A pilot plant for the valorization of olive mill wastewaters by recovering of water, extraction of high value bio-molecules and production of biogas

Transcription

1 Valorisation of olive mill effluents by recovering high added value bio-products A pilot plant for the valorization of olive mill wastewaters by recovering of water, extraction of high value bio-molecules and production of biogas Salvatore FALCO CRIOL - Industria Olearia Biagio Mataluni srl (Italy) criol@mataluni.com

2 LAY-OUT the plant is near the olive oil mill CAPACITY 1 m 3 /h FLOTTATORE CENTRIFUGA DECANTER UF FLOTTATORE OI FILTROPRESSA NF RESINE CENTRIFUGA DECANTER UF FILTROPRESSA BIOGAS OI NF RESINE BIOGAS

3 PRE TREATMENT MEMBRANE FILTRATION ADSORBENT RESINS TANK OLIVE MILL WASTE POLYELECTROLITE PRODUCTION OF BIOGAS FLOTATOR OIL AND SLUDGES DECANTER SOLID COMPONENT POMACE concentrate VERTRICAL SEPARATOR FILTER PRESS Concentrate rich in polyphenols Industrial uses (washing) PURIFIED ULTRAFILTRATION NANOFILTRATION REVERSE OSMOSIS Water component ADSORBENT RESINS PHENOLIC EXTRACT Water component ANAEROBIC DIGESTER Digestate COMPOST BIOGAS Combustion

4 OLIVE MILL WASTE PRETREATMENT OIL AND SOLID FRACTION (ADDED TO THE POMACE) POLYELECTROLYTE ULTRAFILTRATION CONCENTRATE COMPRESSED AIR TANK FLOTATOR EQUALIZATION TANK DECANTER IN THIS PHASE IS AIMED TO REMOVE OIL AND SOLIDS AS THEY WOULD CREATE PROBLEMS IN THE MEMBRANE FILTRATION PHASES. THE AIM IS TO INCREASE THE PERMEABILITY AND REDUCE THE MEMBRANE FOULING. SLUDGES TO BE ADDED TO THE POMACE FILTERED DIATOMACEAOUS FILTER AID FILTER PRESS MEMBRANE FILTRATION VETRICAL SEPARATOR EQUALIZATION TANK

5 Lamellar flotator The combined action of a current of compressed air and of the addiction of flocculants and coagulants determines the separation of: sedimentable solids (bottom) suspended solids and oil (top).

6 DECANTER 2 functions: remove solids from the effluent (after the flotation) and reduce the water content in the sludges (separated in the flotation and in the centrifugation phases), which are then added to the pomace. A software manages the different flows that feed the decanter.

7 CENTRIFUGE The clarified effluent, after the decanter, is further centrifuged in a vertical centrifugal separator with high rotation speed, in order to remove the less sedimentable solid component. It is equipped with a timed discharge device, which discharge the solids automatically at 5 intervals. The separated solid component is added to the pomace.

8 FILTER PRESS In order to reduce the turbidity and eliminate any colloidal solids which may be remained suspended, the effluent is filtered in a filter press on a siliceous filter aid. The OMWW is pumped within plates covered with filtering cloths, on which the diatomaceaous filter aid is stratified. The pre treated OMWW are sent to the membrane filtration section.

9 DECANTER CONCENTRATE CONCENTRATE ADSORBENT RESINS BIOGAS PRE TREATED EFFLUENT PERMEATE PERMEATE ULTRAFILTRATION NANOFILTRATION REVERSE OSMOSIS PROTEINS POLIPHENOLS SALTS PURIFIED MEMBRANAE MEMBRANAE MEMBRANE 6 vessels with 1 membrane 8 each vessel Membrane surface 32,5 m 2 Cut off 100 kda 2 vessels with 2 membranes 8 each vessel Membrane surface 32,5 m 2 Cut off 500 Da 2 vessels with 2 membranes 8 each vessel Membrane surface 32,5 m 2 Rejection MgSO 4 94%

10 the feed stream moves parallel to the membrane surface; the permeate passes through the membrane pores and is collected in the central permeate collector; the retentate (the materials excluded by the membrane pores) continues through the recirculation loop Unlike normal flow filtration, cross flow filtration continuously sweeps the membrane surface by circulating the feed stream across it. This circulation minimizes blinding of the membrane pores and promotes consistent, long term productivity.

11 DECANTER CONCENTRATE CONCENTRATE ADSORBENT RESINS BIOGAS PRE TREATED EFFLUENT PERMEATE PERMEATE ULTRAFILTRATION NANOFILTRATION REVERSE OSMOSIS PROTEINS POLIPHENOLS SALTS PURIFIED MEMBRANAE MEMBRANAE MEMBRANE 6 vessels with 1 membrane 8 each vessel Membrane surface 32,5 m 2 Cut off 100 kda 2 vessels with 2 membranes 8 each vessel Membrane surface 32,5 m 2 Cut off 500 Da 2 vessels with 2 membranes 8 each vessel Membrane surface 32,5 m 2 Rejection MgSO 4 94%

12 NANOFILTRATION CONCENTRATE SECTION OF ADSORBENT RESINS ETHANOL NaOH solution in water ADSORPTION DESORPTION REGENERATION POLIPHENOLS ANAEROBIC DIGESTER 50 kg 62 liters DISTILLATION Anaerobic digester or water purification plant ANTIOXIDANT EXTRACT

13 Selection of the adsorbent resin Macronet MN-202 Purolite Adsorbent Polymer Non ionic adsorbent resin Highly cross-linked Very high internal surface area Particularly suited for the adsorption of organic molecules with high molecular weight present in industrial wastewaters

14 ANAEROBIC DIGESTER Capacity : 3 m3 REVERSE OSMOSIS CONCENTRATE PROCESS PARAMETERS Temperature: 37 C (mesophilic conditions) ph : 6 8 Batch process Inoculum: cattle manure or sludges from a working digester Substrate: reverse osmosis concentrate and nanofiltration concentrate after adsorption on resins. BIOGAS

15 REVERSE OSMOSIS CONCENTRATE NANOFILTRATION CONCENTRATE AFTER ADSORPTION ON RESIN BIOGAS It is a biological process. In anaerobic conditions, the organic substance is converted in biogas by a heterogeneous bacterial population. COMPOSTING PRE TREATMENT SOLID COMPONENT COMPONENT

16 Project RE-WASTE «Recovery, recycling, resource. Valorisation of olive mill effluents by recovering high added value bio-products» THANK YOU FOR YOUR ATTENTION