The document discusses methods for segregating waste to produce higher quality feedstock for anaerobic digestion. It notes that inorganics like glass, metals, and grit can cause wear on equipment and reduce biogas production. Huber Technology is experienced in liquid/solid separation and has applied this to challenges in anaerobic digestion plant design, including removing contaminants from feedstock. Physical removal of contaminants through processes like screening, grit removal, and washing of rejects can improve the performance of anaerobic digestion. The quality and amount of plastics and other rejects varies depending on pre-processing, and returning organics captured in washing can increase biogas yield.

1. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
FEEDSTOCK-
HOW TO SEGREGATE WASTE
MSW wasteFood and Vegetable Biomass
Kerbside and supermarket
Inorganics such as Glass, sand, metals, heavy plastics and grit
together with unwanted Organics like eggshells, and sea shells
cause abrasive wear and fill buffer tanks and digesters

2. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
Huber Expertise
Huber are Liquid / Solid Separation Engineers and have been able to
apply that knowledge to some of the challenges in the design of
Anaerobic Digestion:
Biowaste wet fermentation
Removal of Grit
Coarse Screening
Removal of floating debris
Removal of plastics
BOD removal
Dewatering AD Sludge
Polishing Spent Digestate
PHYSICAL REMOVAL OF CONTAMINANTS IS OUR
BUSINESS, SO WE ACCEPT THE CHALLENGE.

3. FEEDSTOCK –
SEPARATION AND
PRE-TREATMENT
#UKADBiogas
@adbioresources
PANEL:
TIJANA DURIC, BASF
TONY CLUTTEN, HUBER TECHNOLOGY
COLIN STEEL, WELTEC BIOPOWER

4. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
THE QUALITY AND QUANTITY OF PLASTICS REJECTS DEPENDS
ON THE DE-PACKAGING PROCESS AND FEEDSTOCK. WE HAVE
FIGURES VARYING FROM 7 TO 22% FROM SOURCE SEGREGATED
AND SUPERMARKET WASTE.
PULPERS, HAMMERMILLS, ATTRITORS ALL PRESENT A
DIFFERENT SOUP, SO WE TRIAL.
REJECT WASHING ON AD PLANT
TIGER
DEPACKAGING
WASHPRESS
UNDER
DISCHARGE
TIGER REJECT 7.5% WASHED AND DEWATERED ORGANICS RETURNED
OF FEED SCREENINGS TO SOUP 27%

5. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
REJECT WASHING
WASHPRESS
ON BTA
PULPER
TRIALS IN
BELGIUM AND
SPAIN

6. SCREENINGS WASHING-Swedish Plant
Wash Press in
Sweden working on
screenings from a
Huber screen after a
Hammer Mill.
Screenings before
washing
Screenings after
washing
The weight deduction to Landfill is 10-14% but this depends on the
upstream process. Return organics means increased gas yield and less
landfill.

7. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
Built in 1999 in Boden Germany
Huber were tasked with removing
the oversize from a 12%DS soup
from a Pulper (Monsal type) after
Pasteurisation. Plant takes Green
and food waste.
The screen is followed by a grit
trap removing 12TPD.
The design warrants heavy
duty construction and drives
and after 14 years the unit is
operating well removing
oversize from the soup at
~60 ̊C
Oversize removal

8. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
GRIT REMOVAL- SHANKS
Trials in Boden and on the Shanks
grit trap have looked at separating
the organics from the settled grit
Trial Grit
washer at
Shanks
Recovered organics less~40% Cleaned grit, bone, eggshell,
sea shell

9. HUBER TECHNOLOGY . www.huber.co.uk
ADBA Feedstock How to Segregate Waste 2nd July 2015 10.00 to 10.55
BLACK BAG WASTE
THE GRIT AND GLASS IN UNSEGREGATED BLACK BAG
WASTE IS EXCESSIVE AND WARRANTS ANOTHER STEP UP
IN DESIGN
Light fraction screen at
Bredbury Parkway
Heavy fraction classifier
under a BTA pulper.
Note dump valve feed.

10. FEEDSTOCK –
SEPARATION AND
PRE-TREATMENT
#UKADBiogas
@adbioresources
PANEL:
TIJANA DURIC, BASF
TONY CLUTTEN, HUBER TECHNOLOGY
COLIN STEEL, WELTEC BIOPOWER