waste water biological treatment in an industry

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Keywords: biological, biology, circle, clean, clear, construction, dirty, ecology, engineering, environment, environmental, factory, filter, filtration, industrial, industry, modern, plant, pollution, pool, purification, purified, purity, recycling, reflection, sanitation, sedimentation, sewage, sludge, steel, storage, system, tank, treatment, urban, utility, view, waste, waste-water, wastewater, water