This paper analyzes calulation and design of store solt pool horizontal flow type grit chamber and points out the errors which beginners made a practice of calulation and design.

In the light of a practical example, this article points out the existing problems with the design standards of horizontal flow type grit chamber,and discusses the factors affecting the grit deposit.

In accordance with the problems existing in the grit removal system of horizontal-flow grit chamber in a Tianjin wastewater treatment plant,the feasible reconstruction scheme for the grit removal and cleaning system was proposed,so as to improve the grit removal effect and reduce the workers' labor intensity.

Numerical simulation for rectangular settling tanks;

Due to its simple structures, convenient management, low operating costs and strong adaptabilities to the changeable water quality, the rectangular settling tanks are still widely used in kinds of water and wastewater treatment.

Back propagation(BP) neural network was adopted to fit the known horizontal sedimentation tank construction cost with the calculation surface area(S) and volume(V) of the tank as input data.

The optimal designs of horizontal sedimentation tanks and plated upflow sedimentation tanks are made when sedimentation data is provided or not.

A three-dimensional two-phase flow model was built to simulate the flow fields in rectangular sedimentation tanks.

When rectangular sedimentation tank is used in secondary sedimentation, influent density current will be formed, because of concentration difference or temperature difference between influent an.