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

TAKATOSHI Co., Ltd
11-2 Arai-1choume Nakano-ku ,Tokyo 165-0026, Japan
Director of Planning & Development Department
KEIICHIRO NISHIDA
k-nishida@takatoshi.co.jp
Improvement of recycling by high precision sorting of construction
mixed waste
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- System flow of "High precision sorted recycling system"- High-precision screening with the mixed construction wastes treatmentline- Development of the technology for screening by color, which is to recoverhigh-quality recycled crusher-run from mixed construction wastes

Appeal point-New technology was developed to identify glasses, bricks, rigid plastics,etc. by referring to minute color difference among them. For this purpose,the color screener appropriate for screening construction wastes, whichhave been developed in coordination with the dedicated color screener
manufacturer, was combined with the non-ferrous metal screener.

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Efficiency Improvement of Recycling through High-precision Screening ofMixed Construction Wastes

1. Outline of the Tokyo Waterfront Area Eco-Plant FacilityLocation: Jonanjima 3-2-15, Ota-ku, Tokyo
Structural scale: Intermediate treatment facilities Steel construction ･ Height 26m
Office building: Reinforced concrete construction, six storied ･ Height 22.6m
Installation area: 8,997.38m2 (Reclaimed land, Tokyo)
Building area: 2,988.38m2

Total floor area：7,330.28m2

Line of business: (Industrial wastes) plastic wastes, waste paper, wooden waste, fibers waste, rubberwastes, scraps, wastes of glass, concrete, and ceramics, slag,rubble (including industrial wastes containing mercury)(General wastes) Wooden wastes, lunch wastes, wastes occurring during change ofabode-60-

2. Recycling System Flow
A “High-precision Screening Recycling System” was established, which consists of about 270 units ofequipment. This system incorporates the technology of screening mixed construction wastes
mechanically and automatically (achieving enhanced screening capacity) and the technology to facilitate
easy recycling of screen wastes (achieving increased quality accuracy).

Central control room･Valu able s･Sin gle it e mre c o ve r y･In appr o priate
c ru sh in g m at e rial

Collection andtransportation

Tokyo Waterfront
Eco-Plant

Mixed waste
Processing line

Collected items①

Hand sorting line

High pre cision
machine sorting

Collected items②

Mixture etc.

Crushing

Measurement
Non PVC type
Waste plastic
Processing line

Hand sorting line

Collected items①
Non-vinyl chloride waste
plastics, PVC waste plastics,
PVC pipes, polystyrene
foams, large iron scraps, largenonferrous metals, stainlesssteel, wood chips, cardboard,electric wires, waste tatami
matsCollected items②
Inappropriate material, woodchips, iron / nonferrous metal,
electric wire, waste paper,
cardboard, PVC pipe, nonvinyl chloride waste plastic,
PVC waste plastic

Aluminum, iron scrap
Flammable mat e rials(th e r mal r e c yc le d fu e l)

Residue
Coarse sand (+ 7to 30 mm)
Small sand (-7mm)
Small sand (-10mm)
Small sand (10 mm～)

Hand sortingline

Metal wastes

PVC type
Waste plastic
Processing line

Dumping yard· Vibration win dforce sorter· Trommel screen· Jumpin g screen· Specific gravity
difference sortingmachine· Aluminum
sorting machine

Crushedstone

Metal wastes

Concrete waste
Processing line

No n P VCt ype Wast eplastic

Crushing
Waste gypsum
board
Processing line

P VC type
Waste
plastic

Wood waste,
paper waste,
Textile waste
Processing line

Compression
packing

Plaster paper

Compression packing
Gypsu m powder
product tankFluoresce nt light
Processing line

Gypsum powder

Metal wastes

Figure 1 System flow of "High precision sorted recycling system"-61-Stockyardi i Ct t ae e rm m rs s yoa un tdrd ei cs yp co ls ea dlMeasurementshipment

3. High-precision screening with the mixed construction wastes treatment line
The throughput of the mixed wastes treatment line shown in Fig. 1 is 1,470ｔ/day. (The throughput of thefacility as a whole is 2,784ｔ/day.)This line is featured in that fine wastes (called “minus sieve residue”) left after primary treatment arescreened. This is not normally done in other intermediate treatment facilities. High-precision recycling isenabled by screening such minus sieve residue in several stages using various machines including thenon-combustibles cleaner, nonferrous screener, color screener, near-infrared material screener, screener
by difference in specific gravity, jumping screen
4. Recycled products after high-precision screening
High-precision screening of mixed wastes treatment line screens out recycled crusher-run, recycled sand,combustibles (mixture of plastics wastes, wastepaper, and waste woods), iron, aluminum, andnon-ferrous metals. Recovered dusts and fine dusts are pelletized by a kneading machine and usedcurrently as cement raw materials.
Recycled crusher-run and recycled sand are used as materials for temporary construction in theconstruction site while combustibles are used as raw materials for cement raw fuels, solid fuels, and raw
fuels for thermal recycle facilities.
From this line, there is almost no wastes to be disposed of by landfill.

ダスト加

Photo 2 Recycled products from mixed waste s-62-5. Development of the technology for screening by color, which is to recover high-quality recycled
crusher-run from mixed construction wastes
After mechanical screening, recycled crusher-run contains about 10 – 15% of glass, bricks, rigid plastics,
non-ferrous metals, etc. that are similar in specific gravity. New technology was developed to identify
glasses, bricks, rigid plastics, etc. by referring to minute color difference among them. For this purpose,the color screener appropriate for screening construction wastes, which have been developed incoordination with the dedicated color screener manufacturer, was combined with the non-ferrous metalscreener.

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