Preliminary evaluation of the control of microbial fouling by laboratory and pilot-scale air-stripping columns. Final report, March-December 1984
The U.S. Army Natick Research, Development and Engineering Center (Natick) undertook a study to investigate the buildup of microbial slimes primarily pseudomonas, bacillus and azotobacter in Air Stripping Columns that are used by the military to remove volatile compounds from contaminated groundwater. The air-stripping and carbon-adsorption columns were previously used at the Anniston Army Depot (ANAD) to treat groundwater that had been contaminated with chemical solvents and metal-plating wastes. The major groundwater contaminants were: trichloroethylene (TCE), dichloroethylene (DCE), methylene chloride (MeCl), phenol, and chromium. The results of the study will provide the basis for recommendations on preventative or control measures to be taken in future applications of these water-treatment methods. Measures to prevent buildup of microbial slimes will allow for longer column life and reduction in costs. Treatment of the laboratory-scale column with 3% and 15% hydrogen peroxide reduced total microbial counts but was not successful at disinfecting the column. It was concluded that to prevent microbial fouling of air-stripping columns, the packing material should be disinfected prior to use and should be shock-chlorinated during use if microbial fouling should start to occur. The column should be run continuously if possible to keep the inside temperature as low as possible to retard the growth of microorganisms. If iron fouling should occur, the column should be treated with dilute HCl to clear the packing material of the hydroxide buildup.
- Research Organization:
- Army Natick Research Development and Engineering Center, MA (USA)
- OSTI ID:
- 5089357
- Report Number(s):
- AD-A-186558/3/XAB; NATICK/TR-87/039
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIOLOGICAL FOULING
WATER POLLUTION CONTROL
GROUND WATER
WATER TREATMENT
ADSORPTION
AZOTOBACTER
BACILLUS
CARBON
CHLORIDES
CHLORINATION
CHROMIUM
HYDROXIDES
IRON
METALS
MICROORGANISMS
PHENOLS
PLATING
PROGRESS REPORT
PSEUDOMONAS
SOLVENTS
VOLATILITY
WASTES
AROMATICS
BACTERIA
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CONTROL
DEPOSITION
DOCUMENT TYPES
ELEMENTS
FOULING
HALIDES
HALOGEN COMPOUNDS
HALOGENATION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SORPTION
SURFACE COATING
TRANSITION ELEMENTS
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)