Agglomeration of struvite crystals

作者：Le Corre Kristell S; Valsami Jones Eugenia; Hobbs Phil; Jefferson Bruce; Parsons Simon A^*

来源：Water Research, 2007, 41(2): 419-425.

DOI：10.1016/j.watres.2006.10.025

• struvite
• particle size
• polyDADMAC
• coagulation
• zeta-potential

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 (Al3+ and Fe3+), 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.

• 出版日期2007-1