Pig Farm: 94% of foul odor removed from compost equipment (Pig farm quadruples capacity of deodorizing equipment) (Introduced to: Hokkaido Prefecture) - Deodorization and Composting equipment - Miraie


Construction example

2021.10.31 DEODORIZER

Pig Farm: 94% of foul odor removed from compost equipment (Pig farm quadruples capacity of deodorizing equipment) (Introduced to: Hokkaido Prefecture)

Place:Hokkaido Prefecture
Number of Hogs:17,000
Deodorization Target:High concentration ammonia (2,500 – 2,800 ppm) from the compost
Overview:In this case wood chip deodorant, which could not remove foul odors, was replaced with porous glass deodorant.

Measures and Effects

At this farm, pig manure was composted with a vertical fermenter, and foul odors emitted from the fermenter were treated with wood chips in a biological deodorization tank.

However, foul odors from the fermenter have very high concentration, with ammonia as high as 1,500 ppm, and the removal rate with wood chips was not high enough, at just about 18%.

Because of this, ammonia was released into the atmosphere from the surface of the deodorization tank at a concentration of almost 2,000 ppm.

Therefore, they decided to replace wood chip deodorant with porous glass deodorant, improving the ability of deodorization equipment to remove foul odors.

In this case, the number delivered was set so that the removal rate is about 95%.

This is a photo after replacement.

The deodorization tank uses the same existing tank.

The structure of the piping at the bottom of the tank has been modified in order to evenly remove foul odors.

After operation started. The blown air is not off center, so it can remove foul odors in the whole tank.

Foul odor in the intake air was 2,400 ppm, but this was reduced to 0 to 80 ppm after removal.

The removal rate also improved drastically, from the 18% range before delivery to the 98% range after delivery.

Effects of Improvement

After replacing bark chips with porous glass, foul odors were removed almost completely.

Removal effectiveness was raised to almost 4 times higher than when using bark.


Vertical fermentation equipment is a composting device widely used on pig farms and poultry farms. However, it emits exhaust gas with very high ammonia concentrations of 2,000 to 3,000 ppm.

Many facilities are equipped with biological deodorization tanks for wood carriers such as bark or sawdust.

  • Shortly after operation started, removal rates dropped drastically.
  • The wood gets thinner (its volume decreases and it hardens), increasing aeration resistance, so exhaust gases do not come out as they should.
  • If no exhaust gas comes out, then there will be an impact on moisture evaporation capacity of the fermentation equipment, and composting will be disrupted.
  • Performance can be restored by replacing the carrier (wood), but this is a costly and time-consuming process. This includes the cost of wood, the cost of replacement (heavy machinery costs, labor costs), and disposal of removed wood.

These 4 problems arise.

Porous glass deodorant uses foam glass as its carrier, so there is no need for concern about microbial decomposition or reduced volume as there is with wood. Therefore,

  • It can remain stable for a long period of time.
  • It frees the user from the cost and effort of replacing carriers.
  • It realizes a great removal benefit with little carrier.

These benefits can be realized.