AQUAPONIC SLUDGE DIGESTION FOR ORGANIC REDUCTION AND NUTRIENT REMINERALIZATION IN UASB REACTOR.

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.

One loop aquaponics

Introduction

Anaerobic

UASB

performances UASB effluents Perspectives

Fish tank _{Biofilter Sump Pump}

Hydroponic beds Mechanical

Low concentration of mineral elements in solution - Macroelements: N, P, K, Ca, Mg, S - Microelements: Fe, B, Cu, Zn, Mn, Mo

Fish tank _{Biofilter Sump Pump}

Hydroponic beds Mechanical

filter

Introduction

Anaerobic

UASB

Nutrients lost by sludge spillage

Sludge

Fish tank _{Biofilter Sump Pump}

Hydroponic beds Mechanical

filter

Introduction

Anaerobic

UASB

Sludge digestion for mineral elements recovery

Digestion in bioreactor

Sludge

Fish tank Mechanical _{Biofilter Sump Pump Hydroponic beds}

filter

Macro and microelements

mineralised

Introduction

Anaerobic

UASB

Formula used for COD – TS reduction:

Digester

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, 𝑇_{𝑇𝑆 𝑜𝑢𝑡} is the total TS outflow and 𝑇_{𝑇𝑆 𝑖𝑛} is the total TS inflow. Introductio n

Formula

Formula used for elements mineralisation:

Where 𝑁𝑅 is the nutrient recovery at the end of the experiment in percent, 𝐷𝑁_𝑜𝑢𝑡is the total mass of dissolved nutrient in the outflow, 𝐷𝑁_𝑖𝑛 the total mass of dissolved nutrient in the inflow , and 𝑇𝑁_𝑖𝑛 the total mass of dissolved plus undissolved nutrients in the inflow.

Digester

Aerobic vs Anaerobic sludge digestion in simple reactors

ZHAW

_{, ULg}

_{and WUR}

1_{ZHAW Life Sciences und Facility Management, Grüentalstrasse 14, Postfach, 8820 Wädenswil}

2_{Integrated and Urban Plant Pathology Laboratory, Université de Liège, Avenue Maréchal Juin 13, 5030}

Gembloux, Belgium

3_{Wageningen University, Wageningen Institute of Animal Sciences, Aquaculture and Fisheries Group, P.O. Box}

338, 6700 AH Wageningen, The Netherlands

Introduction Formula

Aerobic vs

Anaerobic

UASB

Anaerobic vs Aerobic sludge digestion in simple reactors

a

a a

a

Introduction Formula

Aerobic vs

Anaerobic

UASB

Anaerobic vs Aerobic elements mineralisation performances a b * a a a a a a

Introduction Formula

Aerobic vs

Anaerobic

UASB

UASB

EGSB

ULg: one set

WUR: two sets

Introduction Formula Aerobic vs Anaerobic

UASB

performances

UASB

pH in reactors

Introduction Formula Aerobic vs Anaerobic

UASB

performances

UASB

VFA in reactors Introductio n Formula Aerobic vs Anaerobic

UASB

performances

Sludge organic reduction performances

Introduction Formula Aerobic vs Anaerobic

UASB

performances

UASB

Sludge reduction and mineralisation performances

Introduction Formula Aerobic vs Anaerobic

UASB

performances

UASB

• N mineralisation: protein degradation

NH

₄

+

• P, K, Ca, Mg mineralisation: solubilisation low pH of precipitated minerals

- Struvite: (NH

)Mg(PO

) 6(H

O)

- Calcium phosphate, Hydroxyapatite: Ca

(PO

)

(OH)

Introducti on Formula Aerobic vs Anaerobic

UASB

performances

TS and COD in effluents comparison Introducti on Formula Aerobic vs Anaerobic UASB

Macroelements in UASB effluents compared to hydroponics

Introduction Formula Aerobic vs Anaerobic

UASB

Microelements in UASB effluents compared to hydroponics

Introduction Formula Aerobic vs Anaerobic

UASB

Two-step digestion + post-treatment?

UASB

Acid

reactor

Fresh

sludge

Post-treatment

?

Introduction Formula Aerobic vs Anaerobic

UASB

RAS

Hydroponics

UASB +

Sludge mineralisation

Decoupled AquaPonic System: DAPS

Introduction Formula Aerobic vs Anaerobic

UASB