欧美视频观看一区|操逼视频国产毛片|国产午夜福利加勒比亚洲无码|超级碰碰碰99|九九99大香蕉视频|国产亚洲经典视频|精品人妻一区2区|亚洲精品A一本|mm1313教师|男女视频久久一区

English|中文
Products & Tech
Science and technology improves the environment, while innovation attains better future
Current Location:HOME>Products & Tech
Denitrification and Nitrification Biological Filter Integrated Process (DNF+BAF)

Biological Filter is man processing technology relying on physical filtration of the filler in the sewage (waste) water treatment structures, whereas it attains the pollutant removal from sewage (waste) water with the biochemical action of microbial film attached and growing on the filler.