Waste Water Disposal Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman 2aWaste Water Disposal and Storm Drainage Chapter 4, 7; Appendix A (Wentz) and (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (3 hrs)

Individual Waste Treatment Individual Usually residential or small commercial use or areas that have no access to municipal treatment plant

Primary Treatment Septic Tanks* Individual - Primary

Individual – Primary (cont.) Improvements on Primary System Increase digestion rates.

Individual – Secondary System

Drain Field

Drain Field – “Perc” Test Length of drain tile determined by Percolation test

Mounds with Leach Beds

Seepage Pits

Evaporation Pits

Sand Filter

Individual – Tertiary System

Cost Comparisons Relative costs of home sewage treatment systems as compared to the septic tank- absorption field system (assumed to be $2,500 in spring, 1980). SOURCE:

Sewage Treatment Plants Similar to individual Three stages of treatment FILM

Next time Storm Drainage 2aWaste Water Disposal and Storm Drainage Chapter 4, 7; Appendix A (Wentz) and (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (3 hrs)