Sustainable waste management by an integrated solid waste treatment plant in Friesland, the Netherlands

CONTENTS

Background information:Omrin (Afvalsturing Friesland)Overview data SBIProcess schemesAerial overview SBI-plant

Operational overview:Mass balancesOptimisation of the operationEvaluation costsEnvironmental evaluation

Conclusions

SOMETHING ABOUT OMRIN

• Regional waste management company in the north of the Netherlands.

• A limited company with 31 municipalities as shareholders.• Processes more than 450,000 tonnes per year, has a

turnover of € 100 million and more than 500 employees.

“WASTE IS QUITE SOMETHING”

Transforming all waste to re-usable materials. High environmental standards in public spaces. Transparent and customer-friendly. Market-conformable tariffs.

ORGANISATION

BUSINESS GROUP

Collection & Cleansing

(FM)

Activities:

• Waste collection

• Collection of waste fractions

• Street cleansing

• Road gritting

• Sewer management (cleansing)

• Pest and vermin control

• Second-hand shops

BUSINESS GROUP

Logistics

(AF)

Activities:

• Waste transfer

• (Bulk) transportation

• Vehicle maintenance

• Eco-centres

BUSINESS GROUP

Recycling & Raw Materials

(AF)

Activities:

• Separation and processing of domestic and industrial waste

• Processing of demolition and building waste, soil, dredging sludge and road sweepings

• Immobilisation

• Sorting of electrical appliances

• Final disposal of domestic and industrial waste

• Energy production

• Marketing of waste fractions

BUSINESS GROUP

Building & Demolition

(JOGB)

Activities:

• Building and demolition activities

• Recycling and useful application of building and demolition waste

• Transportation and maintenance

• Sale and purchase of gritty material

Communications Policy & Legal Matters

Finance, Planning & Control Projects department

Human Resources QualityMatters

ICT Secretariat

Office Services

Staff

Management

Omrin

Consultancy

(joint-venture)

OMRIN CONSULTANCY

• A company in formation.

• Co-operation between Omrin and two specialised contractors.

• Waste management chain from collection, transfer, transport, processing and final disposal.

• Feasibility studies, design, construction and implementation (commissioning and training).

OVERVIEW SBI

“SBI” = Scheidings- en Bewerkings Installatie(separation & processing plant)

Capacity: 220,000 tonnes per year household andcommercial waste

Personnel: 35 employees

Main parts: - Separation unit- Washing unit- Digestion unit

AERIAL OVERVIEW SBI

1 = waste storage

2 = separation unit

3 = washing unit

4 = digestion unit

5 = power plant

123

4

5

FLOWCHARTS SBI

1 = drumsieve 180 mm

2 = drumsieve 55 mm

3 = air clarifier

4 = magnetic separator

5 = eddy current separator

Paper/

plastic

1

2

Scrap

iron

3 4 3 4

Paper/

plastic

Scrap

iron

Scrap

iron

Non-ferrous

metals

RDF RDF

OFMSW

4 5

Separation unit

1 = mixing tanks

2 = reactors

3 = generator

4 = belt press1

2

Organic & sludge

Biogas

Digestion unit

4

3

Heat recovery

Electricity

Digestate

Effluent

1 = inert separator

2 = drumsieve

3 = shredder

4 = hydrocyclone

5 = sludge centrifuge

1 2

OFMSW

Sludge to digestion

Washing unit

4 5

3

Inerts Sand

Organic to digestion

MASS BALANCE

220,000 tonnes

100%

Paper/

plastics

16%

Ferro/

non-ferro

3%

RDF

40%

(OFMSW)

(41%)

Inert

6%

Water

suspension

20750

(9,4%)

Sand

5%

Residue

3%

(Organic)

(36%)

Biogas

6%

Effluent

14%

Digestate

16%

Separation unit Washing unit Digestion unit

OPTIMISATION OF THE TREATMENT PROCESS

Separation unit• Increasing availability from 60 to 80%

Washing unit• Improving removal of interfering materials• Increasing operating time• Improving quality coarse organic material

Digestion unit• Making the tanks accessible

REMOVAL OF THE ROOF OF THE DIGESTER

LOWERING THE EXCAVATOR INTOTHE DIGESTER

EVALUATION COSTS

Breakdown of investment costs

Integral cost price in relation to secondary fuel

€ -

€ 20,00

€ 40,00

€ 60,00

€ 80,00

€ 100,00

€ 120,00

Year

Inte

gral

cos

t pr

ice

Other € 40,10 € 40,10 € 40,10 € 40,10

RDF € 46,20 € 46,20 € 44,00 € 39,60

Paper/ plastics € 12,00 € 11,20 € 9,60 € 9,60

2003 2004-1 2004-2 2005

Separation unit € 9.0 millionWashing unit € 6.2 millionDigestion unit € 19.8 millionMiscellaneous (planning, design and infrastructure) € 3.0 millionTotal costs € 38.0 million

ENVIRONMENTAL EVALUATION

Nett production of electricity

Saving of Fossil fuel

Avoided CO2-

emission

(TJ /y) (TJ /y) (kton/y)Incinerator Residual MSW 552 1380 92

Ferrous metals recovery 0 0 9Total 552 1380 101

SBI (1) RDF 265 662 44Paper/ plastic, secondary fuel 272 680 46OFMSW Digestion 56 141 9Ferrous metals recovery 0 0 9Non-ferrous metals recovery 0 0 13Total 593 1484 121

SBI (2) RDF 278 696 47Paper/ Plastic , material reuse 0 0 108OFMSW Digestion 20 51 3Ferrous metals recovery 0 0 9Non-ferrous metals recovery 0 0 13Total 298 747 180

Plant type Material stream

CONCLUSIONS

• The SBI as integral concept, after optimisation, is a robust solution for waste treatment.

• It is competitive to incineration as far as investment (± € 170 tonne/capacity) and environmental impact are concerned.

• The SBI leads to ”zero final disposal”.

• With increasing (worldwide) energy costs, the cost of waste processing will decrease simultaneously.

“Waste is quite something”