service engineer checking on waste water treatment plant with pump on background. worker working on Waste water plant.
Palabras clave
aeration,
asian,
clean,
ecology,
engineer,
engineering,
environment,
environmental,
environmental protection,
factory,
hard hat,
helmet,
horizontal,
industrial,
industry,
male,
man,
microbiology,
one man only,
outdoors,
people,
pipe,
plant,
pollution,
protective clothing,
quality,
quality control,
recycling,
sewage,
site,
storage tank,
tank,
technology,
thai,
treatment,
waste,
water,
water treatment plant,
work,
men at work
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