Phosphorus recovery in aerated systems by MAP precipitation: optimizing operational conditions.
An attractive way of recovering essential phosphorus from digested sludge of a WWTP is the precipitation in the sludge directly, as part of the continuous treatment process. For optimizing the precipitation, 1 litre-batch tests were performed in a model system to examine the MAP-crystallization kinetics. Different parameters such as e.g. the aeration flow rate were investigated. The aim was to find an optimized setting for a pilot reactor for the continuous production of MAP. This reactor performed as an airlift reactor for an improved mixing and stripping the dissolved CO2 and separating the MAP-crystals. The optimal condition for the airlift pilot reactor is given when the air flow rate for mixing the system and for stripping CO2 for a maximum MAP precipitation is aligned with the particle size distribution.
Stumpf
D
D
Technische Universität Berlin, Chair of Chemical Engineering, ACK 7, Ackerstrasse 71-76, 13355, Berlin, Germany. daniel.stumpf@tu-berlin.de
Zhu
H
H
Heinzmann
B
B
Kraume
M
M
D000388:Air; D011232:Chemical Precipitation; D003247:Conservation of Natural Resources / Q000379:methods*; D017616:Magnesium Compounds / Q000737:chemistry*; D010316:Particle Size; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D000069877:Struvite; D013696:Temperature
D017616:Magnesium Compounds; D010710:Phosphates; D010758:Phosphorus; D000069877:Struvite