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Prevention of Struvite Scaling in Digesters Combined With Phosphorus Removal and Recovery—The FIX‐Phos Process
Author(s) -
Petzet Sebastian,
Cornel Peter
Publication year - 2012
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13347678384125
Subject(s) - struvite , phosphorus , enhanced biological phosphorus removal , chemistry , phosphate , sewage treatment , wastewater , pulp and paper industry , activated sludge , waste management , environmental science , environmental chemistry , environmental engineering , organic chemistry , engineering
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 % P 2 O 5 , 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.