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Energy Management System Using Intensive

Solid-liquid Separation Technology

－ B-DASH Project －

(Breakthrough by Dynamic Approach in Sewage High Technology)

April 8, 2014

METAWATER Co., Ltd.

IWA Half-day Seminar in Tokyo

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Outline of 23B-DASH Project

Goal

Construction cost : -25%

Energy consumption : -80%

Greenhouse gas : -65%

Life-cycle cost : -30%

vs. conventional system

B-DASH : Breakthrough by Dynamic Approach in Sewage High Technology

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Gas holder

Thermophilic digesterHigh rate filter

Hybrid FC

Garbage grinder

Demonstration Plant

Test site : Nakahama WWTP in Osaka

HRF : 5,700m3/d (1.5MGD) (Dry)

20,520m3/d (5.4MGD) (Wet)

Digester : Sludge/garbage 0.3/0.21 t-DS/d

Biogas 16m3/h

Hybrid FC : 100kW

The project, led by MLIT, was carried out in cooperation with Japan Sewage Work Agency.

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High Rate Filtration System

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High Rate Filtration System

Distribution channel

ｽｸﾘｰﾝ

Rapid cleaning device

Sludge

Filtrate

Wastewater

Upper screen

Quick-move valveFilter media

原水

ろ過

ろ過水

上向流

高速洗浄装置

上部スクリーン

原水

下向流 洗

浄排水

洗浄

上部スクリーン

Cleaning

Up

-flo

w

Do

wn

-flo

w

Filtration

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原水濃度と除去率（SS）

0

10

20

30

40

50

60

70

80

90

100

0 50 100 150 200 250 300SS濃度（mg/L）

除去

率（％

）

原水濃度と除去率（BOD）

0

10

20

30

40

50

60

70

80

90

100

0 40 80 120 160 200 240 280 320BOD濃度（mg/L）

除去

率（％

）

BOD removal rate

Filter Performance

HRFS

Primary

clarifier

Raw water

Filtrate

SS removal rate

Primary

clarifier

HRFS

Primary

clarifier

Inlet SS conc. (mg/L)

Inlet BOD conc. (mg/L)

Rem

oval ra

te (

%)

Rem

oval ra

te (

%)

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Primary sedimentation High rate filtration

Treatmentperformance

Fair

SS removal : 50 %

BOD removal : 40 %

Good

SS removal : 70 %

BOD removal : 50 %

Powerconsumption

100 100

Overflow rate 50m/d (0.9gpm/ft2) 250 - 1,000m/d (4.3 - 17gpm/ft2)

Footprint 100 35

Other

application－ Primary clarifier alternative (250m/d)

Earthquake

resistance

Poor

Chain dislocation etc.Fair

Seismic-resistant structure(A primary clarifier can be converted to a HRF)

Reference Many 26 locations nationwide

M

Comparison with Primary SedimentationA

dded v

alu

e

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Thermophilic Digestion

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Thermophilic Digestion

Gas holderGarbage from Restaurants& hotels etc.

Biogas

Primary sludge

Garbage

grinder

Thermophilicdigester

Digested sludge

Fuel cell

Special carrier

■ Enhanced biogas production by co-digesting sludge and food waste

■ Small footprint ･･･ Min. HRT 5days

■ Durable against load fluctuation through special carrier

Dewatering

10

0

10

20

30

40

50

60

70

80

90

100

7/1

7/8

7/15

7/22

7/29 8/5

8/12

8/19

8/26 9/2

9/9

9/16

9/23

9/30

10/7

10/1

4

10/2

1

10/2

8

11/4

11/1

1

11/1

8

11/2

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VS分

解率

[%]

, メタ

ン濃

度[%

], H

RT [

日]

0

100

200

300

400

500

600

700

800

900

1000

投入

DS量

[kg

DS/日

], 消

化ガ

ス発

生量

[m

3N/t

-投入

VS]

生ごみDS 生汚泥DS ガス発生量 HRT VS分解率 メタン濃度

Start-up HRT : 5days

Sludge : Garbage=1 : 0.7

Digestion rate & Biogas Generation

gas Generation

Garbage DS Primary sludge DS Gas generated VS decomposition CH4 conc.

Sludge : Garbage=1 : 0.5

VS

de

co

mp

ositio

n r

ate

(%

), C

H4

co

nc.(

%)

DS

fe

d (

kg

DS

/d),

Ga

s g

en

era

ted

(m

3N

/t-v

s)

Stable digestion and gas generation and with short HRT

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Smart Power Generation System

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平準化前

0

100

200

300

400

500

600

700

800

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

平準化後

0

100

200

300

400

500

600

700

800

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Smart Power Generation System

Plant operation optimization

1) Power cost saving

- Contract demand reduction by demand peak leveling

- Full biogas utilization by supplementing with city gas

2) Power supply by FC using city gas in emergency/blackout

Hybrid fuel cell power generation

0

100

200

300

400

500

600

700

800

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Generated output(City gas)

(kW)

(時間)

(kW)

(時間)

(kW)

(時間)

Before levelingPo

we

r C

on

su

mp

tio

n

After hybrid power generation

Advantages

Leveling by demand

monitoring/control

Generated output(Biogas)

After leveling

Contract demandPower purchase

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Hybrid Fuel Cell (100kW)

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Summary

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Expected Outcome

Finance

Safety

Environ-

ment

Life

Power cost reduction

- Enhanced power generation by co-digestion

- Aeration power saving by HRFS

CSO/SSO countermeasure by HRFS

GHG reduction by biosolid/biomass utilization

Disaster-resistant system

- Enhanced primary treatment by HRFS in emergency

- Emergency power supply by Hybrid FC in blackout

Possible disposer diffusion in the future

- Enhanced SS recovery by HRFS

MSW (Municipal Solid Waste) volume reduction

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会社概要

Thank you for your attention.

Beyond engineering