Turning Food and Animal

Waste to Energy The future to Renewables & Distributed Generation

By: Edwin Khew

MD Anaergia Pte Ltd

Key Issues Of The 21st Century

Anaergia Overview

3

• Global technology leader in the recovery of value from organic waste streams

• Complete solutions for resource recovery from waste, specially organics to energy through anaerobic digestion and nutrient recovery

• Proven portfolio of proprietary technological solutions around anaerobic digestion core

• Flexible project delivery options, including DB, BOO, DBO

• Over 20 years of design and operating experience

• Core technologies used in over 1,600 digester plants with over 355 MW of capacity from biogas

ECONOMICAL PROVEN DISTRIBUTED

“ WASTE TO ENERGY IS

BIG BUSINESS Investment in biomass and waste-to-energy is projected to increase from $14bn in 2010 to $80bn by 2020” – Bloomberg New Energy Finance

”

Economic and Environmental Driver

• Biogas is a valuable energy source – Replace natural gas or Upgrade to natural gas

– Electrical power generation (renewable energy 24x7)

• Difficulty of disposing food waste and animal waste materials – Feeding food waste to animals outlawed by WHO

– High cost of transportation of “wet waste” materials to landfills

– Spreading liquid compost or animal waste as Agri fertilzer outlawed by EPA.

• “Green” approach to business to meet national or global environmental goals

• Organics outlawed in landfills in Europe, US and China to mitigate green house gas emissions and leachate contamination. Reduction as incineration materials-lowers NCV and efficiency of combustion

Our Vision: Zero Organic Waste Future

Integrated Solutions Food Processing Waste

Municipal Solid Waste

Source Separated Organics

Wastewater Biosolids

Clean

Water

Organic

Fertilizer

Renewable Gas

Renewable Power

Agricultural Waste

Recyclables

Anaergia has a global footprint with

Asian HQ in Singapore

Food Waste Treatment Technology

Food Waste SSO / C&I

Liquid Waste / FOG Liquid

Storage

Bunker with screw augers or walking

floor

Liquid Waste

OREX – Pre-Treatment System

Plastic & Packaging Raw Slurry

Clean Slurry

Small Plastics &

Paper

Optional Dynamic

Cyclone / Settler For Treatment of High Contamination Waste

Grit & Glass

Anaergia Triton TM High Solids Digester

Biogas treatment

Digestate Screw Press

Screw Dewater

Polymer Filtrate

Cake to Composting

or land application

Filtrate to Treatment

Filtrate return for Pre-Treatment Use

Filtrate for dilution

CHP

Upgrading to Biomethane

Heat to Heat to digesters and drying (if available)

Electricity

Heat

RNG to pipe or vehicle fuel

Wash Water Injection

Food Waste Pre-Treatment

Reference: Food Waste

Reference: Food Waste, Glenfarg

Reference: Food Waste

Reference: Food Waste

Reference: Food Waste and

Agricultural Waste Co-Digestion

Animal Waste Process Flow Diagram

Food Waste

Manure Anaerobic

Digestion

Dewatering

Ammonia

Stripping Acid Scrubbing Heat Exchanger

Fertilizer

Combined Heat and

Power Unit

Biogas

Waste Heat

Deammonified Dilution Water

Electricity

Sludge

Recovering Resources from Digestate

Start with raw digestate 2% - 15% TS depending on feedstock and digester type 1) Use Solid/Liquid separation to recover

organic N & P in the cake

2) The liquid fraction (filtrate) will contain inorganic N & soluble K and P

3) Use ammonia stripping to recover ammonia from the filtrate either as liquid or pellet ammonium sulfate

4) Deammonified filtrate contains residual ammonia and P and can be used to produce Struvite pellets adding Mg

5) Deammonified filtrate contains org-N, P and K and can be concentrated, dried and pelletized combined with digestate cake

Ammonia Stripping

17

Applications

• Production of deammonified filtrate for use in feedstock dilution.

• Production of nitrogen fertilizer from digestate

• Reducing nitrogen load for land application of digestate

• Controlling ammonia toxicity in digestion of high solids substrates

Case Study – 40 TPD Chicken Farm

Solution • Liquefy manure with deammonified

filtrate

• 500 kW electricity + 425 kW heat using CHP

• Solid-liquid separation using a two stage screw press

• Filtrate treated using air stripping and ammonium sulfate production

• 3,800 lbs/d dry ammonium sulfate (800 lbs/d of nitrogen) equivalent

• Estimated $210,000/year in fertilizer value

• Additional 30 ton/d of 25% cake solids (N-P-K of 1.7-1.6-0.4)

Triton™ Digester System

• Preferred design for large plants > 1 MWel

• Tank in tank arrangement, Combines raceway and CSTR reactors

• Outer ring: 1st Stage high rate, higher solids

• Inner ring: 2nd Stage low rate, lower solids

• 30% Lower mixing energy required for high solids 1st Stage

• Compact construction with 30% less footprint and Short piping lengths

• Low parasitic energy consumption and Low heat losses

Inner Ring with Double Membrane Cover Outer Ring with Concrete Roof

2nd Stage

1st Stage

Triton™ vs. Conventional Technology

Digestion Technology - Hydraulic Mixers

and Service Box

Digestion Technology – Pumping and

Separation

Q&A

June 14 23

Thank You !