AQUAPONIC SLUDGE DIGESTION FOR ORGANIC REDUCTION … · Aerobic vs Anaerobic sludge digestion in...
Transcript of AQUAPONIC SLUDGE DIGESTION FOR ORGANIC REDUCTION … · Aerobic vs Anaerobic sludge digestion in...
AQUAPONIC SLUDGE DIGESTION FOR ORGANIC REDUCTION AND NUTRIENTS MINERALISATION IN UASB REACTORS
by Boris Delaide
Work in collaboration with: Simon Goddek, Karel Keesman and M. Haissam Jijakli.
Integrated and Urban Plant Pathology Laboratory
One loop aquaponics
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Fish tank SumpBiofilter PumpHydroponic beds
Mechanical filter
Low concentration of mineral elements in solution
- Macroelements:
N, P, K, Ca, Mg, S
- Microelements:
Fe, B, Cu, Zn, Mn, Mo
Fish tank SumpBiofilter PumpHydroponic beds
Mechanical filter
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Nutrients lost by sludge spillage
Sludge
Fish tank SumpBiofilter PumpHydroponic beds
Mechanical filter
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Sludge digestion for mineral elements recovery
Digestionin
bioreactor
Sludge
Fish tank SumpBiofilter Pump Hydroponic bedsMechanical filter
Macro and microelements
mineralised
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Formula used for COD – TS reduction:
Digester
𝑇𝑆 = 1 −∆𝑇𝑆 + 𝑇𝑇𝑆 𝑜𝑢𝑡
𝑇𝑇𝑆 𝑖𝑛
𝑻𝑻𝑺 𝒐𝒖𝒕𝑻𝑻𝑺 𝒊𝒏 ∆𝑻𝑺
where ∆𝑇𝑆 is the TS inside the reactor at the end of the experiment minus the TS inside the reactor at the beginning of the experiment, 𝑇𝑇𝑆 𝑜𝑢𝑡 is the total TS outflow and 𝑇𝑇𝑆 𝑖𝑛 is the total TS inflow.
Introduction Formula Aerobic vs
AnaerobicUASB
performancesUASB effluents Perspectives
Formula used for elements mineralisation:
Where 𝑁𝑅 is the nutrient recovery at the end of the experiment in percent, 𝐷𝑁𝑜𝑢𝑡is the total mass of dissolved nutrient in the outflow, 𝐷𝑁𝑖𝑛 the total mass of dissolved nutrient in the inflow , and 𝑇𝑁𝑖𝑛 the total mass of dissolved plus undissolved nutrients in the inflow.
DigesterDNout
DNin
+
TNin
UNin
𝑁𝑅 =𝐷𝑁𝑜𝑢𝑡 −𝐷𝑁𝑖𝑛𝑇𝑁𝑖𝑛 − 𝐷𝑁𝑖𝑛
Introduction Formula Aerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Aerobic vs Anaerobic sludge digestion in simple reactors
ZHAW1, ULg2 and WUR3
1 ZHAW Life Sciences und Facility Management, Grüentalstrasse 14, Postfach, 8820 Wädenswil2 Integrated and Urban Plant Pathology Laboratory, Université de Liège, Avenue Maréchal Juin 13, 5030 Gembloux, Belgium3Wageningen University, Wageningen Institute of Animal Sciences, Aquaculture and Fisheries Group, P.O. Box 338, 6700 AH Wageningen, The Netherlands
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Anaerobic vs Aerobic sludge digestion in simple reactors
a
a
a
a
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Anaerobic vs Aerobic elements mineralisation performances
a
b*
a a
aa
a a
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
UASBEGSB
ULg: one setWUR: two sets
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
pH in reactors
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
VFA in reactors
Introduction
FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
Sludge organic reduction performances
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
Sludge reduction and mineralisation performances
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
• N mineralisation: protein degradation
NH4+
• P, K, Ca, Mg mineralisation: solubilisation low pH of precipitated minerals
- Struvite: (NH4)Mg(PO4) 6(H2O)- Calcium phosphate, Hydroxyapatite: Ca5(PO4)3(OH)
Introduction
FormulaAerobic vs Anaerobic
UASB performances
UASB effluents
Perspectives
TS and COD in effluents comparison
Introduction
FormulaAerobic vs Anaerobic
UASB performances UASB effluents Perspectives
Macroelements in UASB effluents compared to hydroponics
Introduction FormulaAerobic vs Anaerobic
UASB performances UASB effluents Perspectives
Microelements in UASB effluents compared to hydroponics
Introduction FormulaAerobic vs Anaerobic
UASB performances UASB effluents Perspectives
Two-step digestion + post-treatment?
UASB➢ pH 6.5 – 7.5➢ Organic
reduction ➢ N mineralisation➢ Biogas
Acid reactor
➢ pH 4.5 to 5.5➢ Macro and
microelements mineralisation
Freshsludge
Post-treatment
?
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
RAS
HydroponicsUASB +
Sludge mineralisation
Decoupled AquaPonic System: DAPS
Introduction FormulaAerobic vs Anaerobic
UASB performances
UASB effluents Perspectives
Thank you for your attention!