Mechanics Performance of the Fibrous Concrete of Polypropylene and Application in the Ditch;

The technology for periphery-feed secondary clarifier has been monopolized by the foreign manufacturer,parti-cularly,the calculation method for equally water distributing by influent channel is business secret.

This article has studied the role of clay overburden layer in prevention of contamination from seepage of wastewater ditch to underground water with a analogy method ,and in order to prevent contamination of seepage wastewater, the study defermined the critical thickness of clay overburd layer.