Case studies of Advanced Construction and Demolition waste(CDW)
Recycling initiatives and technologies In JAPANAffiliation
Location
Position:
Name/Surname
e-mailTitle

SEIYUKOGYO Co.,Ltd1141-1 Kusabana , Akiruno ,Tokyo 197-0802, JapanCEOMASAHITO HOSONUMA
m.hosonuma@seiyukogyo.co.j p
Recycling Technology of construction sludge
Prevention
Re-useTheme
classification〇

Technology
development stage〇

RecycleReduce Co2
LegacyBusiness to overseas
Etc.
Practical use
Scheduled to be put into practical use by 2020
Scheduled to be put into practical use after 2020

Specific content- The processing system of Sekiyu Kogyo Co., Ltd.'s Jonanjima No.2Factory, which was completed in December 2016, is a highly integrated
processing system of the latest knowledge.
The processing system consists of two technologies. One is the latest Silt
dehyder technology as an appropriate treatment method to grasp thephysical and chemical properties of the object, and the second isdesalination technology combining micro bubbles and CO 2.
- With the new technology of Silt dehyder, the mechanical classification
point of existing cleaning technology in soil, mud, etc. was 75 µm (0.075mm), but it was possible to set the mechanical classification point to 32 µm(0.032 mm).

Appeal point-48-Recycling Technology of construction sludge
1. Outline of Jonanjima No.2 Plant
In December 2016, the Jonanjima No.2 Plant of Seiyu Kogyo Co., Ltd was completed, which had
introduced an advanced cleaning system.
Jonanjima No.2 plant full view
(3-2-11

Jonan-jima, Ota-ku, Tokyo)

Site area: 8,867 m 2

Building area: 2,699 m 2

Greening area: 1,250 m 3
Underground storage tank: 1,225 m 3

Industrial waste disposal facilities－ Crushing facilities
Incoming materials: Cinders, rubble, mixed wastes (plastics wastes, rubbers wastes, scraps,waste textiles, glass wastes, concrete wastes, and ceramics wastes)
Throughput: 2,880 t/day－ Dewatering facilities
Incoming materials: Sludge (inorganic only)
Throughput: 1,076m3/day × 2 units－ Pelletizing solidification facilities
Incoming materials: Sludge, cinders, rubble, mixed wastes (plastics wastes, rubbers wastes, scraps,
waste textiles, glass wastes, concrete wastes, and ceramics wastes)
Throughput: 1,440m3/day
Contaminated soil treatment facilities
Type of facilities and treatment capacity:
Cleaning and other treatment facilities (cleaning (extraction, washing) 120 t/h 2,880 t/day
Cleaning and other treatment facilities (insolubilization) 60 m3/h 1,440m3/ day
Screening and other treatment facilities (removal of foreign materials) 80 m3/h 1,920 ㎥/day
Screening and other facilities (moisture content control) 60 m3/h 1,440 ㎥/day
The advanced technology, which has incorporated a Silt dehyder , is a treatment system in which latest
findings are integrated at high level. Such findings are the adequate treatment process based on understandingof physical and chemical characteristics of materials to be treated, the demineralization technology in whichmicro bubbles are combined with CO2, etc. Though the mechanical classification point in terms of soil andsludge with the conventional cleaning technology was 75µm (0.075mm), a new technology with Silt dehyder
has achieved a mechanical classification point of 32µｍ (0.032mm).

-49-2. New technologies
2-1. Silt dehyder

Silt dehyder is a system achieving substantial improvement of the cleaning accuracy of soil, etc. byadding the silt cleaner to the conventional Silt dehyder.

Silt dehyder
経済性<Economical>

泥土sludge
Construction
再生率
Rateofrecycleditems60%
60%
ﾘｻｲｸﾙ率rate 60%
300mm or les s 300mm以下 Recycling60%
処分率 rate40%
Disposal
40%
Dry乾式施設
facility

泥水 watermuddy

経済性<Economical>

泥土Construction
sludge300300mm以下
mm or lessRate再生率
ofrecycleditem70%
s70%
ﾘｻｲｸﾙ率rate99%
Recycling99%
処分率 rate 1%
Disposal
1%

Dryfacility
乾式施設

150ｍｍ以下
150mmor less

４０ｍｍ以下40mm or lessCleaning
洗浄施設
facility

Cleaning
洗浄施設
facility

75μm
75μm以下泥水or less

75μm
75μm以下泥水or lessWater
treatment
水処理施設HazardousTurbidity
有害濁水処理treatment facility

Advanced washing
高度洗浄施設facility

50%

10%
脱塩等
Desalting

32μm以下泥水32μm
or less

水処理量300%

Watertreatment300%

Watertreatment
水処理施設
Turbidity
treatment
濁水処理
facility
Watertreatment
水処理施設
Hazardous
reatment
有害物処理
facility
水処理量150%
Watertreatment150%
Remaining
残渣 40%
40％

55%

5%

Remaining1%
残渣 20%
29％ 残渣（1％）
CementFinal
セメント
Raw materials 最終処分disposal
原料

Final disposal Recycled
item Recycled
item
再生品
再生品
最終処分 (product) (raw materials for RC)（製品） （RC原料）

Conventional plant

Silt dehyder plant-50-60%Recycled
再生品
item
（製品）
(product )5%

5%Recycled
Recycled
再生品
再生品
item
item
（RC原料）（製品）(product) (raw materialsfor RC)

The mechanical classification point in terms of mud with the conventional cleaning technology was 75µm(0.075mm), which can be improved to 32µm (0.032mm) with Silt dehyder. In the case of conventional
cleaning technology, the dewatered cake production rate is 27.9% when the grain size is 75µm or less. Thisfacility can recover further one third of mud as product (fine sand) at the grain size of 75µm or less.
2-2. Cleaning with carbonic-acid micro-bubbles
Conventional water cleaning could not remove chlorine solidified in inorganic mines of incinerationashes, etc. Carbonic-acid micro-bubble cleaning proved capable of demineralization.

3. Future overview
No.2 Plant is a critical hub site to consider the greater resources recycling including us. We will makeefforts for cooperative challenging with other treatment companies in Tokyo Super Eco Town.
This facility is also capable of handling disaster rubble from great inland earthquake and heavy rainfall
whose occurrence is expected and of wastes treatment containing soils, specifically chlorine. In case ofemergencies, we are confident that this facility will contribute to rapid disaster rehabilitation andrecovery of urban functions.

-51-