A study on the composting of sludge discharged from sewage treatment plant: High quality composting plant
2000
Fukui, S. (Hiezu Village Office, Tottori (Japan)) | Yamanishi, N. | Yoshida, I. | Misaki, T.
These day, Sewage treatment plants in rural area are being constructed in increasing numbers to protect water quality in public water body and to improve the living environment. On the other hand, amount of the sludge increases in proportion to the number of plant. Local authorities are burdened with the heavy expense of sludge disposal. Accordingly, three communities of Hiezu village, Daisen and Saihaku towns in Tottori Prefecture, started the study to construct the joint composting plant with the aim of recycling of the sludge to fields and to grow tulip by using the compost. In this paper, an attempt of construction of composting plant is described. The results obtained from this study are summarized as follows. (l) In long term experiment using a small composting plant, temperature in the tank ranges from 60 to 80 degrees C, and the water content of the compost from 40 to 50%. These data prove the better curing. (2) The components of compost after secondary curing meet the recommended standards on the organic fertilizer. (3) The rice bran added to the sludge plays a big role in increase of potassium in the compost
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