Landscaping business and road maintenance, recycling by composting pruned branches and leaves (Introduced to: Landscaping Business Company T) - Deodorization and Composting equipment - Miraie

CASE STUDY

Construction example

2021.09.26 EASYJET Jr.

Landscaping business and road maintenance, recycling by composting pruned branches and leaves (Introduced to: Landscaping Business Company T)

PlaceTokyo Prefecture
Processed MaterialPruned branches, cut grass, etc.
OverviewPruned branches generated from road maintenance work is composted for low cost at in-house facilities, reducing processing costs.

Measures and Effects

Increase processing amountBy improved aeration, they shortened the fermentation period and increased the amount of material processed.
Raise fermentation temperatureCompared to conventional systems, the fermentation temperature increased.
Reduce costsBy eliminating the need for turn over, they reduced labor costs.

Company T in the suburbs of Tokyo does contracted road maintenance work for local governments. The large volume of pruned branches, leaves, and cut grass they generate during work is usually disposed of as industrial waste. However, Company T is working to reduce their processing costs and environmental burden by recycling this material as compost.

Until now, they had fermented the materials in a concrete enclosure and regularly turned it over with a backhoe. They decided to eliminate the effort made for turn over work and improve the quality of their compost by introducing EasyJet Jr.

Primary shredding

First, pruned branches and leaves are shredded as shown here.

Close up photo of primary shredded material

The size of pieces after shredding is about 80 mm or larger.

Composting is complete in about 60 days. When the fermented branches and leaves are dug up, they give off a distinct odor because of the actinomycetes growing on them.

Touching it with your hand is enough to make it crumble. This is because fermentation has progressed and substances such as lignin have decomposed.

The color has turned black, indicating that good quality compost was made.

We investigated how much pruned vegetation is produced. 

In Shimane Prefecture where our company is based, the prefectural government manages 300 kilometers of roads just within the Matsue area jurisdiction, and most of the cut vegetation is actually fallen leaves and cut grass.

About 1,500 cubic meters of this material is generated per year. They order mowing and other such work four times a year, and recorded about ¥10,000,000 for the disposal costs of cut grass.

It is a pressing matter for the government to reduce these disposal costs, and they have indicated a strong interest in recycling and utilizing the cut vegetation.

If they were to stop burning the waste and compost instead, they can reduce CO2 emissions, so it seems that there is still room for applications of technology capable of composting in a short time for low cost.

With EasyJet Jr., it is possible to compost waste without having to carry it far from the site where it is made.