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Biosolids compost manufacturing process

In order to create a good environment for the microbes to do their work, ideal fermentation conditions (mixture ratios, aeration, temperature, moisture level, etc.) are strictly maintained.
This organic compost uses microbial cultures like those used to make sake, miso, and soy sauce.

1. Aquisition of raw materials

Organic sludge and plant residue from wastewater treatment centers, food plants, and beverage plants are added to a pit as raw materials.

2. Mixing process

The raw materials (organic sludge and plant residue) are mixed with starter cultures using a wheel loader, creating the ideal conditions for microbial activity.

3. First fermentation process

Once the wheel loader piles the mixture into a fermentation tank, the right amount of air is added from the bottom to encourage fermentation. After 4-5 days of microbial fermentation, the mixture has been biodegraded, dried, and disinfected.

4. Second fermentation (curing) process

A wheel loader mixes the product of the first fermentation with leftover oversized compost, breaks up the mixture, and returns it to the fermentation tank.
Just as in the first fermentation, air is added from the bottom to encourage fermentation.

5. Third to fifth fermentation (curing) processes

After the second fermentation, the mixture is broken up, returned to the tank, and fermented several more times. To increase the quality (degree of decomposition) of the product, making it more sanitary and easier to use, five fermentations are done.

6. Packaging

The finished product is passed through a rotating screen (trommel) and weighed on a scale, and a packaging machine packs it into bags.