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07b Reclamation of treated urban water

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Presentation Diana Norton Brandão …

Presentation Diana Norton Brandão
on Dissolved organic nitrogen

Published in: Technology
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  • 1. Reclamation of treated urban waterDissolved organic nitrogenDiana Norton BrandãoPromotor: Jules van LierCo-supervision: Sigrid Scherrenberg29th May 2012
  • 2. ContentsI. What is DON?II. RelevanceIII. Research objectivesIV. Methodology and resultsV. Further research What is DON Relevance Objectives Meth. & Results Further research
  • 3. I. What is DON?- 65% of the dissolved nitrogen in effluents from conventional WWTP- Free aminoacids- Combined aminoacids- Proteins- Low-molecular-weight aliphatic amines such as methylamine, dimethylamine,piperidine and pyrroline- Nitrogen containing synthetic chelating agentsWhat is DON Relevance Objectives Meth. & Results Further research
  • 4. II. Relevance- European surface water criteria: Total N concentrations < 2,2 mg/L- DON and inorganic N may have different potential for eutrophication(bioavailability of DON is uncertain)- DON may form variety of nitrogenous disinfection by-products with muchstronger carcinogenicity than that of regulated DBPs- Little knowledge about DON What is DON Relevance Objectives Meth. & Results Further research
  • 5. III. Research objectives- Understand DON occurrence and composition in wastewater- Determine DON bioavailabilityWhat is DON Relevance Objectives Meth. & Results Further research
  • 6. IV. Methodology and results1) DON along tertiary filtration Persulfate digestion Collection, filtration Ion cromatography HL DON Phobic DON Philic XAD treatment What is DON Relevance Objectives Meth. & Results Further research
  • 7. IV. Methodology and results1) DON along tertiary filtration 6 sampling points, fractionation in Phi and Pho Samples DON P1 - HF 3,68 P1 - HB 0,75 4,42 P2 - HF 2,78 P2 - HB 0,31 3,09 P3 - HF 3,20 P3 - HB 0,29 3,50 SBBR filtration removes P4 - HF 1,93 DON P4 - HB 0,46 2,39 P5 - HF 1,32 P5 - HB 0,09 1,41 P6 - HF 0,96 P6 - HB 0,20 1,16 What is DON Relevance Objectives Meth. & Results Further research
  • 8. IV. Methodology and results2) Bioavailability tests: test mediums - Effluent + Algae + full nutrients - Effluent + Algae + full nutrients except NO3 - Effluent + Algae + no nutrients Effluent: untreated, philic fraction, phobic fraction What is DON Relevance Objectives Meth. & Results Further research
  • 9. IV. Methodology and results2) Bioavailability tests: preparation 1. Effluent filtration 2. Fraccionation philic/phobic 3. Bacterial inoculum 4. Algae inoculum 5. Nutrient addition 6. Incubation at half dark light cycle 7. Monitoring of Chl-a, TN, NO3, NO2, NH4 and DON What is DON Relevance Objectives Meth. & Results Further research
  • 10. IV. Methodology and results 2) Bioavailability tests: Chl-a development Chl-a development 600 Eff full nut 500 Eff full nut except NO3 Phi full nutChla conc (µg/L) 400 Phi no nut 300 200 HNP effluent with 100 addition of nutrients 0 except NO3 allowed 0 1 2 3 4 5 6 7 8 9 10 algal growing -100 Time (days) What is DON Relevance Objectives Meth. & Results Further research
  • 11. V. Further research- Quantification of DON bioavailability- Relation between DON concentration profile and backwash phase- How to remove DONWhat is DON Relevance Objectives Meth. & Results Further research
  • 12. websitewww.delftbluewater.nl

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