Improving deodorization at a food recycling facility: Capacity improved by 4.8 times (Introduced to: Composting facility with wine dregs, etc.) - Deodorization and Composting equipment - Miraie

CASE STUDY

Construction example

2021.10.28 DEODORIZER

Improving deodorization at a food recycling facility: Capacity improved by 4.8 times (Introduced to: Composting facility with wine dregs, etc.)

PlaceYamagata Prefecture
Processed MaterialWine dregs, compost made with a scoop stirring device
OverviewSawdust deodorization is used at the wine dregs composting facility, but foul odors are not removed completely. Necessary to increase the capacity of equipment to remove foul odors

Improving aeration in facilitiesA sawdust deodorization device was introduced, but it did not have adequate capacity. It’s necessary to remove foul odors in order to stop complaints.

In this example, the deodorization was improved at a wine dregs composting facility.

This facility uses a scoop stirring device to compost wine dregs. This deodorization facility came equipped with a sawdust deodorization building (the building in the front of the photo).

However, this causes a problem, as foul odors cannot be removed completely. As such, we decided to replace sawdust with porous glass deodorant.

This is the inside of the facility.

There are two lanes of scoop stirring devices, which stir the material on a regular basis.

There is a blower attached to the floor of the fermentation tank, so the odor concentration rises all at once when the blower is blowing and when the scoops are stirring.

Stirring.

When the scoop is operating, the odor meter measured values exceeding 450 (equivalent to an odor index of 36).

This is the inside of the sawdust deodorization building.

Sawdust fills underneath the blue net.

On the surface of the deodorization tank, the odor meter showed values exceeding 200 (equivalent to an odor index of 27).

With the goal of reducing this to a value equivalent to an odor index of less than 21 (Area B regulation value), they switched to porous glass deodorant.

The picture on the left shows the replacement work.

Porous glass deodorant in the flexible container fills the deodorization tank.

The picture on the right shows the tank after it is filled.

In this facility, the deodorization blower has a maximum capacity of 200 m3/minute, but the volume of the deodorization tank was very small at just 50 m3, so calculations show that foul odors cannot be completely removed with sawdust (200 to 400 m3 of volume would be necessary for sawdust).

Porous glass deodorant offers high performance with only a small amount, so it can even handle small deodorization tanks like in this case.

After replacement, the values measured on the surface of the deodorization tank dropped to the 90s range (equivalent to an odor index of 20).

Three times more exhaust gas can be treated, so ability to remove foul odors actually became 4.8 times higher than before porous glass deodorant was introduced.

Outside the deodorization building, after replacement foul odors dropped to a level that they could not be smelled at all, and the foul odor complaints dropped to zero. Even three years after replacement, there are still no foul odor complaints, so it has been very highly evaluated.