INTEGRATED SYSTEM FOR THE TREATMENT OF MUNICIPAL

WASTEWATER AND BIODEGRADABLE SOLID WASTE

Dr. Malamis Dimitris

National Technical University of AthensSchool of Chemical EngineeringUnit of Environmental Science and Technology

“Water Resources Management: Needs and Prospects”

Jordan, Amman, 22/04/2013

INTERWASTE ProjectINTERWASTE is co-funded by EU LIFE+ ENVIRONMENTINTERWASTE Partners

National Technical University of Athens (Greece)Cyprus University of TechnologyUniversity of Nicosia (Cyprus) Proplan Ltd (Cyprus) Department of Environment Ministry of Agriculture, natural

Recourses and Environment .

Aim of present workDevelopment of an integrated system for sustainable

treatment of Biodegradable Organic Waste and Municipal Wastewater with zero discharge

Production of high quality, added value productsElectricity and heat from renewable sources (organic

waste)High quality effluent that can be reused (i.e. irrigation)High quality soil conditioner-compost

This can be achieved through the integration of aerobic and anaerobic processes by employing:

Membrane BioReactor-Anaerobic Digester

MBR - AD

Potential users of the integrated MBR-AD system

Generally places where production of waste and demand of the obtained products from waste treatment co-exist:

Remote de-centralized regions

Small communities

Residential areas (i.e. blocks of flats)

Hotels

MBR

AD

BIOGAS

Digestate

Flow Sheet diagram MBR - AD

The integrated system The MBR – AD Unit

Operating parametersMBR

1,5 m3/d municipal wastewatersludge outlet– 100 l/d => to AD

ADDaily preparation of substrate. Formation of a

mixture of 150L with 10% TS consisting of food waste and sludge from the MBR

150 L of digestate are separated into liquid and solid phase Solid phase => solar drier Liquid phase => recirculated to the MBR

MBR

Flow Sheet diagram MBR - AD

MBR – BUFFER TANK

Stainless steal vessel 8,5 m3

MBR

Flow Sheet diagram MBR - AD

MBR

Feedstock Municipal Wastewater from Buffer Tank

(1,5 m3/d)

Membrane BioReactor (MBR) system for

wastewater treatment

Effluent (water)

Sludge

Sludge fed to the Anaerobic Digestion System

AD

Flow Sheet diagram MBR - AD

Homogenization Unit – AD Substrate preparation

Homogenization Unit: • Sludge from the MBR• Food waste• Target 10±2% TS

AD

Flow Sheet diagram MBR - AD

Anaerobic Digester

Substrate from the Homogenization

Unit

Digestate

Biogas

Total volume 8,5 m3

Operating volume 4,5 m3

Substrate feed

150 L/d with 10 % TS

Mesophilic Temperature (≈35oC)

SRT = 20-25days

AD – Biogas SystemBiogas Storage

(Balloon 3m3)

Biogas Meter Scrubber for biogas cleaning (VOC, ΝΗ3)

Packed bed Scrubber

(H2S)

Biogas Composition

Analysis

CHP unit

Biogas Cleaning System

Scrubbers for biogas cleaning

CHP unit for energy

production

Digestate

Flow Sheet diagram MBR - AD

Bag Filter – Treatment of Digestate

180 200 220 240 260 280 300 320 340 360 38070%

75%

80%

85%

90%

95%

100%

Start up1 ec-MBR 2 ec-MBR3 ec-MBR

Days of operation

% C

OD

rem

ova

l

ΜΒR performance % COD reduction

180 200 220 240 260 280 300 320 340 360 38070%

75%

80%

85%

90%

95%

100%

Start up1 ec-MBR 2 ec-MBR3 ec-MBR

Days of operation

% T

N r

em

ova

l

ΜΒR Performance TN reduction

180 200 220 240 260 280 300 320 340 360 38070%

75%

80%

85%

90%

95%

100%

Start up1 ec-MBR 2 ec-MBR3 ec-MBR

Days of operation

% N

H4

rem

ova

lΜΒR Performance - NH4

+ reduction

Biogas Composition CH4 = 59%, CO2= 40 %

100 150 200 250 300 350 4000

2

4

6

8

10

12

14

1 ec-AD2 ec-AD3 ec-AD4 ec-AD

Days of operation

Bio

gas

Pro

du

cti

on

(m

3/d

)

AD Performance – Biogas Production

Biogas - Energy Balance

Electricity

Biogas

100%

Heat

33%

3.5 %

22%

31.5%

55%

35%

losses

10%

MBR-AD potential applicationsTreating Biowaste & Municipal wastewater of a

community with population of 1,000 persons in Cypruscovers the electricity needs of around 55 inhabitants or 19

households Produces 150 m3/d of water that can be used for irrigation

Treating Biowaste & Municipal wastewater of a 5 star Hotel in Cypruscovers 3.4% of the needs for electricity and covers 3.6% of the heating needs Produces 250 m3/d water that can be used for irrigation

THANK YOU FOR YOUR ATTENTION

Dr. Dimitris Malamis

National Technical University of AthensSchool of Chemical EngineeringUnit of Environmental Science and Technologydmalamis@chemeneng.ntua.grwww.uest.grTel: 2107723108Fax: 2107723285