A sewage treatment plant for a town with 120000 population and water average temperature of 20'C should be designed. You are asked to design a coagulation/rapid mixer and a flocculation tank with horizontal shaft paddle. The jar tests suggest average G-value of 30 (m/s)/m, minimum water residence time of 1500 seconds and GT value from 55000 to 90000. The flocculation tank should include 3 compartments with similar compartments' geometry aspects separated using baffles partitions. The width of each flocculation tank should not exceed 7 meters due to some constraints highlighted by the project's mechanical engineers about the maximum length of each shaft. Determine: 1- The volume and dimension and power requirement of the cylindrical rapid mixer 2- The flocculation tank dimension 3- Required power for each flocculation mixer 4- The paddle wheel dimension 5- Rotational speed of each mixers (Check if the speeds are acceptable) 6- Baffle size and distribution 7- Write about any ethical concerns about your design especially if you decide to directly build the tank and mixers

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Collection Systems

The collection systems form a part of sanitary engineering, which is a sub-branch of civil engineering. It is also known as public health engineering and wastewater engineering. It is a methodology followed to remove and properly dispose of human waste, along with creating systems to provide safe and clean usable water. These measures ensure a hygienic and disease-free community. Sanitary engineering, apart from building sewer disposal units, is also involved in plumbing, fire protection, hydraulics, life safety, environmental protection, information technology, microbiology, pathology, and so on.