| 摘要 |
<p>PURPOSE:To obtain the titled contact material capable of purifying sewage with use of a small amt. of the material by composing the material of a braid of synthetic fibers having loop yarn and specifying the weight ratio of the part of the synthetic fibers forming the loop yarn to the whole synthetic fibers constituting the braid. CONSTITUTION:The contact material consists of a braid made of synthetic fibers (e.g., vinylidene chloride synthetic fibers) and having loop yarn and the weight ratio of the part of the synthetic fibers forming the loop yarn to the whole synthetic fibers constituting the braid is regulated to 40-90%. Besides, the diameter of the single yarn of the synthetic fiber at the part forming the loop yarn is regulated to 40-120mu or preferably to 60-100mu. Consequently, an amt. of microbes sufficient for effectively purifying sewage can be stably deposited and hence sewage can be purified with a smaller amt. of contact materials than the conventional process.</p> |
