Subsurface injection of treated sewage into a saline-water aquifer at St. Petersburg, Florida; water-quality changes and potential for recovery of injected sewage

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Authors:Hickey, John J.; Ehrlich, Garry G.
Author Affiliations:Primary:
U. S. Geol. Surv., Tampa, FL, United States
Volume Title:Ground Water
Source:Ground Water, 22(4), p.397-405. Publisher: National Water Well Association, Ground-Water Technology Division, Urbana, IL, United States. ISSN: 0017-467X
Publication Date:1984
Note:In English. 12 refs.; illus. incl. 7 tables, sketch map
Summary:The city of St. Petersburg is testing subsurface injection of treated sewage into the Floridian aquifer as a means of eliminating discharge of sewage to surface waters and as a means of storing treated sewage for future nonpotable reuse. The injection zone at the test site at the start of injection contained saline water with chloride concentrations ranging from 14,000 to 20,000 milligrams per liter (mg/l). Treated sewage with a mean chloride concentration of 170 mg/l was injected through a single well for 12 months at a mean rate of 4.7 x 10 to the 5th cu ft/day. The volume of water injected during the year was 1.7 x 10 to the 8th cu ft. Dissolved oxygen was contained in the sewage prior to injection. Water removed from the injection zone during injection was essentially free of oxygen. Probable growth of denitrifying bacteria and, thus, microbial denitrification, was suggested by bacterial counts in water from two observation wells that were close to the injection well. The volume fraction of treated sewage in water from wells located 35 ft and 733 ft from the injection well and open to the upper part of the injection zone stabilized at about 0.9 and 0.75, respectively. Chloride concentrations stabilized at about 1,900 mg/l in water from the well that was 35 ft from the injection well and stabilized at about 4,000 mg/l in water from the well that was 733 ft from the injection well. These and other data suggest that very little near injection-quality treated sewage would be recoverable from storage in the injection zone. (Author 's abstract)
Subjects:Aquifers; Chloride ion; Chlorine; Engineering geology; Environmental geology; Ground water; Halogens; Hydrochemistry; Injection; Plantae; Pollution; Salt water; Sewage; Surveys; Thallophytes; Waste disposal; Water quality; Florida; Floridan Aquifer; Pinellas County Florida; United States; Bacteria; Saint Petersburg; Treated sewage
Record ID:1984043466
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from USGS product, Selected Water Resources Abstracts, Reston, VA, United States
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