This standard specifies the structural type and basic parameters, technical requirements, test methods, detection rules and markings, packaging, transportation, storage, etc. of biological contact oxidation domestic sewage purifiers. This standard is applicable to domestic sewage treatment equipment that is based on biological contact oxidation process and integrates sewage sedimentation, biodegradation and sewage disinfection. It is also applicable to industrial wastewater treatment equipment with similar water quality to domestic sewage.