Rabea-Luisa, Schubert Kompetenzzentrum Wasser Berlin 16/05/2018, POWERSTEP Conference, Munich

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1 YOUR FLUSH, OUR ENERGY FULL SCALE DEMONSTRATION OF ENERGY POSITIVE SEWAGE TREATMENT PLANT CONCEPTS TOWARDS MARKET PENETRATION Rabea-Luisa, Schubert Kompetenzzentrum Wasser Berlin 16/05/2018, POWERSTEP Conference, Munich Funded by the Horizon 2020 Framework Programme of the European Union Grant agreement No

2 Full-scale performance of a microscreen as primary treatment for enhanced carbon extraction

3 Objectives Stable operation 80% COD extraction 2% DM in microsieve primary sludge Determination of biomethane potential of primary sludge Study impact on biological treatment process (effluent threshold values have to be kept) 3

4 Case Study 1: WWTP Westewitz Small WWTP < 5000 PE Inflow < 500 m³/d Biological treated in 2 SBRs (parallel) Sludge is thickened by gravity on site 4

5 WWTP incl. POWERSTEP upgrades 5

6 WWTP Westewitz with drum filter 6

7 Drumfilter Operation 18 months of continuous operation Monthly high pressure cleaning Two chemical cleanings During start up phase: Unxpected issues with automatic valves Blockage of the drumfilter due to turbidity peaks caused by the regular supernanant withdrawal 7

8 Water Qualitiy Influent WWTP COD BOD 5 NH 4+ -N NO 3- -N NO 2- -N TN TP [mg/l] Average N samples Minimum < Maximum Design conc

9 COD Extraction Polymer Dosing: Av. COD Extraction No: 30.3% Low: 40.0% Med: 44.3% High: 53.7 % 9

10 TS in Primary Sludge Polymer Dosing 10

11 Biomethane Potential Tests Source: 11

12 Effluent WWTP COD BOD 5 NH 4+ -N NO 3- -N NO 2- -N TN TP [mg/l] Average N samples Minimum < < 0.05 < Maximum * 9.0 Limit value ** 8 * Threshold value was exceeded ones due to shortening of aerated times ** For wastewater temperatures > 12 C 12

13 Unmanned Operation since January 2018 Drumfilter operation was taken over by the local operator of the WWTP (OEWA) Great thanks to the OEWA team 13

14 Summary and Conclusions Trouble free operation over 12 months Dosing of polymer: COD extraction strongly depends on influent composition Low polymer dose ( < 2.5 mg/l) is more cost efficient Performance of jar tests prior to planning process Medium polymer dose (> 2.5 mg/l) leads to a distinct decrease in backwash volume Unit successfully transferred to local operator // read more Deliverable 1.1, 1.2 and

15 Acknowledgement POWERSTEP is an innovation action project supported by the European Union under the Horizon 2020 Framework Programme. Contract no Duration: 1/07/15 30/06/18 15

16 FULL SCALE DEMONSTRATION OF ENERGY POSITIVE SEWAGE TREATMENT PLANT CONCEPTS TOWARDS MARKET PENETRATION Rabea-Luisa Schubert Kompetenzzentrum Wasser Berlin Funded by the Horizon 2020 Framework Programme of the European Union Grant agreement Nr

17 Back up 17

18 Hydraulic Behaviour 18

19 Operation Trouble Shooting Planning High COD extraction leading to insufficient denitrification capacity Feeding of SBRs with filtrated wastewater only: Detoriation of settlerablilty anticipated Not expected to that extent Not expected Not expected Operation Decrease in denitrification rates observed, but capacity was still sufficient Slight increase in SVI, but no operational issues due to that Depletion based oxygen control with low minimum aeration time leading to inhibited nitrification and an erratic increase in ammonium concentrations Malfunctioning of values for feeding Turbidity peaks and blockage of the filter caused by supernatant withdrawal 19