免费人妻吞精合集,五月精品在线青青草,色噜噜欧美日韩性播放视频,日韩丝袜亚洲色先锋 久久

Buried sewage treatment equipment.

Buried sewage treatment equipment, sewage disposal plant is a modular, is a kind of biological treatment system of sewage purification bodies in biofilm, give full play to the anaerobic biological filter and contact oxidation bed biofilm reactor has the biological density, anti pollution ability, low power consumption, operation stable operation, easy maintenance, the system has a wide application prospect and popularization value. Buried sewage treatment equipment using biological treatment technology in the world's leading BOD5, COD, NH3-N removal in a body, is currently the most efficient sewage treatment equipment. The treated effluent meets the national discharge standard. The equipment is made of carbon steel anti-corrosion structure or glass fiber reinforced plastic composite material, the service life of more than 20 years, the top can be through the vehicle, but also can be green.