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Removal of Two Chlorinated Compounds from Secondary Domestic Effluent by a Thin Film Technique¹

ABSTRACT

Removal of two chlorinated compounds from secondary domestic wastewater was examined in central Florida using four thin-film raceways (7.32 m long by 1.22 m wide by 4.0 cm deep) containing the aquatic macrophyte pennywort (Hydrocotyle umbellata L). Two raceways received secondary effluent amended with 5.0 mg/L of monochloramine plus 1.0 mg/L of 2,4-dichlorophenol (2,4-DCP) and two raceways received secondary effluent only (controls). Mass balances indicated 100% removal of monochloramine and >95% removal for 2,4-DCP after loadings of 25.2 and 6.1 g/m², respectively, over the 60-d study. This study demonstrates the potential of aquatic macrophyte-based thin film systems for reducing concentrations of chlorinated compounds to acceptable levels under high wastewater loadings and short residence times ( 10 h).

Key Words: nutrient film technique • 2,4-dichlorophenol • monochloramine

¹ Research supported by the U.S. Dep. of Energy under the Small Business Innovative Research Program, Contract no. DE-AC05-85ER80259, received 09-16-85. Research was performed while principal author was on leave of absence from his current position.

² Associate professor and research assistant, respectively, Dep. of Environ. Sci. and Eng., Florida Inst. of Technol., Melbourne, FL 32901; and environmental associate, Reedy Creek Utilities Co., Inc., Lake Buena Vista, FL 32830.

Received for publication August 19, 1986.