Sewage sludge to resource recycling system of circulationtype

Abstract

It is intended to provide a sewage sludge-to-resource recycling system capable of solving a problem of a conventional closed composting apparatus. The present invention provides a sewage sludge-to-resource recycling system of circulationtype for recycling sewage sludge as organic waste into a useful product. The sewage sludge-to-resource recycling system of circulation-type comprises: dehydration means to dehydrate sewage sludge to form a raw material; primary fermentative treatment means comprising a horizontal cylindrical shaped fermentative treatment container configured to be rotated about a central axis thereof; raw material supply means provided on the inlet end side of the fermentative treatment container and configured to receive the raw material from the dehydration means and supply the received raw material into the fermentative treatment container; primary fermented product discharge means provided on the discharge end side of the fermentative treatment container and configured to discharge the primary fermented product outside the fermentative treatment container: secondary fermentative treatment means to receive the primary fermented product from the primary fermentative treatment means, and additionally ferment the received primary fermented product to produce a secondary fermented product having a second set water content value or less, the second set water content value being less than a water content of the primary fermented product; carbonization means to receive the secondary fermented product from the secondary fermentative treatment means, and subject the received secondary fermented product to carbonization treatment to produce a carbide; mixing means to receive the secondary fermented product from the secondary fermentative treatment means and the carbide from the carbonization means, and mix them together to produce a mixture; and water content measurement means to measure the water content of the primary fermented product discharged from the primary fermentative treatment means; wherein the mixing means is connected to third distribute and supply means, the third distribution and supply means being configured to distributively supply at least part of the mixture to the raw material supply means and / or third useful resource processing means to perform processing into a third useful product of a third form.