Use of a seeder reactor to manage crystal growth in the fluidized bed reactor for phosphorus recovery.
The authors have been engaged in the development of a phosphorus recovery system capable of maintaining high recovery efficiencies, with the chemical cost suppressed. This time, they conducted demonstration tests of a fluidized bed magnesium ammonium phosphate reactor provided with a seeder reactor for the supernatant from anaerobic digestion using a pilot experimental plant with a wastewater treatment capacity of 20 m3/d. For the digestion supernatant with a phosphorus concentration of approximately 300 mg/L, the treated water phosphorus concentration was 10 to 25 mg/L, and the phosphorus recovery efficiency was more than 90%. Relative to the chemical cost in the case of magnesium chloride, the chemical cost in the case of magnesium hydroxide is approximately 40%. Thus, with the new system, it was possible to reduce the running cost while maintaining high recovery efficiencies.
Shimamura
Kazuaki
K
EBARA Corporation, 4-2-1 Honfujisawa, Fujisawa-shi 251-8502, Japan. shimamura.kazuaki@ebara.com
Ishikawa
Hideyuki
H
Tanaka
Toshihiro
T
Hirasawa
Izumi
I
D000693:Anaerobiosis; D019149:Bioreactors; D003460:Crystallization; D015636:Magnesium Chloride / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry / Q000378:metabolism; D008276:Magnesium Hydroxide / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry / Q000378:metabolism; D010758:Phosphorus / Q000737:chemistry* / Q000302:isolation & purification*; D000069877:Struvite; D014865:Waste Disposal, Fluid
D017616:Magnesium Compounds; D010710:Phosphates; D015636:Magnesium Chloride; D010758:Phosphorus; D000069877:Struvite; D008276:Magnesium Hydroxide