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Jens Aamand - Managed Aquifer Recharge 29/06/2019

PI Rural Groundwater Quantity Management 1

1Geological Survey of Denmark and Greenland2Southern University of Science and Technology

Jens Aamand1

Urse Scheel Krüger1

Yunjie Ma2

1

Managed Aquifer Recharge

Antibiotic removal during riverbank filtration of reclaimed water

Yunjie Ma1, Jakub Modrzynski2, Urse Scheel Krüger2 Jens Aamand2, Yan Zheng1

1Southern University of Science and Technology, China2Geological Survey of Denmark and Greenland

May 20-24 2019, Madrid, Spain

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Riverbank Filtration

Maliva & Missimer (2012)

Reclaimed water/treated wastewater

3

Study area – Beijing, the North China Plain

70% is reclaimed wastewater! Sources: Beijing Institute of Geo-Environment Monitoring

4



�

Water quality

Class IIClass IIIClass IVClass V< Class V

GB3838-2002

Surface water quality Shallow aquifer water quality

Study area – Beijing, the North China Plain5

Target pollutants - Antibiotics• Antibiotics are often excreted unchanged into

wastewater

• Antibiotics are often persistent and toxic and are not eliminated at most wastewater treatment plants

• Even low concentrations can lead to antibiotic resistance (ng/L ~ μg/L) and spread antibiotic resistance genes

Angelos Microblog

Super Bacteria

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Aim• Evaluate the antibiotic removal process during riverbank filtration – Laboratory

batch tests with river sediment from the North China Plain

• Assess the effects of potential influencing factors (substrates, sediment types).

- Hypothesis 1: exogenous substrates promote the removal;

- Hypothesis 2: sediments with a higher microbial diversity/abundance have better removal performances.

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Metabolic strategy Co-metabolic strategy

Oxidized metabolites

Specific catabolic strains

Aspecific co-metabolic AOB or MOB

Heterotrophic bacteriaCO2, NH4

+, Cl-, H2O, …

Ammo

nia/m

etha

ne

mono

-oxy

gena

se

Cros

s fee

ding

CO2, NH4+, Cl-, H2O, …

Met

aboli

cpa

thwa

y

NH4+

CH4

NO2-

CO2

Metabolic or co-metabolic degradation8



Removal batch

Mineralisation batch

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(triplicate)

(triplicate)

(28 day)

(28 day)

Lab study - antibiotics removal batch9

Removal performance in different sedimentsSulfadiazine, Sulfamethoxazole�Sulfamethazine

Riverbed sediments

Sediments 1 3 5TOC 2.4% 3.4% 2.2%

Sediments 2 4 6TOC 4.2% 3.0% 1.7%

Riverbank sediments

Sulfadiazine

Sulfamethoxazole

Sulfamethazine

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Sulfamethoxazole - Transformation products

Riverbank sediments

Riverbed sediments

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Mineralisation methodology

Radioactivity counting

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1 mL sample of liquid supernatant

• 10 µg/l 14C-labelled sulfamethazine or 10 µg/l 14C-labelled sulfadiazine

• Oxygen saturated medium• River sediment

Batch study(triplicate)

AcidNaOH

Sample

14CO2

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Almost no mineralization (<1%), but good removal (>50%)

Mineralisation of 14C-sulfadiazine to 14CO213

Decreasing radioactivity in the non-mineralised faction in the acid solution → sorption?

Non-mineralisation fraction of C14-sulfadine14C in acidic samples

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Substrate effects on mineralisation

(A) Mineralised fraction (B) Non-mineralised fraction

No effect of substrate addition on antibiotic mineralisation to CO2

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Conclusions

• No mineralisation of the studied antibiotics were observed either in the riverbank or the riverbed sediments

• All antibiotics were degraded in all sediments, but degradation was most efficient in the Yangdi and Togou riverbeds and the Hehe riverbank sediments

• Deamination of sulfamethoxazole to desamino-sulfamethoxazole was the most important sulfamethoxazole transforming process

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Acknowledgement

National Key Research and Development Program of China (2016YFC0401404)

Rural Water and Food SecurityAn action supported by the European Union

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managed aquifer recharge - cewp files/groundwater june... · jens aamand -managed aquifer recharge...

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