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The solubility of struvite and its application to a piggery effluent problem

Webb, Kelvin M. (1988) The solubility of struvite and its application to a piggery effluent problem. PhD thesis, Murdoch University.

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Abstract

This project was commenced to research problems observed with a large piggery near Mandurah, Western Australia. These problems were caused by the deposition of a bio-mineral magnesium salt, struvite (MgNH4PO4.6H20), within the waste treatment system of the piggery.

A review of previous research on struvite properties relevant to this project was firstly conducted, indicating the need for determination of more appropriate solubility data for struvite formation in solution.

Experiments to monitor conditions at the piggery were the next stage in research.

Laboratory solubility experiments were then commenced. These were at a temperature of 30oC and pH values between 6.5 and 8.5. Data were analysed as the conditional solubility constant Ps defined as below,

Ps = [Mg]tX[Nh4]tX[PO4]t

A qualitative comparison of field and laboratory solubility data indicates struvite may precipitate from the third and fourth lagoons in the treatment systems, and possibly the second lagoon.

These inferences are by no means conclusive, and further Ps data over differing experimental conditions are required to fully explain the problem and its solution.

Publication Type: Thesis (PhD)
Murdoch Affiliation: School of Biological and Environmental Sciences
Notes: A digital copy of this thesis is not available. Your library can request a copy from Murdoch University Library via Document Delivery. A fee applies to this service.
UNSD Goals: Goal 12: Responsible Consumption and Production
Supervisor: Ho, Goen and Wrigley, Tim
URI: http://researchrepository.murdoch.edu.au/id/eprint/37804
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