H{sub 2}OTREAT: An acid for evaluating water treatment requirements for Aquifer Thermal Energy Storage
A public-domain software package is available to aid engineers in the design of water treatment systems for Aquifer Thermal Energy Storage (ATES). Geochemical phenomena that cause problems in ATES systems include formation of scale in heat exchangers, clogging of wells, corrosion in piping and heat exchangers, and degradation of aquifer materials. Preventing such problems frequently requires employing water treatment systems. Individual water treatment methods vary in cost. effectiveness, environmental impact, corrosion potential, and acceptability to regulatory bodies. Evaluating these water treatment options is generally required to determine the feasibility of ATFS systems. The H20TREAT software was developed by Pacific Northwest Laboratory for use by engineers with limited or no experience in geochemistry. At the feasibility analysis and design stages, the software utilizes a recently revised geochemical model,MINTEQ, to calculate the saturation indices of selected carbonate, oxide, and hydroxide minerals based on water chemistry and temperature data provided by the user. The saturation indices of key calcium, iron. silica, and manganese carbonates, oxides, and hydroxides (calcite, rhodochrosite, siderite, Fe(OH){sub 3}[a], birnessite, chalcedony, and SiO{sub 2}) are calculated. Currently, H20TREAT does not perform cost calculations; however, treatment capacity requirements are provided. Treatments considered include (1) Na and H ion exchangers and pellet reactors to avoid calcite precipitation, and (2) in situ nitrate addition and cascade precipitation. The H20TREAT software also provides the user with guidance on other geochemical problems that must be considered, such as SiO{sub 2} precipitation, corrosion, and environmental considerations. The sodium adsorption ratio and sodium hazard are calculated to evaluate the likelihood of clay swelling and dispersion caused by high Na concentrations. H20TREAT is available for DOS and UNIX computers.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 10187888
- Report Number(s):
- PNL-SA-20388; CONF-920801-27; ON: DE93001551
- Resource Relation:
- Conference: 27. intersociety energy conversion engineering conference,San Diego, CA (United States),3-7 Aug 1992; Other Information: PBD: Aug 1992
- Country of Publication:
- United States
- Language:
- English
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H2O[underscore]TREAT users' manual: An aid for evaluating water treatment requirements for aquifer thermal energy storage systems
H2O{underscore}TREAT users` manual: An aid for evaluating water treatment requirements for aquifer thermal energy storage systems
Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
58 GEOSCIENCES
WATER TREATMENT
H CODES
THERMAL ENERGY STORAGE EQUIPMENT
CORROSION PROTECTION
AQUIFERS
HEAT STORAGE
GEOCHEMISTRY
SILICON OXIDES
CALCITE
MANGANESE CARBONATES
IRON HYDROXIDES
SATURATION
HEAT EXCHANGERS
250600
990200
580000
THERMAL
MATHEMATICS AND COMPUTERS
GEOSCIENCES