Waste Management in Nerima City
1. Location
Nerima City is approximately 10 kilometers from east to west and 4~7 kilometers from north to south, giving it
a rectangular-like shape. With an area of 48.16 square kilometers, it makes up approximately 2.2% of Tokyo’s
total land area and 7.7% of the 23 wards. Within the 23 wards, it is the fifth largest following Ota, Setagaya,Adachi, and Edogawa. Nerima City has a gently sloping topography with very little difference in elevation.

Nerima CityTokyo

2. Number of households and population
Households and population in Nerima City (as of January 1, 2012)
No. of households

335,465

households

707,903people(excluding foreign nationals)
Total population
City population according tomale

342,261

peoplethe city’s Basic Resident

female352,625

peopleRegister

total

694,886

people

male

5,679

peoplefemale7,338

peopletotal

13,017

peopleRegistered foreign national
population

19.9%

Elderly population ratio (over 65)(as of January 1)

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3. Household waste management
In the 23 wards of Tokyo, each ward (city) collects and transports its own municipal waste and household
waste, and the intermediate treatment (incineration) is performed jointly by the 23 wards (Clean Association ofTokyo 23). The final disposal site is managed by the Tokyo Metropolitan Government. Therefore, Nerima City
collects the household waste put out by its residents and transports it to the incineration plant.

Trash disposal methods and categories of recyclables/trash in Nerima
Disposal methods/locations
Stations (26,280 locations)

Recyclables/trash categories
combustibles, incombustibles, plastic containers andwrapping, recyclable paper

Recycling stations (approx. 4,000 locations)

glass bottles/jars, cans, PET bottles

Designated collection placesused cooking oil, old clothes/fabric, batteries, paper
cartons

In front of homes or carry-in at the Nerima City

large-sized waste

Resource Recovery Center (by appointment, feeapplicable)

Volume of household waste collected in Nerima in 2010
Recyclables/trash

Unit: tons

category
Combustibles

129,628

Incombustibles

6,762

Large-sized waste

4,602

Recyclables

44,621

Total

185,613

The amount of trash generated per person in Nerima is approx. 0.72 kg/day.

24. Waste collection and transport
Collection in Nerima City is done by first broadly dividing it into two areas (Nerima and Shakujii Areas). One
city waste collection office has been established for each area. At these offices, a collection plan is created foreach area and collection work is performed.

Collection areas in Nerima City
Border line

Shakujii Area

Nerima Area

Nerima City Resource
Recovery Center

Waste Collection Offices
Fundamental ideas of the collection plan
① Determination of the number of waste collection trucks
Assuming a population of 700,000 people and a disposal volume of 1 kg per person per day:

Nerima City=700 tons/dayDisposal volume of 1 kg/day per person × population of 700,000= 700 tons of waste/day

Shakujii=350 tons/day

Nerima= 350 tons/day

200 tons of combustibles

1.5 tons= 130 trips= 180 trips

50 tons of incombustibles

1 ton

Since collection would= 50 trips

require 6 trips/vehicle/day…

30 trucks are needed.
100 tons of other waste(recyclables, large-sized)* The numbers used here are hypothesized and differ from actual numbers.

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② Establishment of collection zones
In Nerima City, combustibles are collected twice per week and incombustibles are collected once every
two weeks.

For combustible waste collection, areas are divided into three zones: Mon/Thu zone (Zone A), Tue/Frizone (Zone B), Wed/Sat zone (Zone C). This plan allows for the collection of combustible waste in all ofthe zones in one week.

Then, so that the collection days for incombustible waste do not overlap in these zones, the areas arefurther divided into 12 zones: 1st/3rd Mon. zone, 2nd/4th Mon. zone, 1st/3rd Tue. zone, 2nd/4th Tue. zone, andso on. This plan allows for the collection of incombustible waste in all of the zones in two weeks.

1 would put out their combustible waste on Mondays andFor example, residents living in Zone A-○

Thursdays, and their incombustibles on the 1st and 3rd Tuesdays. (See diagram on next page.)

By establishing zones in this manner, a collection plan has been devised so that the amount of waste
collected remains uniform for each day over the course of one week.
③ Establishment of collection routes
After establishing the number of garbage trucks and the collection zones, the collection routes were
carefully established so that the work volume was uniform for all vehicles.

These collection plans are reviewed on a yearly basis.

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Diagram
Example: 1st Wednesday in the Shakujii Area
*Observation area for February 1 (Wed), 2012
1 in the Shakujii Area ofThirty trucks are used to collect combustibles in Zone C and incombustibles in Zone B-○

Nerima City.

Combustible

A zoneC zoneWed. & Sat.

Mon. & Thu.

Tue. & Fri.

B zoneIncombustibleThu
2nd&4thC zone④Thu
1st&3rdMon
2nd&4thMon
1st&3rdTue
1st&3rd①Tue
2nd&4th②Fri
1st&3rd③③②①④④Sat
2nd&4th③Sat
1st&3rd5A zoneFri
2nd&4th①② Wed

Wed 1st&3rd
2nd&4thB zone