07b reclamation of treated urban water
DESCRIPTION
Presentation Diana Norton Brandãoon Dissolved organic nitrogenTRANSCRIPT
Reclamation of treated urban water
Dissolved organic nitrogen
Diana Norton Brandão
Promotor: Jules van LierCo-supervision: Sigrid Scherrenberg
29th May 2012
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
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
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
III. Research objectives
- Understand DON occurrence and composition in wastewater
- Determine DON bioavailability
What is DON Relevance Objectives Meth. & Results Further research
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
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
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
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
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
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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