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Trials at WCB demonstrated that dairy processing wastewater can be recycled through a treatment comprising a P removal system followed by a membrane bioreactor, followed by a reverse osmosis system and an ultraviolet light/chlorination disinfection system. This will successfully produce water of the required chemical and microbiological quality for WCB to meet potable standards and therefore find reuse within its production facilities. Installing such a system could enable WCB to satisfy their future demand for water and expand their operations.
As the quality of the water produced with the proposed system will be of potable quality, the current regulatory requirements would be fulfilled. An estimation of the value proposition showed that although there was no significant difference of the value compared to the cost of the proposed system for a 10-year period, the value was significantly higher for a 20-year period.
A stricter economic analysis should be carried out to ensure that the value proposition of the treatment system is viable.
Recommendations:
- Undertake a longer trial on the P recovery and membrane bioreactor systems to increase the confidence of the robustness of these systems and to ascertain how these systems will cope with seasonal and other variations in the plant and raw feed.
- Carry out an economic analysis to ensure that the value proposition of the proposed system is viable.
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