Approach in the agroindustry water management: a case study

1. Agenzianazionale per le nuovetecnologie, l’energiae lo sviluppoeconomicosostenibile Approach in the agroindustry water management: a case study Roberto Farina roberto.farina@enea.it UnitàTecnicaModelli, Metodi e Tecnologie per le Valutazioni Ambientali LaboratorioProtezionedellaRisorsaIdrica, via Martiri di Monte Sole, 4 - 40129 Bologna

2. Water use in industry • Cleaning- washing • Transport • Material • Heat • Dilution • Cooking • Product component

3. Water use in industry:quality • Legislation refer only at: • Discharge in the environment • Safety for the workers and products • Quality, just for the agroindustry

4. Water use in industry:quantity • Legislation refer only at: • IPPC directive • Local legislation • Local agreements with public authorities

5. Industry considered • Fruit industry with production of • Clear juice fruit • Concentrates juice fruits • Flavors • Desiccated fruit • Fourth range fruit

6. Industry considered • Use of water • Washing of fruit • Cleaning of machinery • Steam production • Quantity of water discharged 480mc/d

7. Wastewater cycle BIOGAS Toilette Acque di pioggia Fanghi a digestione Reflui PRODUZIONE FILTRO ANAEROBICO EQUALIZZATORE Effluente Aria AREA DI RINATURALIZZAZIONE Riciclo Fanghi SEDIMENTATORE VASCHE A FANGHI ATTIVI Canale di scarico reflui

8. Characteristics of the wastewater tested

9. Biomethanation test Test BMP effluent 2 Test BMP peelings 17 days 23 days Specific Production : 0.34 l CH4/g COD Specific Production: 0.43 l CH4/g SV

10. Continues flow UASB reactor SEPARATOR GLS RICIRCOLO FEEDING POINT

11. Effluent2 after UASB treatment Performances: Organicloadremoval: 92.8 % Total solidsremoval: 70 % Biogas quality: 89 % CH4

12. Effluent3after UASB treatment feed batch Performances: Organicloadremoval: 96 % Total solidsremoval: 49 % Biogas quality: 77 %

13. Effluent3aftermesophilic UASB treatment feed batch Performances: Organicloadremoval: 98 % Total solidsremoval: 45 % Biogas Quality: 85 % CH4

14. New waste water cycle peeling BIOGAS Toilette Acque di pioggia Concentratedwastewaters Fanghi a digestione PRODUZIONE FILTRO ANAEROBICO EQUALIZZATORE Dilutedwastewaters Effluente AREA DI RINATURALIZZAZIONE Canale di scarico reflui

15. Why and SBR reactor SBR (Sequencing Batch Reactors) activated sludge discontinuous biological treatment systems. Possibility to have in one basin all the different phases of a biological process (organic matter and nitrogen removal, sludge sedimentation)in different moments, not in different basins. The 4 different phases of an SBR are: Feeding Reaction Sedimentation Discharge all the different phases can variate according with the characteristics of the wastewater quality and quantity and according with the effluent characteristics.

16. Adavantages of the SBR technology • Management flexibility according with the possibility to change the duration of the different phases; • Simplification of the plant engineering; • Higher flexibility to organic and hidraulic loading changes; • Improving the sedimentability characteristics of the sludge according with the selection of the biomass; • Possibility/necessity of a complete automation of the process • Possibility to reduce the aeration cost

17. Conclusions • Not always it is necessary to apply new technologies to improve the wastewater treatment in an industry. • Segregation of effluents allow to reduce process volumes and provide better wastewater characteristics for each specific treatment. • Segregation of effluents allow the reuse of wastewaters even without treatment