 4046). 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 Drinking water Treated greywater 33 % toilet 38 % body care 13 % laundry 2 % drinking/cooking 7 % dish washing 5 % others 2 % garden irrigation saving potential around 50 % 1. What is on-site greywater reuse? Typical water consumption in buildings Existing information sheets and guidelines just give estimations/recommendations • fbr information sheet H201 • British Standard 8525-1 • DIN 1989-1 about rainwater harvesting systems source building type body care* [L/p*d] toilet [L/p*d] washing machine [L/p*d] residential building 50-90 20-35 15-25 hotel complex 60-200 20-45 15-30 office building 15-50 10-30 5-20 sports facility 50-150 10-25 5-20 Greywater *showers, bath tubs, handwash basins L = litre; p = person; d = day; m² = squarmeter; a = year Green irrigation Depending on green area 60 – 200 L/m²*a Process water 2. Quality requirements for reuse 2. Quality requirements for 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 • EU bathing water guideline 2006/7/EC • DIN 19650 hygienic concerns of irrigation water 2. Quality requirements for reuse Code of practice of general requirements hygienical / microbiological safe BS 8525-1 2006/7/EC DIN 19650 public green areas, sports area, vegetables < 10 - - pH 5 – 9,5 - - about greywater reuse coliform bacteria [cfu/100 mL] 1.000 10.000 - • EU bathing water guideline 2006/7/EC Escherichia coli [cfu/100 mL] 250 1.000 < 200 • DIN 19650 colorless and clear particle free name free from unpleasant odour emission turbidity [NTU] • British Standard 8525-1: 2011 hygienic concerns of irrigation water 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 3. Treatment technique 3. Treatment technique General flow chart 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 4. LEED-Certification 4. LEED-Certification 110 possible points Simple certificate: 40 – 49 Points Platinum certificate: 80 Points or higher 4. LEED-Certification 110 possible points Simple certificate: 40 – 49 Points Platinum certificate: 80 Points or higher 5. Audiance Discussion Time for questions Thank you for your attention !