“Water Resources Management: Needs and Prospects” Jordan, Amman, 22/04/2013 INTEGRATED SYSTEM FOR THE TREATMENT OF MUNICIPAL WASTEWATER AND BIODEGRADABLE SOLID WASTE Dr. Malamis Dimitris National Technical University of Athens School of Chemical Engineering Unit of Environmental Science and Technology

INTERWASTE Project INTERWASTE is co-funded by EU LIFE+ ENVIRONMENT INTERWASTE Partners National Technical University of Athens (Greece) Cyprus University of Technology University of Nicosia (Cyprus) Proplan Ltd (Cyprus) Department of Environment Ministry of Agriculture, natural Recourses and Environment .

Membrane BioReactor-Anaerobic Digester Aim of present work Development of an integrated system for sustainable treatment of Biodegradable Organic Waste and Municipal Wastewater with zero discharge Production of high quality, added value products Electricity and heat from renewable sources (organic waste) High quality effluent that can be reused (i.e. irrigation) High quality soil conditioner-compost This can be achieved through the integration of aerobic and anaerobic processes by employing: Membrane BioReactor-Anaerobic Digester MBR - AD

Potential users of the integrated MBR-AD system Generally places where production of waste and demand of the obtained products from waste treatment co-exist: Remote de-centralized regions Small communities Residential areas (i.e. blocks of flats) Hotels

Flow Sheet diagram MBR - AD MBR – treating municipal wastewater AD – treating biodegrdable organic waste ( in our case we mainly used food waste and sludge that results from the MBR unit) BIOGAS – purification of the biogas resulting from the anaerobic digestion and energy generation Digestate – the treatment of the digestate resulting from the AD process. Digestate is an semi-stabilized organic material. Bagfilter - σακόφιλτρο BIOGAS Digestate

The integrated system The MBR – AD Unit

Operating parameters MBR AD 1,5 m3/d municipal wastewater sludge outlet– 100 l/d => to AD AD Daily preparation of substrate. Formation of a mixture of 150L with 10% TS consisting of food waste and sludge from the MBR 150 L of digestate are separated into liquid and solid phase Solid phase => solar drier Liquid phase => recirculated to the MBR Operating volume 1.5 m3/d

Flow Sheet diagram MBR - AD Bagfilter - σακόφιλτρο

Stainless steal vessel 8,5 m3 MBR – BUFFER TANK Flow equalization tank that is used to regulate the wastewater flow to the MBR unit Stainless steal vessel 8,5 m3

Flow Sheet diagram MBR - AD Bagfilter - σακόφιλτρο

MBR Feedstock Municipal Wastewater from Buffer Tank (1,5 m3/d) Sludge fed to the Anaerobic Digestion System Sludge Effluent (water) This is the basic unit where the treatment of municipal wastewater is taking place. So we feed the MBR tank with Municipal wastewater at a rate of (1,5 m3/d) from the buffer Tank The Membrane BioReactor involves the biological oxidation and membrane filtration which results in the production of high quality water and sludge Membrane BioReactor (MBR) system for wastewater treatment

Flow Sheet diagram MBR - AD Bagfilter - σακόφιλτρο

Homogenization Unit – AD Substrate preparation This process mainly involves the mixing of organic waste streams in order to create a homogeneous substrate that is fed to the AD Homogenization Unit: Sludge from the MBR Food waste Target 10±2% TS

Flow Sheet diagram MBR - AD Bagfilter - σακόφιλτρο

Substrate from the Homogenization Unit Anaerobic Digester Biogas Substrate from the Homogenization Unit Total volume 8,5 m3 Operating volume 4,5 m3 Substrate feed 150 L/d with 10 % TS Mesophilic Temperature (≈35oC) SRT = 20-25days Digestate

AD – Biogas System Biogas Storage (Balloon 3m3) Biogas Composition Analysis Packed bed Scrubber (H2S) Biogas cleaning equipment Biogas contains hydrogen sulfide that must be removed as much as possible before reaching the gas processing equipment. Some digester vendors produce biogas with 1000-3000 PPM H2S which causes severe problems with the gas processing equipment. Biogas may be converted to energy in several ways. Burning it in a Combined Heat and Power unit generates electricity and heat. It may also be cleaned further and piped directly into gas lines, or compressed. The method used depends on capital costs and the price the energy can earn. CHP unit Biogas Meter Scrubber for biogas cleaning (VOC, ΝΗ3)

Biogas Cleaning System CHP unit for energy production Scrubbers for biogas cleaning

Flow Sheet diagram MBR - AD MBR – treating municipal wastewater AD – treating biodegrdable organic waste ( in our case we mainly used food waste and sludge that results from the MBR unit) BIOGAS – purification of the biogas resulting from the anaerobic digestion and energy generation Digestate – the treatment of the digestate resulting from the AD process. Digestate is an semi-stabilized organic material. Bagfilter - σακόφιλτρο Digestate

Bag Filter – Treatment of Digestate The liquid phase of the digestate is recireculated to the MBR unit in order to be further treated The solid waste is dried using a solar drier and it is transformed to a compost like material

ΜΒR performance % COD reduction

ΜΒR Performance TN reduction

ΜΒR Performance - NH4+ reduction

AD Performance – Biogas Production Biogas Composition CH4 = 59%, CO2= 40 %

Biogas - Energy Balance 33% 22% 55% Heat Biogas 100% 10% losses Electricity 35% 3.5 % 31.5%

MBR-AD potential applications Treating Biowaste & Municipal wastewater of a community with population of 1,000 persons in Cyprus covers the electricity needs of around 55 inhabitants or 19 households Produces 150 m3/d of water that can be used for irrigation Treating Biowaste & Municipal wastewater of a 5 star Hotel in Cyprus covers 3.4% of the needs for electricity and covers 3.6% of the heating needs Produces 250 m3/d water that can be used for irrigation

THANK YOU FOR YOUR ATTENTION Dr. Dimitris Malamis National Technical University of Athens School of Chemical Engineering Unit of Environmental Science and Technology dmalamis@chemeneng.ntua.gr www.uest.gr Tel: 2107723108 Fax: 2107723285