Speaker

Deputy Director: Home-Ming Chen

Circular Economy of

Sewage Treatment Plant

Sewerage Systems Office,

Public Works Department,

Taipei City Government 2018/8/31

Outline

Organization

Sewage Treatment Process

Circular Economy of Sewage Treatment Plant

Vision in the Future

Director

Deputy

Director

Chief

EngineerChief

Secretary

Public

Work

s S

ection

Sewerage Systems Office(SSO),

Public Works Department,

Taipei City Government

3

Design, planning, construction, management and maintenance of Sewer System

Organization

Desig

n P

lannin

g

Section

Opera

tion M

anagem

ent

Section

En

gin

ee

rin

g Q

ua

lity

Assura

nce S

ection

Main

tenance S

ection

Facili

ties M

anagem

ent

Section

Dih

ua

Sew

age T

reatm

ent P

lant

Bali

Sew

age T

reatm

ent P

lant

Neih

u

Sew

age T

reatm

ent P

lant

Syste

ms

Adm

inis

tration S

ection

Adm

inis

tration

Serv

ices O

ffic

e

Accounting O

ffic

e

Pers

onnel O

ffic

e

Govern

ment E

thic

s

Off

ice

Dihua Sewage Treatment Plant

• Largest secondary sewage

treatment plant in Taiwan

• Capacity: 500,000 CMD

• Build underground

• Park on top

• First double-decked clarifiers

in Taiwan

4

Sludge Thickeners

Primary Clarifiers

Fine Bar Screen

Deep Aeration Tanks

Secondary Clarifiers

Disinfection Tanks

Anaerobic Digesters

Belt Filter Dewatering Machines

SludgeDryingSystem

Primary Sludge

Secondary Sludge

Return Sludge

Digestion gas

Incineration

Tamsui River

Sand Filter

Reclaimed Water

Domestic Sewage

Reuse

5

Influent

Effluent

Dihua Sewage Treatment Plant

66

Resource

Disinfection

Sand filter

✔Reclaimed

water

7

Effluent

Liquid - Reclaimed water

8

Liquid - Reclaimed water

Irrigation in Dihua Park

9

• Road cleaning

• Reducing urban heat island effect

Liquid - Reclaimed water

12.3

2.36.2

9.6

57.2

0

10

20

30

40

50

60

70

Tap water Effluent waterfrom the Dihua

Plant

Recycled waterfrom the Dihua

Plant

MF RO

Co

st (N

TD

/m3)

10

Tap

water

Liquid - Cost of different treatments

Effluent Reclaimed

water

MF RO

• Equipment upgrade program & sustainable water usage

• MF：Microfiltration

• RO：Reverse Osmosis

Goal : Reclaimed water → Sustainable water usage

Reuse

in plant

Irrigation

Higher water

quality

Environmental friendly

Sustainable water

resources management

Renew sand filter

system

11

ReducingHeat

Island Effect

Liquid - Reclaimed water

Road cleaning

12

Sewerage Systems Office, Public

Works Department, Taipei City

Government

Solid - Sludge disposal and reuse

Zero waste policy of Taipei City Government

Sludge Reduction

◦ Drying System

Sludge Reuse

◦ Vase and permeable concrete brick

◦ Work with DEP of Taipei City Government

Department of Environmental

Protection, Taipei City Government

Collaboration

13

Sludge Drying System

Feeding

4-6 hrs

Dewatered Sludge 50 tons/day

Dried Sludge11 tons/day

80% moisture content

10%

moisture

content

124~226℃Indirect Heating

Solid - Sludge Drying system

Reduce in Weight : 78%

Materialized(mixing with clay)

• Vases and pen holders as

souvenir for visitors

14

Solid - Dried sludge reuse

Original Painting

Painting their own vases

Pen holders

15

Solid - Collaboration with DEP to LID material

Permeable concrete brick(SSO)

Low Impact Development(SSO)

Material for Sponge City

Bottom ash reuse(DEP)

• Heating value

• Incinerating

• Dried sludge reuse

Bottom ash

Sludge

reduction Digestion gas

SSODEP

● Major components of digestion gas

● Digestion gas heating value

5,000~5,500 kcal/m3

Components CH4 CO2 N2H2O H2S

contents (%) 57~62 33~38 ≦6 ≦20.005~0.0

10

16

Gas - Components of digestion gas

Pure gas(CH4) heating value

10,000 kcal/m3

Mixed sludge Dewatering,

sludge drying

• Agitation

• Heating anaerobic

digester

• Heating Drying

sludge system

Digestion gas CH4：50~60 %

Purification

Sludge after

digestion

(Digestion at 34-36℃)

17

Gas - Utilization

Digestion Gas5846 CMD

AIoT 107年7月19日星期四

氣溫：33℃

雨量：0 mm

設施巡檢APP及維護管理系統

污水下水道即時監看系統

污水處理廠放流水質監測系

統

其他延伸系統

跨平台整合系統

系統消息：

7/19系統維護公告

18

Vision in the Future

Monitor

& Control

AutomationSmart STP

Sewerage Systems Office,

Public Works Department,

Taipei City Government