However, taken literally, "hydraulic fracturing" refers only to well-stimulation processes and excludes other potentially more health and environmentally impactful processes, including but not limited to well drilling, fracturing-fluid production, wastewater disposal, transportation of materials, and the processing, compression, and transmission of gas and liquids.
Experiments were conducted on the reactor to test its effectiveness for disinfection of drinking water in situations where the use of mercury-based UV sources is restricted or undesirable; a similar design approach could be used to develop an excimer UV reactor for disinfection of other fluid media, including wastewater or air.
Before CSG can be considered safe, further research needs to be done into the impact of fracking fluids, aquifer contamination and wastewater".
The heavily drilled Marcellus Shale, for example, contains isotopes of radium, polonium, and lead., However, the few studies that have focused on NORM in fracking wastewater (produced fluids) have reported on a single element radium., In this issue of EHP, researchers estimate total reactivity for a mixture of isotopes present in liquid fracking waste from the Marcellus Shale.
Pollution of surface water (e.g., spills of hydraulic fracturing fluid and discharge from wastewater plants) would move faster (in meters per second) and can be affected by reactions between pollutants and the particle phase (USGS 2007).
[Bureau of Land Management] Oil companies in North Dakota reported more than 1,000 accidental releases of oil, drilling wastewater or other fluids last year, data indicate.
Even a well-publicized investigation by the news Web site ProPublica that reported that there were more than "1,000 accidental releases of oil, drilling wastewater and other fluids" in North Dakota in 2011 passed without much fuss.
Further, when the human body is drained of blood, to replace that blood with formaldehyde embalming fluid, both fluids become part of the wastewater stream of the funeral home, entering the municipal sewer system (Chiappelli and Chiappelli 2008; Doughty 2014).
When these machines leaked, the fluids were collected in the wastewater system and disposed of on the property.
After construction of the well pad and its access road, wells are drilled vertically and then horizontally with drilling equipment; drilling fluids are used, and drilling wastewater is generated in this stage.
