1. Sequencing biological acidification of waste-activated sludge aiming to optimize phosphorus dissolution and recovery
- Author
-
Simon Piveteau, Felipe Guilayn, Marie-Line Daumer, Etienne Braak, Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE), Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), UR OPALE, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), French National Agency for Water and Aquatic Environments (ONEMA), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA), and Daumer, Marie-Line
- Subjects
Restaurants ,crystallization ,[SDV]Life Sciences [q-bio] ,Potassium ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,Solid Waste ,01 natural sciences ,calcium phosphate ,active sludge ,acidification ,chemistry.chemical_compound ,boue activée ,Waste Management ,Dietary Sucrose ,phosphorus solubilization ,Recycling ,phosphore soluble ,eaux usées ,Waste Management and Disposal ,Dissolution ,WAS fermentation ,nutrient recovery ,organic waste ,waste-activated sludge ,Water Science and Technology ,Sewage ,Waste management ,green manure ,Biological acidification ,phosphate de calcium ,Phosphorus ,General Medicine ,Hydrogen-Ion Concentration ,6. Clean water ,Milk ,cristallisation ,Sewage treatment ,Industrial Waste ,chemistry.chemical_element ,industrial water ,struvite ,12. Responsible consumption ,Animals ,Environmental Chemistry ,0105 earth and related environmental sciences ,valorisation des déchets organiques ,engrais vert ,Biodegradable waste ,020801 environmental engineering ,Activated sludge ,Solubility ,chemistry ,Struvite ,Hydrochloric Acid - Abstract
Phosphorus (P) recovery in wastewater treatment plants (WWTP) as pure crystals such as struvite (MgNH4PO4.6H2O), potassium struvite (KMgPO4.6H2O) and calcium phosphates (e.g. Ca3(PO4)2) is an already feasible technique that permits the production of green and marketable fertilizers and the reduction of operational costs. Commercial crystallizers can recovery more than 90% of soluble P. However, most of the P in WWTP sludge is unavailable for the processes (not dissolved). P solubilization and separation are thus the limiting steps in P-crystallization. With an innovative two-step sequencing acidification strategy, the current study has aimed to improve biological P solubilization on waste-activated sludge (WAS) from a full-scale plant. In the first step (P-release), low charges of organic waste were used as co-substrates of WAS pre-fermentation, seeking to produce volatile fatty acids to feed the P-release by Polyphosphate-accumulating organisms, while keeping its optimal metabolic pH (6-7). In this phase, milk serum, WWTP grease, urban organic waste and collective restaurant waste were individually applied as co-substrates. In the second step (P-dissolution), pH 4 was aimed at as it allows the dissolution of the most common precipitated species of P. Biological acidification was performed by white sugar addition, as a carbohydrate-rich organic waste model, which was compared to chemical acidification by HCl (12M) addition. With short retention times (48-96 h) and without inoculum application, all experiences succeeded on P solubilization (37-55% of soluble P), principally when carbohydrate-rich co-substrates were applied. Concentrations from 270 to 450 mg were achieved.
- Published
- 2016
- Full Text
- View/download PDF