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The conversion of ammonium and nitrate on the growth of the two duckweed —— Lemna perpusilla and Spirodela oligorrhiza Name: Wu Xuefei Major: Environmental Science

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Choose Duckweed Why? High removal rate of nitrogen Animal food Rich in protein Growing rapidly Harvest conveniently

Experimental Considerations ,[object Object],[object Object],[object Object]

[object Object],Footnote: NH 4 + ： NH 4 Cl NO 3 - ： KNO 3 nutrients Concentration (mg/L) NH 4 NO 3 20 CaCO 3 15 MgSO 4 • 7H 2 O 50 K 2 PO 4 40 H 3 BO 3 1.0 MnSO 4 • H 2 O 1.54 ZnSO 4 • 7H 2 O 6.59 Na 2 MoO 4 • 2H 2 O 2.52 CuSO 4 • 5H 2 O 0.39 CoSO 4 • 7H 2 O 0.09 FeSO 4 • 7H 2 O 25 Na 2 EDTA 5

0.05mmol/L N n NH4+ ： n NO3- 1 5:0 2 4:1 3 3:2 4 2:3 5 1:4 6 0:5 1.0mmol/L N n NH4+ ： n NO3- 7 5:0 8 4:1 9 3:2 10 2:3 11 1:4 12 0:5 5mmol/L N n NH4+ ： n NO3- 13 5:0 14 4:1 15 3:2 16 2:3 17 1:4 18 0:5

[object Object],100% NO 3 - — N 80% NO 3 - — N 20% NH 4 + — N 60% NO 3 - — N 40% NH 4 + — N 40% NO 3 - — N 60% NH 4 + — N 20% NO 3 - — N 80% NH 4 + — N 100% NH 4 + — N Every three days

If the experiment is successful, we can certainly raise the capacity that duckweed removes the ammonium in wastewater. Expected result

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