7th meeting of the collaborating partners of the “ANATHREPSI” project

7th meeting of the collaborating partners of the “ANATHREPSI” project

On Wednesday, 8th of December 2021, the 7th meeting of the collaborating partners of the ANATHREPSI project took place, via teleconference (Webex) due to precautions taken against COVID 19. The meeting participants were:

Pantelis Gkliaos, TEDRA (Project Coordinator)

Prof. Anastasios Karabelas, NRRE/CPERI/CERTH (Scientifically Responsible)



  1. Karanasiou, NRRE/CPERI/CERTH
  2. Tsaridou, NRRE/CPERI/CERTH
  3. Oikonomou, TEDRA
  4. Patsikas, TEDRA
  5. Mermigkas, TEDRA

The main topic of the meeting was the valorization of the nanofiltration (NF) products from the pilot unit that has started operating in BIZIOS S.A. facilities after its design and construction at NRRE/CPERI/CERTH. The treatment of the liquid effluent of the Anaerobic Digester that operates at BIZIOS S.A produces two streams, the permeate and the retentate of NF membranes. The conclusions after the products’ characterization and the corresponding legislative limits were the following:

  • The NF permeate could be used at BIZIOS S.A. facilities for industrial uses as recycling water or as water for restricted irrigation. Alternative but not preferable option is the further biological treatment of the permeate for safe disposal at Elassonitis river.
  • The NF retentate could be utilized in the production of fertilizers. The partners from TEDRA executed tests and realized that the NF retentate cannot be directly applied to selected crops due to its high electrical conductivity value that exceeds the allowed levels and causes drying of the plants. However, all attendees agreed in the investigation of struvite (ΝΗ4MgPO46H2O) precipitation through the addition of magnesium salts/compounds in the NF retentate. Struvite precipitation is a well-established technology for the treatment of wastewater with parallel recovery of nutrients that is widely applied in the production and synthesis of fertilizers.

More information at the following link: www.anathrepsi.org