What standard can domestic sewage treatment equipment achieve in treating general domestic sewage?

This is not fixed. There are many domestic sewage treatment equipment, but the treatment technology is mainly biological treatment technology, including AO process, A20 process, biological aerated filter, contact oxidation tank technology and so on. What standard domestic sewage treatment can reach is closely related to the technology adopted. For example, the standard of AO process is Grade B, and the standard of A2O process is Grade B, so the new MBR process can reach Grade A standard. Therefore, the process adopted has a great relationship with the treatment standard.