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10 REHS Exam Private Onsite Wastewater Treatment and Disposal 1.Biochemical Oxygen Demand (BOD) ANS The difference between the initial dis- solved O2 in a water sample and dissolved O2 in a duplicate sample after a stated period of time (usually 5 days). Best single measure of wastewater or polluted water.
2.Chemical Oxygen Demand (COD) ANS A measure of the amount of O2 chemically consumed by the oxidation of organic and oxidizable inorganic materials in a water sample. Good for measuring industrial wastes.
3.Domestic Sewage ANS used water from a home or community. Includes toilet, bath, laundry, lavatory, and kitchen-sink wastes. Sewage strength is reported in BOD, SS, and COD 4.National Pollutant Discharge Elimination System (NPDES) ANS System for is- suance of permits for the discharge of treated sanitary, industrial, and commercial wastes under the 1972 Federal Water Pollution Control Act. Permit 1 / 2
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10 specifies the treatment and expected outcome of effluent to protect water quality.
5.Privy ANS where excreta is disposed without the aid of water; odor prevention is via 4" vent extending 18" above roof peak.
6.Point Source Pollution ANS any discernible, confined, or discrete conveyance from which pollutants are or my be discharged 7.Nonpoint Pollution ANS not a point source and is manmade/man-induced resulting in the alteration of the chemical, physical, biological or radiological integrity of water.
8.How a septic tank works ANS purpose 24-72 hour watertight detention tank, condi- tion sewage to be more readily percolated into the subsoil functions removal of solids, biological treatment, sludge and scum storage 9.Sewage Treatment Process ANS Anaerobic digestion operates in anoxic environ- ment, treats sewage with anaerobic bacteria, very slow