Enhancing phosphorus recovery by a new internal recycle seeding MAP reactor
Resource
Bioresource Technology 99 (14): 6488-6493
Journal
Bioresource Technology
Journal Volume
99
Journal Issue
14
Pages
6488-6493
Date Issued
2008
Date
2008
Author(s)
Abstract
Phosphorus is a depleting resource that needs recovery from wastewater streams. The magnesium ammonium phosphate (MAP) crystallization process could simultaneously recover ammonium nitrogen and phosphorus at equal molar basis to yield slow-release MAP fertilizer. However, the present MAP processes are not efficient in recovering phosphorus at low P concentrations. This work presented and tested the performance of a newly proposed MAP reactor, the internal recycle seeding reactor (IRSR) that comprised of a reaction zone and a settling zone connecting with an internal recirculation loop. Owing to the enhanced secondary nucleation rates of MAP crystals in reaction zone under controlled circumstance, the proposed IRSR recovered 78% of phosphorus from wastewater at a low level of 21.7 mg-P L-1. The optimal operation parameters for the IRSR were investigated with synthetic wastewater and determined as that the Mg/PO43 --P molar ratio was 1.3-1.5:1, THRT was up to or longer than 1.14 h, the seed concentration of reaction zone was 0.40-1.0 g L-1. Further needs for the proposed IRSR strategies were also discussed. © 2007 Elsevier Ltd. All rights reserved.
Subjects
Internal recycle seeding reactor; MAP; Phosphorus recovery; Seed
Other Subjects
Chemical reactors; Crystallization; Phosphorus; Recycling; Seed; Internal recycle seeding reactor; Phosphorus recovery; Wastewater treatment; ammonium magnesium phosphate; phosphorus; Chemical reactors; Crystallization; Phosphorus; Recycling; Seed; Wastewater treatment; ammonium compound; crystallization; magnesium; nucleation; performance assessment; phosphorus; recovery; wastewater; water treatment; article; crystallization; priority journal; reactor; reactor design; recycling; waste water; Magnesium Compounds; Phosphates; Phosphorus
Type
journal article
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