07b reclamation of treated urban water
DESCRIPTION
Presentation Diana Norton Brandãoon Dissolved organic nitrogenTRANSCRIPT
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Reclamation of treated urban water
Dissolved organic nitrogen
Diana Norton Brandão
Promotor: Jules van LierCo-supervision: Sigrid Scherrenberg
29th May 2012
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Contents
I. What is DON?
II. Relevance
III. Research objectives
IV. Methodology and results
V. Further research
What is DON Relevance Objectives Meth. & Results Further research
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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 agents
What is DON Relevance Objectives Meth. & Results Further research
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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 much stronger carcinogenicity than that of regulated DBPs
- Little knowledge about DON
What is DON Relevance Objectives Meth. & Results Further research
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III. Research objectives
- Understand DON occurrence and composition in wastewater
- Determine DON bioavailability
What is DON Relevance Objectives Meth. & Results Further research
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IV. Methodology and results
1) DON along tertiary filtration
DON Phobic
DON Philic
Persulfate digestion
Ion cromatography
HL
XAD treatment
Collection, filtration
What is DON Relevance Objectives Meth. & Results Further research
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6 sampling points, fractionation in Phi and Pho
SBBR filtration removes DON
SamplesP1 - HF 3,68P1 - HB 0,75P2 - HF 2,78P2 - HB 0,31P3 - HF 3,20P3 - HB 0,29P4 - HF 1,93P4 - HB 0,46P5 - HF 1,32P5 - HB 0,09P6 - HF 0,96P6 - HB 0,20
DON
1,16
4,42
3,09
3,50
2,39
1,41
IV. Methodology and results
1) DON along tertiary filtration
What is DON Relevance Objectives Meth. & Results Further research
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IV. Methodology and results
2) 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
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IV. Methodology and results
2) Bioavailability tests: preparation
What is DON Relevance Objectives Meth. & Results Further research
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
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IV. Methodology and results
2) Bioavailability tests: Chl-a development
Chl-a development
-100
0
100
200
300
400
500
600
0 1 2 3 4 5 6 7 8 9 10
Time (days)
Ch
la c
on
c (
µg
/L)
Eff full nutEff full nut except NO3Phi full nutPhi no nut
HNP effluent with addition of nutrients except NO3 allowed algal growing
What is DON Relevance Objectives Meth. & Results Further research
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V. Further research
- Quantification of DON bioavailability
- Relation between DON concentration profile and backwash phase
- How to remove DON
What is DON Relevance Objectives Meth. & Results Further research
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