BIOWATT ENGINEERINGBIOWATT PURDIE BIOREACTORPresentation to Aqua Enviro Inlet Works Event30th April 2015

BioWatt

Group

Purdie Bio Ltd

BioWatt Engineering

Ltd

BioWatt Developments

Ltd

Green Composting Co.

Purdie Bio LtdBioWatt

Engineering Ltd

ZWD

The BioWatt Group of Companies

BioWatt Engineering Offering

• Concept and General Design • Detailed Engineering Specification and Design• Full CAD/ 3D Design Capability• Full/ Part Planning Permission Service

Design

Build

• Full EPC Contracting Package • Provision of Technology/ Process Work Packages• CDM Principal Contractor/ Co-ordinator• Programme/ Project/ Interface Management

Technology

• Treatment Solutions based on Biological Processes• Bioremediation/ Bio-drying/ “Difficult” Materials• Development from concept of Novel Treatment Solutions• Pilot Trials/ Commercialisation/ Scalability

ORGANICS PROCESSING Offerings

BioWatt Engineering

• Two Main Offerings:

Purdie Agitated Continuous Flow BioReactor

MIDAS Tunnel In Vessel Composting

• Focussed on “Difficult to Process” Materials:

Sewage Grits, Screenings and Sewer Washings

Oil Based Mud (OBM) and Drill Cuttings from Oil and Gas

Fish Farming and Aquaculture Wastes

Absorbent Hygiene Products

Zoo Poo

Engineered IVC

ORGANICS PROCESSING Offerings

BioWatt Engineering Engineered IVC

IN VESSEL COMPOSTING – The basics

• Composting - a naturally occurring process in the presence of oxygen and water

• Biological processes - regulated by natural “environmentally limiting factors”

• ELFs - include insufficient oxygen, water, substrate, temperature

• Remove ELFs in a controlled engineered environment - biological population “explode” exponentially

• Massive growth in the biological population - Processes happen in days rather than months

• Tunnel Composting Design & Build

– Application - Aerated floor in-tunnel composting facilities – IP/ know-how resides with BioWatt

– Marsham IVC in operation

– Completing Wakefield PFI Project with Shanks

• PURDIE ® Plug Flow In-Vessel Bioreactor Design & Build

– Most aggressive and effective composting technology – Can deal with “difficult” hi-odour & hi-pathogen waste materials.

– UK designed and built technology

– Mark I operating in Kent

– Mark II designed

BioWatt Engineering Products & Services

BioWatt Engineering Clients

Grits & Screenings

PURDIE BIOREACTOR Grit and Screenings Processing

BioWatt Engineering Engineered IVC

INPUT MATERIALS

GRITS

SCREENINGS

SEWER WASHINGS

Screenings:• Long and raggy in appearance • Issue - can wrap around moving parts• Need to be macerated at the works • >80% organic material

Grits:• Smaller particles • No shredding • Added to the process directly• > 60% organic material

General Qualities/ Issues:

• Highly odorous• High pathogen count• High moisture content• High bulk density• High cost of disposal ( >£100/t)

Site Clearance

Wood wastes

WASTESUnstable material with high O2 demand – Biohazard - Odorous

O2

Air introduced through turning -Forced air injection

PRODUCTStabilised material – Contains little readily biodegradable Carbon

Low odour - Low O2 demand - Low pathogens

H2O

CO2

Heat

CH2O etc

BioWatt Engineering Engineered IVC Grits & Screenings

PURDIE BIOREACTOR Biology

Length 10.0m (excl. motor gearbox)

Width 4.0m

Height 2.5m

Capacity Up to 6000kgs per day (14 cubic meters @ 0.5BD)

Motor 2 x 9kW Main Drive

Power 2 x 3ph 415v 50 Amp

Power Use 500 kWh per week

Temperature 8 Channel

Options Biofiltration, pre-shredder, loading hopper, conveying systems for stockpiling, end product screening

