CONSULTANCY SERVICES WITHIN AD AND BIOGAS

Anaerobic Digestion (AD) of organic waste to produce biogas presents many benefits principally generating a flexible renewable fuel thus reducing greenhouse gas emissions and returning nutrients from waste material as agricultural fertiliser. Other benefits include minimizing odour problems from handling and use of manure as fertiliser on agricultural land; minimizing leaking of Nitrogen (N) and Phosphorus (P) from agricultural land; decomposition of pathogens and weed seeds in the manure; promoting local employment; and developing the local economy. Ramboll offers a full range of services for AD, biogas upgrade, gas to grid and vehicle fuel projects from planning and project development, to design, implementation and follow-up on operation and maintenance. Project feasibility The feasibility study is a broad overview of the project requirements. We identify appropriate sources and predicted volumes and seasonality of digestate. We calculate the nutrient loading and predict biogas yield. We assess the area required for the plant and identify utility constraints or service supplies needed for the development. We determine options for gas use. And we estimate the cost (investment, O&M and life cycle cost) and potential income from the plant. Detailed design The design should outline and test the combination of technologies that are best suited for any particular project. The optimal performance of the plant in terms of energy generation has to be balanced with its performance and compliance with environmental permits and licences.

Environmental impacts We assess planning, environ-mental and permitting issues associated with the proposed development. As part of the appraisal Ramboll will review site constraints, site history and undertake consul-tation with the relevant authorities and public bodies. Procurement process The objective of the procurement process is to ensure value for money through a high-quality contract with a reputable bidder at a competitive price. In this phase, we short list the suppliers of mechanical and electrical equipment and civil works contractors in a prequalification procedure, we prepare tender documents and we conduct a professional procurement process. Supervision of design and construction The overall objective of this phase is to ensure that the supplier fulfils the requirements of the contract. In other words, we safeguard our clients’ interests in relation to the supplier. In service Provisional takeover of the AD/ gas upgrade facility marks the beginning of the guarantee period, typically two years’ duration. In this period, we assist our clients in identifying and documenting defects and in making sure that the suppliers correct them.

Ramboll's services Once an AD plant has been decided, Ramboll typically provides support and advice as the owner's engineer throughout the development process on relevant technical, environmental and financial matters. Our clients include project developers, utilities and contractors, and our services include:

CONTACT Lars Erik Høgenhaven Larsen Head of department lehl@ramboll.com Phone +45 51618365

Selected project references • Maabjerg Bioenergy: Maabjerg Bioenergy Drift A/S, Denmark,

630,000 tonnes/year of manure and organic food waste generating 18.4Mm³ biogas/year

• Novozymes: Novozymes A/S, Denmark, 1.6Mm³/year waste sprit and formic acid from Novo Nordisk generating 7.2Mm³ biogas/year

• Cumnock WWTW: Scottish Water, UK, 67,000 tonnes/year of sewage sludge with codigestion of municipal waste generating 2.3Mm³ biogas/year

• Norrkiping: Norrkoping Municipality, Sweden, 20,000 tonnes/year of mixed waste

• Ha BioPark: Hå Biopark AS, Norway, 400,000 tonnes/year of municipal solid waste

Ramboll's geographical AD and biogas project experience

Outline design/feasibility • Feasibility studies • Due diligence • Risk assessment • Environmental impact

assessment • Budgeting and time

scheduling • Permitting

Basic design • Conceptual and tender

design for anaerobic digestion process and gas utilisation including CHP and biogas upgrading

• Civil and structural design for tanks, access, buildings, etc

Detailed design • Process and instrumentation

design • Civil and structural design • Project certification and

authority approval • Environmental permitting

and licensing • Procurement

Construction • Construction management

and supervision • Installation supervision

Test & commissioning • Acting on behalf of the

developer during testing, commissioning and handing over of the project

Post construction • Follow-up on O&M • Decommissioning

Why choose Ramboll for your AD and biogas project?

• Ramboll has worked in the energy sector with an international presence for many years and is recognised as world class

• Being part of a multi-disciplinary company represents complete services within the waste business and offering a single point of contact for the client

• Has a large technical resource combining considerable experience in both Anaerobic Digestion process as well as biogas handing and use including appraisals of all upgrade technologies and delivery to gas networks or as vehicle fuel

• National and international offices.

AD and biogas in Ramboll

Number of specialists: 30

Annual turnover: €1.5Million

Years of experience: 20

Financial ModelAvailable Feedstocks

Agricultural Waste

Municipal Waste

Commercial Waste

Energy Crops

Waste Capture

Plant Design/ Operation

Gate Fee

Digestate Use

Gas Yield/Usage

CAPEX

OPEX

Revenue

Sewage Sludge

What is biogas?

Biogas, CH4, is produced by use of anaerobic digestion of raw materials: manure, organic waste and energy crops. Sludge is digested in huge digestion tanks for several weeks at elevated temperatures with continuous rotation of the material.

The solid fraction of the digestate, rich in Nitrogen and Phosphorus, is filtered out and the sludge is delivered back to the farmers for use as fertiliser.

The biogas can be combusted in CHP engines or upgraded by removal of unwanted gases to concentrate the biomethane for delivery to the gas grid or as a vehicle fuel.