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механическая очистка сточных вод stresses
agric.	mechanical purification of sewage water
construct.	mechanical purification; mechanical treatment of sewage; sedimentation; settlement; sewage clarification
ecol.	mechanical sewage treatment; primary sewage treatment
Makarov.	primary treatment of wastes
nat.res.	primary sewage treatment; preliminary treatment; primary clarification
механическая очистка сточной воды
forestr.	wastewater screening

механическая очистка сточных вод: 2 phrases in 2 subjects

Construction	1
Water supply	1