Dr Smarajit Roy (Neat U Loo) 1

Technological Development from Biogas Plant to Anaerobic Digestion; Use of Logic Model to

Develop a Poly System Supply Chain Management

China Bio-Energy Technology & Investment Summit20th-21st May 2010

Dr. Smarajit Roy

Dr Smarajit Roy (Neat U Loo) 2

Aerobic Digestion

Biogas collection

SealInlet

Slurry

Biogas

Removable cover

Overflow tank

Outflow

Dr Smarajit Roy (Neat U Loo) 3

Anaerobic Digestion Process

Hydrolysis Acidogenesis Acetogenesis Methanogenesis

Carbohydrates

Fats

Proteins

Sugars

Fatty Acids

Amino Acids

Carbonic Acids & Alcehols

Hydrogen Carbon Dioxide

Ammonia

Hydrogen Acetic &

Carbon Dioxide

MethaneCarbon Dioxide

C6H12O6 → 3CO2 + 3CH4

Dr Smarajit Roy (Neat U Loo) 4

Anacis Island Wastewater Treatment Plant

Dr Smarajit Roy (Neat U Loo) 5

EEH (Steam) Energy Balance

stevebungay@monsal.co.uk,( 13th European Biosolids & Organic Resources Conference & Workshop.)

6

THERMAL HYDROLYSIS IMPACT ON POWER GENERATION

Dr Smarajit Roy (Neat U Loo)

Pasteurization DewateringTransport

Hydrolysis – breaks down large molecules to improve digestion

Dewatering Transport

Dr Smarajit Roy (Neat U Loo) 7

Enhanced Enzymic Hydrolysis

Dr Smarajit Roy (Neat U Loo) 8

Enhanced Enzymic Hydrolyis (Steam Heating) Flow Sheet

Dr Smarajit Roy (Neat U Loo) 9

Thermal Hydro

• Cambi’s Thermal Hydrolysis Plant (THP)

• Black & Veatch Contracting UK installed plant at Celtic Anglian Water (CAW)

Dr Smarajit Roy (Neat U Loo) 10

Cambi’s Largest Thermal Hydrolysis Plant

• £75M sludge treatment contract• Plant will process biosolids which can be applied to

land as fertilizer• Heat & Power Plant to generate up to 10 MegaWatts

of Electricity• UK has set target of 15% of energy supplied by the

national grid to come from renewable sources by 2020• Plant expected to handle around 91,000 tonnes of dry

solids per year• Digestion Plant will serve a population of 3M people

Dr Smarajit Roy (Neat U Loo) 11

Bran Sands, Tees Valley, England英国 , (44 MGD + 68 MGD imports)

• 36,000 tonnes DS/year

• Digester loading up to 6 kg VS/m3/ day

(2-3 x conventional digestion)

• 10-12% DS feed to digesters

• >60 % VS reduction

• 5.6 MW electricity generation

• >30% dry solids Class A cake

Courtesy of

Dr Smarajit Roy (Neat U Loo) 12

Cogeneration – Energy Balance, Example 热电联产—能量平衡举例

12,000 metric tons dry solids/year ， 80% volatile solids content.处理能力每年 12000 吨干重固体， VS% 为 80%

Bio

gas

沼气

- 4

114

kW

Bio

gas

to e

ngin

e39

70 k

W

Heat loss 热损失 * 544 kW

Electricity 产电1584 kW

Cooling water 冷却水

894 kW

Biogas to steam boiler 沼气供蒸汽锅炉 144 kW

Hot Water** 136 kW

Hot water to 热水HVAC 714 kW

Steam from exhaust 热尾气产蒸汽 948 kW

Thermal Hydrolysis热水解1032 kW

Hot water to 热水 HVAC 743 kW

Warm sludge 热污泥 489 kW

Dr Smarajit Roy (Neat U Loo) 13

WHY USE CAMBI THERMAL HYDROLYSIS?为什么采用水热解 THP技术

提高消化产率 提高能效和封闭消毒 提高沼气产量 高品质生物固体肥料

THP

消化

传

统消

化

14

“Neat U Loo” Process Flow

DYNAMIC HUB

Pool FundingPrivate Capital (Bio-technology

Industries) Major Stakeholder

Government’s ResourcesInternational Resources

(UNO/World Water Authority/Charities)

Users’ involvementUsers are stakeholders Education & Training (Service User gets paid)

- Stop funding that does not work

- Stop planning flush toilets where acute shortage of

drinking water

Empower front line volunteers.

(Local & International NGO'S)

Dr Smarajit Roy (Neat U Loo)

Dr Smarajit Roy (Neat U Loo) 15

Tripartite Partnership

Dr Smarajit Roy (Neat U Loo) 16

Parallel System Water Main (In & Out)Water Mains

Drinking Water Tank

Bath

Sea

Kitchen

Waste Water

Pump

Toilet Water Tank

Toilet

Waste Water

Decentralised Anaerobic Treatment Plant

Combined Heat & Power (CHP) Plant

Urine Separating Decentralised Main

Nitrogen + Phosphorous

Soil Conditioning

Fertilizer

Sludge Holding TankFilter Inorganic

Solids

Waste Water

HOUSE PLANT