Dissolution of particulate phosphorus in pig slurry through biological acidification: A critical step for maximum phosphorus recovery as struvite.

Recycling phosphorus as struvite from pig slurry requires an acidification step to dissolve the inorganic solids containing most of the phosphorus. This study focused on the biological acidification of several pig slurries using sucrose as a model organic co-substrate. Lactic acid fermentation occurred systematically, dissolving 60-90% of TP (total phosphorus) and T-Mg (total magnesium) at pH 6 or lower.

Sequencing biological acidification of waste-activated sludge aiming to optimize phosphorus dissolution and recovery.

Phosphorus (P) recovery in wastewater treatment plants (WWTP) as pure crystals such as struvite (MgNHPO.6HO), potassium struvite (KMgPO.6HO) and calcium phosphates (e.

Phosphorus recycling potential assessment by a biological test applied to wastewater sludge.

Phosphorus (P) recycling as mineral fertilizer from wastewater activated sludge (WAS) depends on the amount that can be dissolved and separated from the organic matter before the final crystallization step. The aim of the biological phosphorus dissolution potential (BPDP) test developed here was to assess the maximum amount of P that could be biologically released from WAS prior that the liquid phase enters the recovery process. It was first developed for sludge combining enhanced biological phosphorus removal and iron chloride.