In preliminary treatment of sewage, the operation which takes place, is

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•                is the ratio of volume of recirculated sewage to the raw sewage.
• Which of the following filter is used in the anaerobic treatment of sewage?
• is a method where water is used as a medium for the flow of sewage from its production of the treatment unit.
• Primary treatment of sewage consists of removal of
• How many types of trickling filters are used in sewage treatment?
• In which type of settling, sedimentation of discrete particles takes place?
• In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?
• In which settling type, dilute suspension of particles takes place?
• Which system of collection of sewage is a dry system?
• Which system of collection of sewage is called a dry system?