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Prevention of struvite scaling in digesters combined with phosphorus removal and recovery—The FIX-Phos Process

Petzet, Sebastian and Cornel, Peter (2012):
Prevention of struvite scaling in digesters combined with phosphorus removal and recovery—The FIX-Phos Process.
In: Water Environment Research, Water Environment Federation, pp. 220-226, 84, (3), ISSN 1061-4303,
DOI: 10.2175/106143012X13347678384125,
[Article]

Abstract

The fixation of phosphorus (FIX-Phos) combines struvite prevention and phosphorus recovery by the addition of calciumsilicatehydrate (CSH) particles into the anaerobic digester. The CSH fixates phosphorus as calcium phosphate and reduces the phosphorus concentration in the sludge water that allows for control of struvite formation. The phosphorus-containing recovery product can be separated and recovered from the digested sludge. In pilot plant experiments, 21% to 31% of phosphorus contained in digested sludge could be recovered when CSH was added at concentrations of 2 g/L to 3.5 g/L to a mixture of primary sludge and waste activated sludge (WAS) from enhanced biological phosphorus removal. The recovery product contained few heavy metals and a phosphorus content of 18 wt % P2O5, which allows for recycling as fertilizer. The fixation of phosphorus within the digester may increase wastewater sludge dewaterability. The phosphorus recycle stream to the headworks of the wastewater treatment plant is reduced.

Item Type: Article
Erschienen: 2012
Creators: Petzet, Sebastian and Cornel, Peter
Title: Prevention of struvite scaling in digesters combined with phosphorus removal and recovery—The FIX-Phos Process
Language: English
Abstract:

The fixation of phosphorus (FIX-Phos) combines struvite prevention and phosphorus recovery by the addition of calciumsilicatehydrate (CSH) particles into the anaerobic digester. The CSH fixates phosphorus as calcium phosphate and reduces the phosphorus concentration in the sludge water that allows for control of struvite formation. The phosphorus-containing recovery product can be separated and recovered from the digested sludge. In pilot plant experiments, 21% to 31% of phosphorus contained in digested sludge could be recovered when CSH was added at concentrations of 2 g/L to 3.5 g/L to a mixture of primary sludge and waste activated sludge (WAS) from enhanced biological phosphorus removal. The recovery product contained few heavy metals and a phosphorus content of 18 wt % P2O5, which allows for recycling as fertilizer. The fixation of phosphorus within the digester may increase wastewater sludge dewaterability. The phosphorus recycle stream to the headworks of the wastewater treatment plant is reduced.

Journal or Publication Title: Water Environment Research
Volume: 84
Number: 3
Publisher: Water Environment Federation
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Technology
Date Deposited: 13 Jul 2017 06:56
DOI: 10.2175/106143012X13347678384125
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