сточные воды
- average sewage
- combined sewage
- crude sewage
- difficult sewage
- disinfected sewage
- domestic sewage
- effluent sewage
- household sewage
- industrial sewage
- municipal sewage
- raw sewage
- reclaimed sewage
- residential sewage
- settled sewage
- storm sewage
- strong sewage
- treated sewage
- untreated sewage
- weak sewage