wastewater treatment plant (WWTP) is a physical plant where various physical, biological or chemical processes are used to change the properties of the wastewater (e.g. by removing harmful substances) in order to turn it into a type of fresh water (effluent) that can be safely discharged into the environment or that is usable for a certain reuse purpose. The treatment of wastewater belongs to the over-arching field of sanitation, just like the management of human waste, solid waste, sewage treatmen, stormwater and drinking water treatment By-products from wastewater treatment plants, such as screenings grit chamber, sludge unit, odor removal, gases system, and other unit. A wastewater treatment plant generally requires electrical energy to function, except for certain types of constructed wetlands but they can also produce energy with anaerobic processes in the form of biogas. There are many kind of wastewater treatment unit which is based on the characteristic of the wastewater. The characteristic of wastewater are classified into physical, biological, and chemical properties. In planning a wastewater treatment system, there are some steps that we should do, they are feasibility study (FS), preliminary sizing (PS), detail engineering design (DED), tender, construction, comissioning, operational and maintenance. In this case, we will only focus on preliminary sizing (PS) and detail engineering design (DED).
Preliminary sizing (PS) is the step of sizing dimension of WWTP unit generally. WWTP is built by conducting some treatment units. All of the units should be sizing in order to know the area which is needed to support the WWTP. In preliminary sizing, we calculate the length, area, and the depth of each unit. Steps of preliminary sizing are:
