The Nature Center is down stream from the Boerne Waste Water Treatment and I tested the water there and at the city park and the significance of the water quality is amazing. The city park is only fit to do boating where as the Nature Park with the added treated water is very fit to swim in kudos to BWWT they are doing a hell of a job. It was a cool field trip from UTSA.
Here is the report that was not complete
Boerne Waste Water Treatment Abstract
Three water samples of the BWWT were obtained, tested and compared, to a sample of Cibilo Creek water and treated tap water. The samples where tested for total coliforms, fecal coliforms and fecal streptococci. The three samples of water from the treatment plant were obtained at different stages of treatment, the raw sewage from the sewer lines was separated from insoluble material (i.e. plastics), the clarifier is where oxidation and the settling of floc bacteria and remaining solids occur and finally the effluent is disinfected by ultraviolet light and oxidized, before it can be released into the receiving stream. All of the samples were compared with a sample of water from the tap and upstream from the treatment plant.
Petri dishes where labeled with a broth growth medium; M-endo, MFC or KF, with the different water types (raw sewage, clarifier, effluent, tap and creek), and volume/dilution. The appropriate media from 2 ml ampules were added to an absorbent pad in labeled petri dishes. The petri dishes where grouped with the same volume/dilutions not media type and incubated at appropriate temperatures for specific periods of time. The M-endo broth dishes had an incubation time of 35degrees Celsius for 24 hours to test for total coliforms. To grow fecal coliforms MFC broth was used at a temperature of 44.5degrees Celsius for 24 hours. Finally KF broth was incubated for 48 hours at 35 degrees Celsius to grow fecal streptococci. Values and results are attached on additional page.
With the testing done there is ample disinfecting of the waste water discharged into the Cibilo Creek, the effluent stage measures for total coliforms was 32cfu/100ml; but the value of 4400cfu/100ml for fecal coliforms makes the water desirable for secondary contact water. Treated water actually makes the creek cleaner because the values of the effluent water are less than the count for the Cibilo Creek and has a permissible count of 8000cfu/100ml for total coliforms, but the impermissible count for fecal coliforms of 8000cfu/100ml doesn’t make the upstream suitable for secondary contact water. The tap water represented values for a control and assured that proper techniques where used for overall testing.