Sewage treatment plant

As water treatment equipment company, water treatment equipment manufacturers, often asked: sewage treatment plants have? I adjusted ( Apart from some small factory sewage treatment plant) , large sewage treatment plant has 5:
1, the city seven sewage treatment plant
2, municipal drainage corporation four fort
3, municipal sewage treatment plant and drainage management office is also called the xiaoshan xiaoshan district sewage treatment plant 4

5 tangxi, city sewage treatment plant, west of the city sewage treatment plant