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Struvite (MgNH4PO4.6H2O) solubility and its application to a piggery effluent problem

Webb, K.M. and Ho, G.E. (1991) Struvite (MgNH4PO4.6H2O) solubility and its application to a piggery effluent problem. In: Workshop on Appropriate Technology for Environmentally Sustainable Development / conducted for ASEAN delegates by Remote Area Developments Group, 2 July, Perth, Australia pp. 39-45.

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Struvite (MgNH4P04• 6H20) solution chemistry was studied in order to understand a struvite scaling problem which exists in the pipe network of a series of 4 effluent lagoons at a piggery. Struvite deposits frequently occur in piping from the final effluent pond intended for irrigation purposes, causing severe scaling of the pipe, making irrigation or other end uses of the effluent impossible. The conditional solubility constant (P. = SMg .SNH3-N•SPO.-P, equilibrium S values (M) was determined over the range of pH values (6.8-8.5) and solution concentrations of Mg, NHa-N and P04-P close to field conditions, and at a temperature of 30°C. A comparison of field and laboratory data indicates struvite precipitates from the second lagoon onwards. The solubility data obtained also indicate potential for precipitation as a method of nutrient removal from wastewaters.

Publication Type: Conference Paper
Murdoch Affiliation: School of Biological and Environmental Sciences
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