Engineers controlling a quality of water ,aerated activated sludge tank at a waste water treatment plant
Schlüsselwörter
aeration,
cleaning,
ecology,
engineer,
environmental protection,
factory,
hard hat,
helmet,
horizontal,
industrial plant,
industry,
male,
man,
microbiology,
outdoors,
people,
pipe,
protective clothing,
quality,
quality control,
safety,
sewage,
storage tank,
talking,
tank,
teamwork,
two people,
waste,
water tank,
water treatment plant,
men at work,
working,
working out
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