Actions and project development
“The LIFE NECOVERY project was divided into technical, monitoring project, management and communication actions”
In this group, were included:
a) the preliminary and implementation actions required to define, design and ensemble the prototype, b) the demonstrative trials on-site, c) the actions of technical, economic and environmental assessment.
In Figure 2, the scheme of the proposed WWTP flowsheet and technical tasks are shown. These actions are also listed below.
A1. Definition of the configuration and basic prototype flowsheet
A1.1 Selection of WWTP and characterization of the streams of the WWTP
WWTP selection: medium WWTP with primary settler, biological reactor and AD
- Recompilation of historical operational data.
- Sampling campaign: Influent/Effluent: SS, COD, BOD5, TKN, NH4-N, TP, PO4-P and its speciation (particulate, colloidal or dissolved).
A1.2 Selection and basic design of the overall flowsheet
Definition of the final overall flowsheet.
B1. Pre-concentration unit design
CEPT-biosorption pre-concentration technique:
- Biological adsorption: physical uptake of pollutant by microbial cells. Aerobic reactor (low SRT, high sludge loading rate) + settling tank.
- CEPT -> addition of iron salts to primary sedimentation basins.
Achieve an acceptable level of SS in the up-concentration effluent adapted to nutrient recovery unit + obtain concentrated organic PS for AD.
B2. Advanced digestion unit design
- Anaerobic digester
- Extra separation step àcentrifuge.
- Struvite reactor àaddition of industrial Mg sources.
- Maximise biogas production.
- Concentrated digestate to be used as natural stable fertiliser.
- Maximise N-P recovery from supernatant.
B3. Nutrient recovery design to treat the up-concentration effluent
- CoagulationàIron addition to recover P.
- Ultrafiltration -> removal of SS and the coagulated P to protect zeolites.
- Adsorption with zeolites àadsorption of soluble COD
Proposed configuration were validated by:
- Literature research, contact with technology suppliers, tests at Avecom site of different zeolites and coagulants,etc. Criteria: low energy consumption and N/P recovery
B4. Construction and assembly of the different prototypes devices
- Selection of providers
- Construction and assembly of the pilot considering design done in A1, B1, B2 and B3.
- Integration of the pilot in Vilanova WWTP.
- Start-up of the pilot carried out by CETaqua with the support of Avecom in pre-concentration and AD units.
- Hydraulic tests of each module.
- Start up of each module and the total treatment train.
B5. Operation of the full system
B5.1 Operation of the integrated system and data collection.
- Production of data to calculate its main features and acquire experience about the integrated process and its operation.
- Several conditions tested to assess:
- COD, BOD5, SS, N, P removal capacity of the up-concentration unit.
- Biogas production.
- N/P recovery capacity by struvite precipitation.
- N capacity adsorption of zeolites, etc.
B5.2 Technical assessment.
Global efficiency was assessed according to several criteria comprising at least: technical efficiency,energy consumption, maintenance and durability of equipment and chemicals consumption.
B6. Energetic balance, environmental and economic benefits assessment
B6.1 Energetic balance
- Assessment of the energy balance considering two proposed recycling routes for sludge (fuel/compost) and its integration in the full system. (Digested sludge can have different properties than CASàselection of the most appropiate valorisation route).
- Assessment of the overall energy balance and comparison with a conventional WWTP.
B6.2 Environmental impact assessment.
- Assessment of the environmental impact and the benefits of a plant including the system developed in this project, in comparison with a reference configuration àLCA methodology.
B6.3. Economic evaluation through a LCC analysis.
- Assessment of the economic benefits, in monetary terms, of the new flowsheet, compared with the conventional ones
a) LCC methodology
b) Creation of cost functions and models for general evaluations
B7. Viability assessment and implementation strategies for WWTPs
- Viability assessment of the full system to determine the potential for future development and implementation of the flowsheet.
- Identification of application strategies.
Cases study assessment
- Large WWTP with primary treatment and AD (PE>100,000 )
- Medium WWTP without AD (40,000 -100,000 PE)
- WWTP with a highly loaded first step and a lowly loaded second step.
- Retrofitting of existing WWTPs that have to deal with considerably increasing loads.
- Construction of new WWTPs.
Figure 2. Scheme of the proposed WWTP flowsheet and technical tasks
This second group included all the actions related to project monitoring, management and communication tasks. They are listed below.
C1. Monitoring of the effectiveness and the impact of the project actions
C1.1. Monitoring approach
C1.2. Efectiveness indicators
C1.3. Impact indicators
D1. Communication and dissemination
D1.1. Communication plan
D1.2. Logo and applications
D1.3. Project website
D1.5. Notice board and stickers
D1.7. Layman’s report
D1.10. Awareness manual
D1.11. Workshop organisation
D1.12. Organisation of visits and presentations
D1.13. Dissemination in workshops and conferences
D1.14. Communication database
D1.15. Dissemination through the LIFE+ external communication team
E1. Project management
E1.1. Project management structure
E1.2. Project management methods
E1.3. Project management tools
E1.4. Progress monitoring methods
E1.5. Quality control
E1.6. Management of legal aspects
E1.7. Independent external audit
E2. Networking with other projects
E2.1. Networking group
E2.2. Meetings, events and conferences
E3. After-LIFE communication plan
E3.1. Target audience
E3.2. Actions: website, seminars/workshop, video