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Protecting Our Waterways Removal of Nutrients from Wastewater David Rei Miller Masters Student Sumit Banker PG Diploma Student Dr Steven Pratt Lead Author.

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Presentation on theme: "Protecting Our Waterways Removal of Nutrients from Wastewater David Rei Miller Masters Student Sumit Banker PG Diploma Student Dr Steven Pratt Lead Author."— Presentation transcript:

1 Protecting Our Waterways Removal of Nutrients from Wastewater David Rei Miller Masters Student Sumit Banker PG Diploma Student Dr Steven Pratt Lead Author Dr Andy Shilton CETE Director

2 Nutrient Removal Research Domestic Other Gould Systems, Steelserv Industrial Forest Research Industrial Fonterra Domestic Centralised PNCC, RDC

3 Presentation Outline 1 Problem Nutrient Pollution 2 SolutionsNitrogen Removal Biological Filter Phosphorus Removal Active Rock Filter

4 Nutrient Pollution Groundwater Blue Baby Syndrome NO 3 - carcinogen production NO 3 - Surface Waters toxic to fish NH 3 algal blooms N and P eutrophication N and P Methemoglobinemia similar to “Blue Baby”

5 Eutrophication 1. Nutrient enrichment 2. Algal growth 3. Decay of algae 4. Oxygen consumption Oberlin, OH (before) Oberlin, OH (after)

6 Eutrophication Eutrophication in Hawkes Bay region

7 Sustainability Protecting Our Waterways drinking, recreation resource cultural values kaitiakitanga, legal obligations Sustainable Technology low energy, cost, maintenance low environmental impact

8 Nitrogen Domestic Wastewater urea, proteins, amino acids 80 mg-N/L total (from onsite) Discharge Limits 10 mg-N/L NO 2 - /NO 3 - USEPA 30 mg-N/L total (from onsite) Hawkes Bay

9 Nitrogen Removal Foam Media Biofilter biological (microorganisms) onsite wastewater treatment target 10 mg-N/L effluent Key Results to Date 30 mg-N/L effluent typical nitrification, denitrification confirmed nitrification identified as limiting  likely limited by lack of oxygen

10 Septic Tank + Biofilter Flotation & Settling Org-N  NH 3 - Nitrification & Denitrification NH 3 -  NO 3 -  N 2 Influent Wastewater Treated Effluent

11 Nitrogen Removal in Biofilter Foam media for biomass growth Aerobic NH 3  NO 3 - Anoxic NO 3 -  N 2 Cutaway of one foam block showing anoxic zone

12 Nitrogen Removal Sustainability Potential no forced aeration no addition of carbon inert end product But… foam life, regeneration uncertain electricity required (pumps, controls)

13 Phosphorus Domestic Wastewater detergents, various foods 5-20 mg-P/L as DRP Discharge Limits 1 mg-P/L as TP (to bay) Brisbane 1 mg-P/L as DRP (to stream) Waipukurau not set for onsite Discovery of P (1669)

14 Phosphorus Removal Active Rock Filter physical + other mechanisms small community treatment can add to existing pond (or onsite) Key Results to Date limestone 64% P removal steel slag 72% P removal

15 Phosphorus Removal Active rock filter bed, Waiuku

16 Phosphorus Removal P Influent Wastewater Treated Effluent Possible mechanisms: ion exchange adsorption precipitation 74% P Removal

17 Phosphorus Removal Sustainability Potential no energy input required low cost simple and “low tech” like ponds But… design life, loadings need research regeneration, extraction of P needs research

18 Summary Nutrient removal is essential for sustainability of water resources. N Removal can be achieved onsite by foam media biofilter. Low cost P Removal possible with an active rock filter.

19 Acknowledgments Warrick Gould Gould GT Systems Technology NZ Palmerston North City Council Steelserv Rock Filter Researchers


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