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Or maybe composting room

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Note added at 18 hrs (2023-05-05 10:29:02 GMT)
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An explanation written by one of my colleagues:
Souring pit and levigation are two different processes used in different fields, but they may be related to the construction or tile-making industry.

Souring pit, also known as a fermentation pit or bacterial pit, is a pit or container used for the fermentation of organic matter. It is commonly used in the food and beverage industry, particularly for the fermentation of foods such as vegetables, grains, and dairy products. The process of fermentation involves the conversion of sugars and other carbohydrates into organic acids, gases, and alcohol by microorganisms such as bacteria, yeast, and fungi.

Levigation, on the other hand, is a process used in the preparation of clay for use in ceramics, such as tile making. It involves the grinding and washing of clay to remove impurities and produce a smooth, fine-grained material that is suitable for use in ceramics. The process of levigation involves mixing the clay with water to form a slurry, which is then passed through a series of screens to remove impurities. The slurry is then allowed to settle, and the clear water is decanted off, leaving a sediment that is dried and processed further.

While souring pits and levigation are different processes used in different industries, they may be related to the construction or tile-making industry. For example, souring pits may be used in the production of cement or other construction materials that require fermentation, while levigation may be used in the preparation of clay for use in ceramic tiles.