Marking, L. L., Leith, D., and Davis, J., 1990, Development of a carbon filter system
for removing malachite green from hatchery effluents: The Progressive Fish Culturist,
v. 52, no. 2, p. 92-99.

Abstract:

The U.S. Fish and Wildlife Service was granted an Investigational New Animal Drug
Permit (number  2573) by the U.S. Food and Drug Administration for the use of
malachite green as a fungicide at selected state  and federal fish hatcheries. However,
the permit required that the fungicide be removed from all treated water  after March
1989. A study was designed to (1) determine the type of filter and kind of carbon that
was most  efficient for removal of malachite green and (2) demonstrate that carbon
filters can be used to remove malachite  green from water used for egg incubation or
to hold adult salmon before spawning. Minicolumn simulation  studies showed that 8
x 30-mesh granular carbon was effective for continuously removing malachite green
from  water for 230 d at a flow rate of 500 gal/min and for only 62 d at a flow rate of
1,000 gal/min. The removal  capacity at the slower flow rate was 1.1 oz of malachite
green per pound of carbon. A filter system that  contained 20,000 lb of activated
carbon in each of two chambers was effective for removal of malachite green  from
treated water in adult salmon holding ponds at flows of 500 gal/min (6.4 gal/min/ft
super(2)) and greater.

Keywords:

aquaculture-effluents, fungicides, hatcheries, USA, wastewater-treatment;
malachite-green