Garbage composting and recycling facility with low cost and no odor (Introduced to: Nagawa Town, Nagano Prefecture) - Deodorization and Composting equipment - Miraie

CASE STUDY

Construction example

2021.10.21 EASYJET

Garbage composting and recycling facility with low cost and no odor (Introduced to: Nagawa Town, Nagano Prefecture)

PlaceNagano Prefecture
Processed Material and AmountGarbage 1 ton/day
OverviewGarbage generated in the town is composted at recycling plants. Reducing garbage incineration costs.

Measures and Effects

Increase processing amount by shortening processing timeThe equipment takes materials from pre-processing to fermentation processing, and processing time is shortened by selecting models with appropriate capacity.
Reduce foul odors by eliminating fermentationBy keeping aerobic fermentation going throughout the year, this facility produces almost no foul odor.
Raise fermentation temperature with improved aerationEven when the outside temperature is -20˚ C, inside the facility they maintained high fermentation temperature of 70˚ C to 80˚ C.
Reduce costs by revising auxiliary materialsUsing cow manure as an auxiliary material, they realized zero auxiliary material costs. Reduces sawdust purchasing costs (¥3,000,000/year).
Improve compost quality by crushing materials and introducing equipment to remove foreign substancesBy crushing materials with a pre-processing device, it shortened the fermentation period and improved the compost quality.

This example is for a garbage recycling facility delivered to Nagano Prefecture. This facility is located in a cold region, but it operates reliably even in winter.

This facility was delivered to Nagawa Town, Nagano Prefecture, and was built on the grounds of a tourism ranch inside the town limits. It has a processing capacity of 250 tons/year and operates twice per week. It collects and recycles garbage generated by residents of the town, in order to produce high quality compost.

There are two aspects of this facility deserving special mention. The first aspect is that it has almost no odor (which surprises everyone who visits).

The second aspect is that it uses cow manure as an auxiliary material.

By immediately mixing the garbage carried in with cow manure and depositing it on EasyJet, aerobic fermentation starts in a short period, reducing foul odors from garbage.

This facility does not require a deodorization device, so costs can be kept low.

Ordinary composting facilities use auxiliary materials including sawdust and rice husks. However, this facility uses cow manure, so there is no cost for purchasing auxiliary materials.

Cow manure has a moisture content higher than rice husks, so it is not normally used as an auxiliary material. By forcibly sending oxygen in during the fermentation process with EasyJet, fermentation starts at high temperature.

Finished compost has a somewhat high moisture content, but it is possible to make high quality compost with no odor.

Compost is distributed to residents of the region so they can use it.

Processing starts by collecting garbage (household garbage and industrial garbage) generated in the town twice a week and carrying it to this facility.

The rules require residents to use biodegradable bags prepared for this facility. Bags and garbage are shredded together in a shredder and mixed with cow manure.

Next, the materials are put in the EasyJet tank and fermentation is completed in 45 days.

In this season, the outside temperature on site is already -5˚ C, but the fermentation temperature is higher than 80˚ C, so the facility operates smoothly.

A senior citizen from the area is in charge of work, but even after doing garbage measurement, crushing, mixing, and cleaning, their work is done by the afternoon.

Many municipalities are worried about the cost burden of garbage disposal.

Disposing of garbage with incinerators is expensive, costing about ¥150,000,000 per year per 10,000 people. 

Recycling garbage by composting it can reduce the cost to 1/2 to 1/3 that of incineration disposal.

By installing this facility on a ranch, it was easier to get consent from local residents, and reduce the high costs of garbage disposal. We expect that this will contribute to promoting garbage recycling by local governments in the future.

The ranch benefits as well, because its cow manure can be used as an auxiliary material, creating a new source of income. In addition, residents can expect improved public services by reducing the financial burden of garbage disposal, and obtain high quality compost free of charge. We believe this arrangement is highly beneficial to all three parties.

In the case of this facility, the amount of burnable waste brought to garbage incinerators was reduced by 200 tons per year.

We have designed many such plant-type composting facilities.

We can select the optimal model from our wealth of back data, and conduct precise simulations of management costs after operation.

Odor Measurement Report

Odor data from measurements at the entrance of the facility (downwind side)

Garbage generated in the town is composted at recycling plants. Reducing garbage incineration costs.

PlaceNagano Prefecture
Processed Material and AmountGarbage 1 ton/day
OverviewGarbage generated in the town is composted at recycling plants. Reducing garbage incineration costs.

Measures and Effects

Increase processing volume by shortening processing timeThe equipment goes from pre-processing to fermentation processing, and processing time is shortened by selecting models with appropriate capacity.
Reduce foul odors by eliminating fermentationBy keeping aerobic fermentation going throughout the year, this facility produces almost no foul odor.
Expand compost sales channels by packaging compost in bagsSome of the compost is packaged in bags, expanding the scope of users.
Reduce costs by revising auxiliary materialsUsing cow manure as an auxiliary material, they realized zero auxiliary material costs. Reduces sawdust purchasing costs (¥3,000,000/year).
Improve compost quality by crushing materials and introducing equipment to remove foreign substancesBy crushing materials with a pre-processing device, it shortened the fermentation period and improved the compost quality.

We have made a video about this case of recycling garbage into compost, which is shown here.

Features of this facility include

  • It has almost no foul odors
  • It promotes fermentation with a high pressure aeration system, making operation simple. It can be operated without know-how of composting.
  • It can be built on a small scale.

With regard to odors, many people have toured the facility, and have experienced the differences from general garbage composting facilities.