Wastewater injection well problems, processes and standards

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Authors:Oberdorfer, June A.; Peterson, Frank L.
Author Affiliations:Primary:
Univ. Hawaii at Manoa, Water Resour. Res. Cent., Honolulu, HI, United States
Source:Technical Report - Water Resources Research Center, Vol.146, 131p. Publisher: University of Hawaii, Water Resources Research Center, Honolulu, HI, United States. ISSN: 0073-1307
Publication Date:1982
Note:In English. 36 refs.
Summary:Wastewater disposal into injection wells almost inevitably results in aquifer clogging and reduced injection capacity. The first phase of this study involved monitoring of functioning injection well systems on Oahu and pointed out deficiencies in the areas of (1) site selection, (2) well design and construction, (3) injection well testing, (4) effluent quality control, (5) injection well monitoring and maintenance, and (6) injection well redevelopment. The second phase involved construction and operation of experimental injection well systems. Results show the need for selection of high initial injection capacity sites, standardization of injection testing to predict maintainable injection capacity, and well redevelopment. The third phase involved examination of near-well clogging processes and their implications for injection well operation and redevelopment. Results show that filtration of suspended solids is not a long-term cause of clogging as is generally cited in the literature. It is probably a short-term cause. As injection continues, however, the microbial biomass becomes established and biodegrades the injected organic particulates. During the same period denitrifying bacteria become sufficiently established to produce significant amounts of nitrogen gas, which in turn produces a gasbound zone about 0.5 to 1 m out in the injection stratum as revealed by the injection head gradient. Initially, most of the head loss is immediately adjacent to the well, but after several weeks it shifts to a region over 1/2 m from the well. With continued injection the nitrogen gas-bound zone slowly extends farther into the injection stratum. Superimposed on this is dissolution of the carbonate porous medium.—Modified journal abstract.
Subjects:Aquifers; Biomass; Engineering geology; Fluid injection; Gases; Liquid waste; Nitrogen; Plantae; Site exploration; Solution; Thallophytes; Waste disposal; Waste water; East Pacific Ocean Islands; Hawaii; Honolulu County Hawaii; Oahu; Oceania; Polynesia; United States; Bacteria; Clogging
Record ID:1985002508
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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