There are also some precautions of the plastic crushing and washing, because of the different of plastic type, the processes of the plastic plastic are mainly separated to two types–hard material and soft material. Their washing and cleaning methed and equipment are certainly different.

In one hand, the waste crusher of soft material and hard material are different. Specifically, their blades are different. In the other hand, in the duration of the cleaning, the soft material like plastic woven bags are always floating on the surface of the water, we call them “flaoting material”, the hard plastic like PP flakes always sink under the water, we call them “sinking material”.

一般的に言えば、硬いプラスチックはより清潔で水の使用量が少ないため、沈殿池は必要ありません。(沈殿池は、汚水が沈殿した後に汲み出して再利用できるため、水を大幅に節約できます。)しかし、浮遊物は非常に汚れており、多くの浮遊灰が付着していて、水の需要が高いです。

最近では、多くの国が下水の排出を禁止しているため、沈殿池と泥フィルター設備を設置すれば、水は基本的に国家基準を満たすことができます。