Deodorization at the Sludge Composting Center: Removal of Odor 7 Times More Effective Than Conventional Methods (Client: Sludge Composting Facility)

Overview of Composting at Sludge Composting Facility in Aichi Prefecture

At the sludge composting center, there are separate buildings for the primary and secondary fermentation stages, and the secondary fermentation building lacked deodorization equipment.
As a result, the humidity inside the fermentation building became very high, around 90%, leading to condensation and corrosion of the building.
High humidity in the facility also impeded moisture evaporation during composting, resulting in longer composting times.

Issue Before Installation

Issue 1: High odor concentration in the secondary fermentation tank.
Issue 2: The humidity in the secondary fermenter is high, causing condensation in the building. Moisture evaporation is not progressing well.
Issue 3: To take all possible measures to prevent odors and to consider the surrounding environment.

Introduction of “MIRAIE Biological Deodorizing Equipment” in the secondary fermentation building

While the primary fermentation building was equipped with rock wool deodorization equipment, installing similar equipment in the secondary fermentation building would have been significantly expensive.
Therefore, it was necessary to have equipment that, even in small quantities, provided high removal effectiveness for adequate ventilation in the secondary fermentation building.

The newly installed deodorizing equipment for the secondary fermentation building uses porous glass.
It has the same area as the existing equipment but can process three times the exhaust gas.

This is the inside of the deodorization tank. Porous glass deodorizer is filled under the net.

More than 7 times more effective in improving odor

Above is a table summarizing the effects of the installation.
Three times as much exhaust gas is flushed through the existing rockwool deodorization system, and almost completely removed.
The removal effect was more than seven times higher than that of rockwool.

Water content was reduced and composting was successfully completed in a short period of time

After the installation of the porous glass deodorizer, the humidity in the fermentation building also decreased and the moisture transpiration rate during composting increased significantly.
The moisture content of the finished compost was
Before Delivery　60% → After Delivery　40%
and it became possible to produce high quality compost in a short period of time.