Agglomeration of struvite crystals |
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Authors: | Le Corre Kristell S Valsami-Jones Eugenia Hobbs Phil Jefferson Bruce Parsons Simon A |
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Affiliation: | School of Water Sciences, Cranfield University, Cranfield MK43 OAL, UK. |
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Abstract: | Struvite crystallisation is widely studied as a way to remove phosphorus from wastewater effluents and simultaneously generates a valuable product for the fertiliser industry. However, to date, some crystallisation processes experimented at either pilot/or full scale face problems linked to the formation of fines. This paper presents results on the investigation of struvite agglomerative properties and the possible application of coagulants and/or flocculants to remove fines. Coagulants investigated were hydrolysing metals salts (Al(3+) and Fe(3+)), calcium compounds and a cationic polymer, polydiallyldimethylammoniumchloride (polyDADMAC). The effects of a natural flocculant (alginate) have also been tested. Results demonstrated that destabilisation of struvite particles by chemical addition was feasible and identified polyDADMAC as a good option for the agglomeration of struvite particles. However, optimisation of its dosage under typical pH conditions for struvite formation showed floc formation to be very pH sensitive. |
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Keywords: | Struvite Particle size PolyDADMAC Coagulation Zeta-potential |
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