Water Quality – Aquafine
Seafood processing effluent disinfection using newly developed
UV DISINFECTION TECHNOLOGY
BY DEXTER BRUCE F
armed salmon held in sea cages are occasionally harvested when disease detection has occurred. In
Canada, new guidelines under de- velopment will require processing plants to disinfect effluent blood water to prevent the release of the disease causal agent(s) into an outfall when processing these fish. There are many disinfectant technology choices available; with the most recent to be proven and accepted being ultraviolet (UV) light.
INNOVATION In proactive efforts taken by two
major seafood processors in the Canadian province of British Co- lumbia, who are eager to be ahead of the guideline implementation curve, Aquafine Corporation developed a new and innovative UV system which is capable of disinfecting this very low qual- ity effluent. In each case the UV equipment is part of a larger treat-
UV light is the most
recent proven disinfectant technology choice
ment system comprising: coarse screens for large solids removal; dissolved air flotation for reduc- tion of fat, oil, grease and blood concentrations; and final filtration using a rotary drum screen filter (Picture 1). Effluent quality after these treatment stages ensures TSS ranges from 100-500 mg/L and the UV transmittance of the effluent ranges from 0.5-20%. Using a number of banks of UV
Photo 1: UV treatment bank, blood water effluent disinfection Photo 1. – UV treatment bank, blood wate Picture 1: Process layout of blood water effluent treatment system incorporating UV disinfection 24
The reasons UV disinfection systems were treated continuously (while processing), m and health and safety issues are greatly re Chemical disinfection of the blood-water, w chemicals due to the scavenging of chemic costly; especially when residual disinfectan receiving waters.
chambers in series (Photo 1) the effluent passes through each par- ticular system at peak flows of 45- 56 m3/hr while minimally achieving 3 log reduction of the target pathogen(s) prior to discharge. Both installed systems have been independently validated for achieving these performance levels using accepted bio-assay testing methods. These systems were demonstrated to be highly effec- tive in meeting the requirements of the forthcoming guidelines and have been proven to be extremely
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