Resource recovery from sludge treatment at Waterboard De Dommel (Netherlands) Jan-Evert van Veldhoven
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1 Resource recovery from sludge treatment at Waterboard De Dommel (Netherlands) Jan-Evert van Veldhoven
2 Contents Transition to resource recovery Innovation agenda waterboard De Dommel Projects related to sludge treatment Energy factory Tilburg WWTP as a logistic centre Biopolymers Drivers/barriers
3 Transition Safeguarding public health Protecting the environment Focus on energy reduction due to global warming Increasing attention towards resource scarcity
4 Vision / mission wastewater Waste water = Pollution + water Water + energy + recources
5 Target Explore the opportunities recovering resources from raw sewage water. Develop the opportunities and then produce raw materials. Closing cycles and if possible at the same time reducing the societal expenses. To create value out of the recovered material (new) markets and sales also has to be developed.
6 WWTP as a resource factory?
7 Open innovation Prof H. Chesbrough UC Berkeley, 2004 Combining internal knowledge with external knowledge to catalyze the innovation process Profits: 1. Access to talent anywhere 2. Provides access to New Markets and Customers 3. It stimulates growth in the long term 4. Stimulates technology providers
8 Innovation agenda Waterboard de Dommel main themes 1. Sustainable cities 2. WWTP and local environment 3. Industry 4. Sludge treatment Commissioning energy recovery facility/plant with THP/Anammox and phosphate recovery WWTP as logistical centre - connection with manure treatment, waste water sludge and organic household waste Bioplastics demonstration of producing bioplastics and fatty acids Partner in demonstrating supercritical gasification (day 2)
9 Commissioning energy recovery facility/plant with THP/Anammox and phosphate recovery
10 WWTP Tilburg (NL): Energy and P recovery influent Sedimentaion tank Sedimentaion tank effluent Aeration tank Anammox Sludge Phospaq dewatering tds External sludge: - WWTP Biest Houtakker - WWTP Haaren (6%ds) Sludge Digesters Cambi - Sludge dewatering site Mierlo (25% ds)
11 Challenges Commitment of the board of waterboard De Dommel Reduce operational costs vssustainable solution (nexus energy/chemical use/sludge incinerator) investment Technological challenges Thermal hydrolysis/anammox (Toxic components, high NH4 concentrations) P precipitation in piping Energy ballance Innovative tendering Procurement through market consultation Contractor determines the solution What to do with the struvite What to do with the surplus biogas CNG, LNG, green gas, electricity production..
12 WWTP as a logistic centre: Energy efficiency, create low N/P organic fertilizer Central location for biomass conversion: Wastewater sludge, household waste, manure processing Create valuable products Create synergy in the use of utilities
13 Resource WWTP
14 Problem definition Nitrogen Phosphate P saturation of soil in Netherlands Solution for household waste/sludge exists Problem: animal manure % saturated surface / ha Annual supply of P to soil and groundwater Annual removal of P from soil and groundwater Annual surplus of P in soil and groundwater
15 Feasibility study Concepts manure treatment: 1. Autothermal aerobic thermophilic treatment 2. Mesophilic (mono)digestion Feasibility study: Processing costs manure EUR/ton manure Export costs EUR/ton manure 18 maart
16 Manure pilot: aerobic thermophilic treatment Reactor scrubber Ammonium sulphate P recovery struvite Manure air HCl dewatering MgO Low N/P Organic matter
17 Pilot results Stipping of manure 70-80% efficiency Low BOD 5 content in manure Autothermal conditions due to low BOD 5 not possible High ph (>9) in manure Biology influenced by high ammonia concentrations
18 Synergy Exchange energy (electricity, heat) Creating N/P low organic matter Discharging water throug WWTP (calamity control) Working together with agricultural sector in order to reduce N/P leaching to ground- and surface water and reach surface water goals Create products (ammoniunsulphate and struvite) Combined use of skilled personnel
19 PHA production PHARIO project Polyhydroxyalkanoate (PHA) is a group of biodegradable polymers produced by micro-organisms using a carbon source as substrate bacteria are abundant in activated sludge
20 PHA production - history 2011: AnoxKaldnes Aquiris RWZI Brussel, production 1kg PHA/day : AnoxKaldnes en KNN Bioplastic en Wetterskip Fryslân, 1 st tests at WWTP Leeuwarden in the Netherlands 2014: Waterschap De Dommel, Brabantse Delta, Wetterskip Fryslân door AnoxKaldnes en KNN Bioplastic, desk study if PHA production on dutch wastewater is possible 2015 pilot at WWTP Bath 2017 demonstration plant??
21 Partners Waterschap Brabantse Delta Waterschap de Dommel Wetterskip Fryslân STOWA KNN Anoxkaldnes Pilot: 10 months WWTP Bath Goals: - Constant quality of PHA - PHA quality vs.market demands - Environmental impact (LCA) - Tool applicability on other WWTP
22 Thank you! 10/07/
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