Worker taking water sample out of clarifier tank of sewage treatment plant
Keywords
water,
sewage,
sewage treatment plant,
man,
engineer,
men at work,
taking,
sample,
treatment,
plant,
purification,
waste,
industry,
factory,
filter,
clarification,
recycling,
purified,
purity,
facility,
clean,
cleaning,
sludge,
tank,
pit,
basin,
circle,
environment,
ecology,
pollution,
environmental,
modern,
industrial,
dirty,
uniform,
occupation,
work,
people,
person,
caucasian