Septic Tank Design Guide: Principles and Practices, Exams of Public Health

This document provides an overview of septic tank design for residential applications, referencing relevant plumbing code tables. It defines septic tanks, explains the roles of aerobic and anaerobic bacteria in decomposition, and details key design elements like leaching and digestive chambers. Effluent disposal methods, including subsurface disposal fields and seepage pits, are discussed with references to plumbing code tables for capacity calculations. Sample problems illustrate septic tank sizing for commercial buildings based on user numbers. The document highlights the importance of proper design criteria, materials, and compartment sizes for clarified effluent and sludge/scum accumulation. Manhole dimensions, inlet/outlet pipes, ventilation, structural considerations, and location guidelines to prevent water system contamination are also covered. Finally, it briefly overviews wastewater grades and sewer classifications.