Natural processes to convert treated waste water into a usable surface water. a Dutch-Catalan cooperation. Ruud Kampf and Lluis Sala

Transcription

1 Natural processes to convert treated waste water into a usable surface water a Dutch-Catalan cooperation Ruud Kampf and Lluis Sala AIGUA A LA CARTA Processos i tecnologies: L adequació de la qualitat de les aigües als diferents usos 19 de Novembre 2009 Gran Hotel Princesa Sofia, Barcelona Contents Conclusions Words of thanks!! Clear water through nature Empuriabrava, Everstekoog, Grou Mesocosms: biological filtration Waterharmonica in practice 1

2 Is it Nature?? Or a process?? Daphnia reactor Biological filtration Algae reactor for nutrient storage Free flow wetland as phototrophic biofilm reactor Fish spawning area to meet EU biodiversity criteria LinkedIn: Waterharmonica: the natural link from tap to source 2

3 Clear water through nature STP and wetland system Empuriabrava Visitor centre 3

4 Wet meadow for birds Application of polished effluent Visitor centre Cortalet Natural park Aiguamolls d l Emporda Well treated waste water as source for the natural park 4

5 Use of naturally upgraded effluent in Aiguamolls Nature park Supply water in the 18-ha manmade Cortalet lagoon to avoid its summer desiccation and/or to restore wet meadows in the surrounding area avoid the eutrophication removal of nutrients needed! Reduce discharges in the Muga river Preservation of the local habitats and their specific flora and fauna STP wetland system 5

6 : Some of the results: Water quality Since 2007, almost all the flow is reused thanks to the new third biological reactor Performance in 2008: Total-N removal 85% approx. 6,300 kg N P-removal variable Better: remove in STP!! Total P removal greater annual variability 47% approx. 2,700 kg P Some of the results: nature!! 6

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8 Everstekoog, Texel sewage treatment t tplant presettling basin 9 parallel ditches with reed/cattail and aquatic plants discharge ditch Research project Aqualân Grou

9 Aqualân Grou and STP 17 Aqualân Grou: fish species 9 Juli 2008 Fish species Daphnia pond End of reed Fish pond Baars 9 Blankvoorn 54 Kleine modderkruiper 4 Paling 2 Ruisvoorn 6 Tiendoornige stekelbaars Zeelt 5 Brasem 2 Driedoornige stekelbaars 1 Snoek 3 Giebel 2 Kolblei 2 Riviergrondel 6 European Water Frame Work Directive: Biodiversity!!!!!! 9

10 Equal experiments on three STP s Horstermeer Netherlands Effluent Filtrated effluent Grou Netherlands Parallel to ponds Empuriabrava Spain Parallel to ponds Daphnia ponds Mesoscosms for research on biological filtration 10

11 Empuriabrava No shade Shade 11

12 Empuriabrava wetland system E-coli E-Coli (Log nr/100 ml) Empuriabrava wetland system and mesocosms E-coli E-Coli (Log nr/100 ml) 12

13 Empuriabrava wetland system and mesocosms Clostridium Log Clostridium spores (nr/100 ml) Empuriabrava wetland system Clostridium Log Clostridium spores (nr/100 ml) Biological filtration leads to much better disinfection!! 13

14 Empuriabrava: wetland system and mesocosms E-coli Effluent STP Daphnia ponds and wetland Log Fecal Coli (nr/100 ml) Mesocosms HRT = 4 days Effluent Grou: E-Coli Daphnia ponds Surface waters Kromme Grou and ditch Log E-Coli (nr/100 ml) Mesocoms Reed ditches Spawning pond 14

15 E-Coli comparison Log nr/100 ml Empuriabrava Grou Log removal Wetland system Emp = 2.4 Grou = 1.5 Mesocosm Emp = 2.9 Grou = 2.3 Grou: Suspended solids Effluent STP Daphnia ponds Reed ditches Spawning pond Mesocoms Effl mesocosms Daphnia Reed Spawning STP a4 b4 pond ditches pond 15

16 Empuriabrava: Suspended solids mg/l uent STP Mesocoms HRT 1, 2 3 and 4 days Daphnia ponds and wetland Fate of suspended solids in Waterharmonica systems Total suspended solids Formed in wetland From activated sludge plant 16

17 Daphnia food chains Empuriabrava Grou Everstekoog Influence of a wastewater discharge A physical chemical B nutrients C micro organisms D macro organisms Based on Hynes, 1960 The biology of polluted waters 17

18 Schematic effect of discharges of wastewater A physical chemical B nutrients C micro organisms D macro organisms Based on Hynes, 1960 The biology of polluted waters The Waterharmonica: Bridge between sewage treatment and surface water Waterharmonica Based on Hynes, 1960 The biology of polluted waters 18

19 Existing (constr ) Everstekoog Grou Ootmarsum Land van Cuijk Klaterwater Efteling Hapert Sint Maartensdijk WATERHARMONICA SYSTEMS Ameland PLANNED (2009 -?) Bergumermeer Garmerwolde Marum Vollenhove Horstermeer and Amstelveen Berkenwoude Enschede: Kristalbad Haarlo Dreumel Geldermalsen: under design Valburg Dussen Den Bosch: Dieze monding Tilburg-Oost Soerendonk 2010: subsidised by Dutch Innovation program Biest-Houtakker Sources: policy plans water authorities Senter-Novem innovation programme Waterharmonica Soerendonk Zie: Primeur op rwzi Soerendonk, H 2 O/ New Waterharmonica system part of landscape reconstruction plan converting treated waste water into a quality suited for nature creating wet nature water storage, flood prevention Project cost Innovation subsidy Ready in

20 Waterharmonica Soerendonk Fish spawning area, like in Grou The Buulder Aa Reed ditches Sand filtration Daphnia ponds Waterharmonica Kristalbad Enschede New Waterharmonica system reconstruction plan 50 ha nature-water-landscape-recreation project cost innovation subsidy Ready in 2010? 20

21 Is it Nature?? Or a process?? Daphnia reactor Biological filtration Algae reactor for nutrient storage Free flow wetland as phototrophic biofilm reactor Fish spawning area to meet EU biodiversity criteria Waterharmonica: natural link between treated wastewater and nature 21