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Phosphorus removal from the effluent of a brewery wastewater treatment plant

Charles, W., Mathew, K. and Ho, G.ORCID: 0000-0001-9190-8812 (1999) Phosphorus removal from the effluent of a brewery wastewater treatment plant. In: Proceedings of the International Regional Conference on Environmental Technologies for Wastewater Management, 4 - 5 December 1997, Perth, Western Australia



Brewery wastewater final effluent treated by activated sludge, although adequately reducing BOD5 and suspended solids, contains significantly high levels of phosphorus (1 500-2 000 μg/L). Further phosphorus removal was achieved by additional chemical precipitation and/or soil amendment.

Red Mud neutralised with Gypsum (RMG) and red sand were found to be effective soil amendment media. The adsorption of approximately 0.076 mgP/g of red sand was achieved before media loss of phosphorus adsorption capacity, determined by phosphorus breakthrough in the effluent. The addition of 10% RMG was found to increase the adsorption capacity to approximately 0.114 mgP/g of the mixed media. A further increase of RMG to 20% and 30% slightly increased phosphorus adsorption capacity, however this significantly decreased the flow rate through the media.

With chemical precipitation, up to 90% phosphorus removal was achieved using 3 moles of aluminium sulphate or 6 moles of ferric chloride per mole of phosphorus.

To ensure phosphorus discharge levels meet regulatory requirements, combined chemical precipitation followed by soil amendment may be appropriate. Soil amendment will reduce the risk of phosphorus level fluctuation which occurs with chemical precipitation alone. In turn, chemical precipitation prior to soil amendment will significantly decrease phosphorus and suspended solids levels in the effluent. The infiltration rate and life span of soil media will thus be prolonged. The need to replace the media can be significantly reduced (or eliminated) if appropriate grass sp, which can remove 40-60 kgP/ha/yr, are planted in the disposal area.

Item Type: Conference Paper
Murdoch Affiliation(s): School of Environmental Science
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