sustainable waste management by an integrated solid waste treatment plant in friesland, the...
TRANSCRIPT
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
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.