Preliminary Evaluation of the Control of Microbial Fouling by Laboratory and Pilot-Scale Air-Stripping Columns
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA186558
Entities
People
- Darrell Seekins
- Morris R. Rogers
Organizations
- United States Army Soldier Systems Center