recirculation solid contact clarifier sedimentation tank in water treatment plant

aerial black circular clarifier clean cleaner concept conservation contact dirty distribution drinking ecology ecosystem effluent environment environmental factory full green grey groundwater industrial industry liquid microbiology nobody overflow plant pollution process production purification purified purity recirculation recycle recycled recycling round sedimentation separation separator settle settler sewage sewer sewerage sludge solid station storage system tank technology treatment waste wastewater water