Wastewater treatment and its potential for recycling management
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1 For our Environment 7 Water Research Horizon Conference June 2016 Wastewater treatment and its potential for recycling management Dr. Bettina Rechenberg Head of Division Sustainable Production and Products, Waste Management German Environment Agency
2 What can we get from waste water? RECYCLING OF SUBSTANCES REUSE OF WATER RECOVERY OF ENERGY 7 Water Research Horizon Conference 2
3 Recycling of Substances Phosphorus Nitrogen Other Substances? 7 Water Research Horizon Conference 3
4 Phosphorus Phosphorus Recovery as a Conservation of Resources: P is essential for life and can not be substituted P is a limited resource 90 % of known P-sources in 5 states only Germany (Europe) is totally dependent on P-import Quality is decreasing: Concentrations of contaminants such as Cadmium and Uranus are increasing P-digging is destroying the environment 7 Water Research Horizon Conference 4
5 Phosphorus P-resources in mass flows * P/a Waste water & sewage sludge meat- & bone meal Excess of manure 75,000 t 68,000 t 10,800 t 240,000 t * in Germany, own inquiry 7 Water Research Horizon Conference 5
6 Phosphorus Special BMBF/BMUB initiative (since 2004): Impulse of the utilization of plant nutrients from diverse mass flows (for example waste water, sewage sludge, sewage sludge ashes, meat- and bone meal, manure) Stimulation of innovative methods for manufacturing of fertilizers or components of fertilizers Research is done, knowledge required for phosphorus recycling and techniques are available in principle Now focus is on setting the legal and economic conditions for the production and use of recycled phosphorus now 7 Water Research Horizon Conference 6
7 Nitrogen Recycling of Nitrogen: N is not a limited resource Release of reactive nitrogen increased by ten times since 1913 (UBA 2011) N-Recycling from wastewater is not a priority, minimizing release of N 2 O during wastewater treatment 7 Water Research Horizon Conference 7
8 Other Substances Recycling from other nutrients (e.g. potassium), metals, rare earth elements no data available for all recovered substances there has to be a market potentially 7 Water Research Horizon Conference 8
9 Water Reuse Water Reuse is discussed and under survey for agricultural irrigation, irrigation of urban parks etc., within industrial applications, groundwater recharge, river recharge... Lots of research aktivities on national level BMBF WavE and European level 7 Water Research Horizon Conference 9
10 Water Reuse But, lack of a discussion on minimum quality requirements and the need to assess environmental impacts studies which integrate risk analysis across the various elements of water reuse schemes are urgently needed modelling tools for identifying the most efficient focus for water recycling in production processes including analysis of environmental impacts (energy demand, amount of waste ) are required to make water reuse a more integrated part of the production process the principle of precaution (including the principle of reversibility) has to be implemented, especially when a variety of potentially hazardous substances (e.g. micro pollutants) is spread in large areas with long-term consequences for human health and soil and groundwater logistical problems (resources for the infrastructure and costs) which arise to transport waste water from the places where it is produced to the (agricultural) areas, where it is needed, have to be consiedered reuse of waste water may not be an adequate measure for water-rich regions 7 Water Research Horizon Conference 10
11 Energy Production and Wastewater Treatment Plants Renewable Energy Directive Wastewater Treatment Plants Heating and cooling Combined heat and power (CHP - KWK) Biofuels Biogas storage Renewable energies Biogas combustion in CHPs In Germany: Wastewater treatment plants (WWTP) can contribute to the three pillars of the European renewable energy policy! WWTPs produce one third of the plant s total power demand and almost 100% of the required heat (power demand: 4.2 TWh/a production: 1.35 TWh/a) WWTPs are responsible for 10-30% of the municipal power demand Increasing the energy recovery from wastewater yields positive effects on various levels! 7 Water Research Horizon Conference 11
12 Possible Energy Related Improvements on the WWTP Typical Flow Scheme of the Most Common German WWTP Influent Bar Screening Primary Sedimentation Biological Treatment Final Sedimentation Effluent Add household biodegradable waste More biogas Increased C Exclusion more biogas Return Sludge Aeration Decreased power consumption Biogas Maybe redundant Electricitywith membrane technology There is room for improvement in almost every process step. Not all measures can Boundary be included in existing plants - generates new possibilities for energy efficient WWT systems Primary Sludge Anaerobic Digestion Link biogas production and energy markets Fertilizer Treat sludge dewatering water seperately Waste Sludge Heat Use of excess heat Energy Markets Balancing energy Combined Heat And Power 7 Water Research Horizon Conference 12
13 Foster Energy Related Investment in Wastewater Treatment Sector National Level Exit from nuclear and fossil-fuel energy in Germany in 2000 Contribution of WWTPs: BMBF project ERWAS 12 projects, 27 Mio. UIP (Environmental Innovation Program) Projects of the UBA focuses on projects that are well suited for demonstration purposes and hence for replication 11 projects towards an optimization of the WWTP s energy consumption Various strategies: decreased power consumption, increased C-exclusion, additional C sources, ORC technique 7 Water Research Horizon Conference 13
14 Foster Energy Related Investment in Wastewater Treatment Sector Municipal level Examples: WWTP Hamburg Use of a new aerator lead to a power consumption decrease of 20% Additional C sources (co-substrates like glycerin) for biogas generation, construction of 2 windmills, photovoltaic modules energy positive since 2011 WWTP Bremen Increased efficiency of the CHP plant, additional power generation of 12% 7 Water Research Horizon Conference 14
15 Conclusion Priority task of wastewater treatment plants - the treatment of wastewater for environmental and health protection - will remain but change from a sectoral focus to an integrative focus - coupling wastewater treatment with other sectors like energy system and supply of raw material improve image of waste water treatment (e.g. USA: Wastewater Treatment Plant Resource Recovery Centre) 7 Water Research Horizon Conference 15
16 Thank you for your attention. Dr. Bettina Rechenberg Head of Division Sustainable Production and Products, Waste Management German Environment Agency
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