TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The embedded integrated aerobic processing system is orderly separated as five sections: a first-level contact oxidizing pool, a second-level contact oxidizing pool, a secondary depositing pool, a sludge pool and a clean water pool; and the clean water pool is connected with the undercurrent type artificial wetland processing system through pipeline. The clean water pool and the undercurrent type artificial wetland processing system have difference in height. The undercurrent type artificial wetland processing system orderly comprises a vertical flow artificial wetland and a horizontal flow artificial wetland. The bottom part and four walls of baffles of vertical flow artificial wetland and the horizontal flow artificial wetland are provided with impermeable layers. The top part of the impermeable layer at the bottom of the vertical flow artificial wetland is filled with artificial medium layer orderly composed of a bottom limestone layer, a mixed biologic medium layer, an upper limestone layer and a vertical flow surface organic medium layer from bottom to top. The inner side of the upper limestone layer below the vertical flow surface organic medium layer is placed with vertical flow artificial wetland water distributing tubes based on a certain interval. The inner side of the bottom limestone layer is placed with a vertical flow artificial wetland water distributing tubes based on a certain interval. The middle and the closed end part of vertical flow artificial wetland water distributing tube are separately provided with several vertical flow aerating tubes stretching out of the vertical flow surface organic medium layer. The upper part of vertical flow aerating tube is opened with an aerating hole. The vertical flow artificial wetland water distributing tubes are connected with water outlet tube of the clean water pool and with the horizontal flow wetland water distributing tubes. The bottom limestone layer is made by piling limestone having a grain size of 4-8 mm and has a layer thickness of 0.30 m; the upper lime stone layer is made by piling limestone having a grain size of 16-32 mm and has a layer thickness of 0.30 m; the mixed biologic medium has a layer thickness of 0.40 m, and the vertical flow surface organic medium layer consist of a mixture of washed sand and peat with a layer thickness of 0.20 m. The horizontal flow artificial wetland is placed with a starting end limestone section, an intermediate mixed biologic medium layer and a end limestone section along horizontal direction. The top surface of horizontal flow artificial wetland is placed with horizontal flow organic medium layer composed of mixture of washed sand and peat. The starting end of the horizontal flow artificial wetland is mounted with horizontal flow artificial wetland water distributing tubes having equal width with the pool and end part is mounted with horizontal flow artificial wetland water collecting tubes having equal width with the pool. The horizontal flow artificial wetland water collecting tubes are mounted with horizontal flow aerating tubes vertically stretching out of the horizontal flow organic medium layer in upward direction. The upper end of the horizontal flow aerating tube is opened with aerating holes. The horizontal flow artificial wetland water distributing tubes is connected with the horizontal flow artificial wetland water collecting tubes, and the horizontal flow artificial wetland water collecting tubes are connected with water outlet tube of the processing system. The limestone section is made by piling limestone having a grain size of 16-32 mm and has a length of 2 m and a layer thickness of 1 m. The intermediate mixed biologic medium has a length of 15 m and a layer thickness of 1 m, and the horizontal flow organic medium layer is made by mixture of washed sand and peat and has a layer thickness of 0.2 m.