This paper describes the results of two pilot studies in which continuous chloramination
was evaluated for control of biofouling during reverse osmosis (RO) treatment of a brackish groundwater
(Study A), and a surface water (Study B).
Study A comprised the testing of RO treatment for demineralization of an aerated
groundwater contaminated with trichloroethylene (TCE) for the removal of total dissolved
solids (TDS), nitrate and arsenic. A major concern
in the application of RO to this groundwater was the potential for biological fouling due to
the elevated dissolved oxygen content (from air stripping of the groundwater to remove the
TCE) and presence of trace levels of assimilable organic matter from groundwater pollution.
To address this concern, a pilot study was conducted to determine to what extent biofouling
would occur and to assess the ability of continuous chloramination to control biofouling
without causing any membrane degradation. The paper provides
a schematic for the pilot-scale treatment process used. The surface water used in Study B pilot testing was taken from Lake Monroe, one of many lakes
located along the St. Johns River, which drains the watershed located in the northeastern
portion of Florida. The paper provides the mean, maximum and minimum values for key water
quality parameters of the lake water as measured during the sampling period January 2000
to August 2002. RO treatment was evaluated to remove color, reduce dissolved organic
carbon (DOC) levels (to ensure compliance with disinfection byproduct regulations
following free chlorine disinfection) and to reduce TDS to
| Edition : | Vol. - No. |
| File Size : | 1
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| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 16 |
| Published : | 03/01/2005 |
