| 摘要 |
PROBLEM TO BE SOLVED: To provide a combined type private sewage treatment tank which is made of iron and on each of the inner surface and the other surface of which a reinforced plastic layer is formed and in which sedimentation, aeration, microbial decomposition, etc., can be performed. SOLUTION: This combined type private sewage treatment tank is a horizontally long, almost cylindrical tank made of iron and has one or more openings on the upper side and also has a partition wall(a) made of a reinforced plastic material inside it, wherein the thickness (din ) of an inner surface reinforced plastic layer, the thickness (diron ) of an iron plate of the tank made of iron and the thickness (dout ) of an outer surface reinforced plastic layer meet the relational expression diron >din >dout , and when the diameter (D) and length of the private sewage treatment tank are 2 m and 2.5-13 m respectively, diron , din and dout are 4-8 mm, 2-6 mm and 1-4 mm respectively, or preferably, diron =6 mm, din =4 mm and dout =2 mm.
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