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TechDive9 Jul 2020

Flue Gas DesulphurisationWastewater TreatmentHKPC TechDive - Environmental Technology

9 Jul 2020

Billy CHEUNGSenior Consultant Green Living and Innovation DivisionHong Kong Productivity Council

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TechDive9 Jul 2020

Coal Energy is Cheap Reliable

Become a major power sources in many developing countries

Therefore,

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TechDive9 Jul 2020

Coal Fired Power Plant

Polluted Flue Gas

SO2

SO2

However…………

It produces polluted SO2 containing flue gas

which needs to install a flue gas Desulphurisation(FGD) plant to remove the pollutant SO2

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TechDive9 Jul 2020

Through the FGD plant, polluted flue gas is purified

SO2

SO2

But at the same time,Χ polluted FGD wastewater would

be generatedΧ FGD wastewater containing non

biodegradable nitrogenous compound, heavy metal, hardness, and others pollutants

FGD Wastewater

FGD Plant

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TechDive9 Jul 2020

Traditional wastewater treatment method is poor performance

Chemical Treatment

Biological Treatment

FGD wastewater

Hardness+

Heavy metal

Total Nitrogen

Poor Performance!

0

100

200

300

400

500

600

700

800

Day 0Day 1Day 2Day 3Day 4Day 5Day 6Day 7

Co

nce

ntr

atio

n o

f To

tal

Nit

roge

n (

mg

/L)

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TechDive9 Jul 2020

Chemical Precipitation

NS TreatmentBiological Treatment (Aerobic)

Biological Treatment

(Anoxic)

Biological Treatment (Aerobic)

FGD wastewater

Discharge/ Reuse

Hardness+

Heavy metalNS Compound Ammonia Nitrate + Nitrite Residual COD

NaOHSpecial chemicalAcid/Alkali Sugar

We adopt an innovative NS treatment method

The pollutant, total nitrogen content, is reduced and treated FGD wastewater meet the discharge level

Traditional Biological Treatment

Traditional Chemical Treatment

Our Innovative NS Treatment

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TechDive9 Jul 2020

Patent Geneva Award

First Invention

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TechDive9 Jul 2020

CLP – Castle Peak Power Station

Pilot test has been performed in 2017

Detail design has been completed in 2019

Case Reference

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TechDive9 Jul 2020

Investigation of Change in Nitrogen Components along the Treatment Process

• Total nitrogen declines along the process

• Almost all NS components was removed after NS treatment process

Case Reference - Finding

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200

400

600

800

1000

1200

T1 T5 T8 T10 T11 T12

Co

nce

ntr

atio

n o

f P

ollu

tan

ts (

mg/

L) Total Nitrogen

NS (Calculated)

Ammonia

Nitrate

Nitrite

ChemicalPrecipitation

NS Treatment

1st Aerobic Treatment

AnoxicTreatment

2nd AerobicTreatment

Change in Nitrogen Component along the

Treatment Process Determinant Raw Treated

Total Nitrogen 946 23.4

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TechDive9 Jul 2020

Mainland China, Vietnam and other developing countries

Next Step

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TechDive9 Jul 2020

Hong Kong Productivity Council香港生產力促進局

HKPC Building, 78 Tat Chee Avenue, Kowloon, Hong Kong

香港九龍達之路78號生產力大樓

+852 2788 5678 www.hkpc.org