Tracing and age-dating recycled waste water recharged for potable reuse in a seawater injection barrier, southern California, USA
In this report we outline an investigative approach that combines isotopic tracers and tritium-helium-3 (3H-3He) dating to directly measure groundwater mixing and ages. These data can be used to test regulatory compliance in potable water reuse projects (Davisson et al., 1998). We provide an example from a seawater injection barrier located in Orange County, California, which has been injecting advanced- treated waste water into a coastal aquifer for the past 25 years to prevent seawater intrusion. Treatment comprises lime coagulation of secondary waste effluents, followed by re-carbonation, sand filtration, and reverse osmosis. The finished water has a very low TDS (-100 mg/L), which is blended -50% with a low TDS (288 mg/L) native groundwater, making an injection water of -200 mg/L.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- Orange County Water District, State of California
- DOE Contract Number:
- W-7405-Eng-48
- OSTI ID:
- 4122
- Report Number(s):
- UCRL-JC-132513; ON: DE00004122
- Resource Relation:
- Conference: International Symposium on Isotope Techniques in Water Resources Development and Management, Vienna, Austria, May 10-14, 1999
- Country of Publication:
- United States
- Language:
- English
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