Physico-chemical treatment applied to compost liquor: feasibility study

Jérémy Gagnaire (1, 2) , Laurent Chapon (2) , Philippe Moulin (1) , Benoît Marrot (1)

1 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres
2 SEM - Société des Eaux de Marseille

Compost liquor was treated using a combination of physico-chemical processes: (i) lime precipitation, (ii) filtration on a rotary drum vacuum precoat filter, (iii) ultrafiltration, and (iv) reverse osmosis. Laboratory Jar tests showed the interest of using lime to precipitate compost liquor. Yields of ammonium removal up to 90% were obtained for an optimum lime concentration of 6 g/ L. A test was run at semi-industrial scale on 400 L of highly loaded compost liquor (COD: 15,800 mg/L, ammoniacal pollution: 18,433 mg NH4+-N/L, conductivity: 74,000 μS/cm) to demonstrate the potential of the treatment process proposed. Outstanding purification yields were obtained, especially 95% of COD removal and 93% of ammoniacal pollution removal.

Mots clés: Compost liquor; Reverse osmosis; Lime precipitation; Rotary drum vacuum filter; Lab and semi-industrial scales

Domaines: Génie des procédés

Jérémy Gagnaire, Laurent Chapon, Philippe Moulin, Benoît Marrot. Physico-chemical treatment applied to compost liquor: feasibility study. Journal of Industrial and Engineering Chemistry, 2012, 18 (4), pp.1522-1528. ⟨10.1016/j.jiec.2012.02.016⟩. ⟨hal-00997209⟩