PURDIE BIOREACTOR Principle of Operation & Dimensions

BioWatt Engineering Engineered IVC Grits & Screenings

Material from Centre Outward

Blend material into centre

PURDIE BIOREACTOR Installation and Operation

BioWatt Engineering Engineered IVC Grits & Screenings

INSTALLATION:

• Unit designed to fit on the back of a self off-load vehicle [wide load]

• Quick and easy to install [ plug and play ]• Easily moved at a later date• High residual value

OPERATION:

• Unit is controlled by programmable PLC• Touch screen HMI screen • Connectivity allows access via the internet• Unit is on weigh cells allowing accurate feeding• Auto cut-outs with built in protection

Grits & Screenings

PURDIE BIOREACTOR – Process Flow

BioWatt Engineering Engineered IVC

Process Flow

Delivery of materials to site

Preparation of material for treatment.Un-macerated screenings require

shredding to avoid wrapping problems

PURDIE

Blending with “amending” material

and additives

Material spends up to 8-10 days in Bioreactor. Material is turned up to 250

times to maximise/ evenly distribute the composting process

Treated material is free of nuisance odour and is stored for up to two

weeks

Finished material can be screened and

sent for land remediation or

biomass fuel

BioWatt Engineering Engineered IVC Grits & Screenings

Process Flow

5 tonnes of input material drains on the

reception floor to 4 tonnes

PURDIE

5 – 6 tonnes per day of “total feed” is dose-fed from the

hopper over a 24 hour period –on an hourly basis

40-60% mass reduction occurs:

2 tpd productdischarged

c. 15% (by weight) of the finished product is “oversize” – the woody

fraction can be recirculated

4 tonnes of input material is blended with 1.5 tonnes of

woody wastes5.5 tonnes of “total feed”

PURDIE BIOREACTOR Mass Balance

BioWatt Engineering Engineered IVC Grits & Screenings

Comparison of Input and Output Characteristics

INPUT PRODUCT

Tonnes per Day 5-6 2-3

Cost -£100-120/ t [landfill] -£15-35/t [restoration]

DM Content 40-45% 80-95%

Bulk Density 500 kg/m3 750 kg/m3

Calorific Value < 5MJ/kg >10MJ/kg

pH 5-6 7-8

e. Coli 107 – 108 <100

Salmonella present nil

PURDIE BIOREACTOR Product ~ Properties and Values

Options

BIOMASS

Gasification

Pyrolysis

Combustion

Reviewed on next slide

BROWN FIELD REMEDIATION

Utilising the nutrient value of the material

Currently being utilised

LAND FILL Mass over landfill weighbridge is reduced by up to 60% through the PURDIE

The last resort

BioWatt Engineering Engineered IVC Grits & Screenings

PRODUCT Uses and Disposal

Options

ATT – gasification • 2 x ROCs on organic fraction• Syngas produced combusted in CHP• 250kW CHP per 2,000 tpa• Medium Technology Risk

Reviewing options from:• Intervate• Wehrle• Jag Energy

ATT – Pyrolyser • 2 x ROCs on organic fraction• Syngas produced, combusted in CHP• Synoil can be combusted• Biochar – possible biomass fuel/ fertiliser• 250kW CHP per 2,000 tpa• High Technology Risk

Reviewing options from:• Aston University• Umsicht Fraunhofer

Standard Combustion

• 1.5 x ROCs – input must be >90% organic by CV

• Produces heat through boiler• Waste exhaust heat can be converted to

electric by ORC• Low Technology Risk – requires heat user

to be viable

Reviewing options from:• Kohlbach LTHW Boilers

for wet Biomass

BioWatt Engineering Engineered IVC Grits & Screenings

PRODUCT Biomass Options

BIOWATT PURDIE BIOREACTOR SUMMARY

BioWatt Engineering Engineered IVC Effective Composting

Faster, Effective Processing of ‘Difficult’ Wastes High Pathogen Kill > 1010

101

Control of Emissions ~ No Leachate ~ Biofilter Exhaust

Small Footprint Some 35% w/w Woody Amendment Required Processing cost in the order of £15/t + debt servicing Design Capacity 6t/d mixed feed Delivered Price > £400k ~ Plus Client Costs