Septic Tank Bacteria

Sewage
Sewage typically contains 95% to 99% water.

Impurities in sewage

Micro organisms
Often includes disease causing organisms (pathogens), including bacteria, viruses, protozoa and parasitic worms. Usually measured by the presence of E.coli (a common type of bacteria found in the intestines).
100 mL of sewage contains around 10 million E. coli bacteria.

Phosphorus compounds
These are present in human wastes (feces) and in detergents. Typical levels are 15 to 20 mg per liter of sewage.

Nitrogen compounds
These are mostly present as ammonia or urea. Typical levels are up to 100 mg per litre of sewage.

Suspended solids
Includes inert material such as sand and organic solids such as food scraps. Typical levels in sewage are 400 mg per litre.

Organic matter
Usually measured by BOD (Biological Oxygen Demand) or COD (Chemical Oxygen Demand).
This can include feces, fats and oils. Typical BOD levels in sewage approximately 400 mg per liter.
Additionally, sewage will contain rags, plastics, sanitary products and other large solids.
Trace amounts of other compounds, including heavy metals and various organic compounds (e.g. pesticides, herbicides, and weedicides) will also be present, even in purely domestic sewage and in higher levels if incorrectly treated trade wastes have entered the sewerage system.

 

 



Previous Article : Septic Tank Pump Out - - Next Article : Aerobic Treatment Unit

Featured Articles
Providing Quality Service...Guaranteed In the Greater Austin Area of Travis, Hays, Williamson, Burnet, & Bastrop Counties , Volente, Lakeway, Austin, Hays County, Kyle, San Marcos, Florence, Thrall, Williamson County, Misc Locations, Bell County.
Call (512) 338-1804 for fast, dependable service.
Maintenance Here's a little discussed but logical fact of life regarding septic systems: All septic systems require maintenance to keep them working correctly and to ensure...
Alternative Septic System Regarding your Home Aerobic Treatment Unit: The components in your home plant should be serviced at least twice per year. The tanks must be...
Improved Efficiency - Public And Private (Rare story: A public agency and private company work together to improve efficiency for themselves AND their customers.) Background:   Since the State-wide change in...
  • Service Plans Dislike paying big unexpected repair bills on your septic system? Announcing an SOS exclusive! Service Plans that eliminate...
  • Septic Pumping Services If you are considering the purchase of a home, you may not know the size of the tank,...
  • The Best Septic System What is the best OSSF on the market?The one that is getting proper service! Even the best equipment...
  • Septic Above Ground Septic tanks can often sit on or above ground, for several reasons:Above-ground tanks may be appropriate in water-front...
  • Septic Tank Installation If a septic tank isn't watertight, water can leak into and out of the system. Usually, water from...