Hatchery treatment systems

Aquaculture hatchery water supply and treatment systems... 

Aquaculture hatchery water supply and treatment systems 15 13.4 Aeration, oxygenation and degassing... 

MASTERS A L, VINCI B J ef al. (2008) Performance characterization of influent and effluent treatment systems A case study at Craig Brook National Fish Hatchery. Aquacultural Engineering 38(1) 66-76. 

In the area of municipal and iadustrial wastewater treatment, the principal environmental issue is the toxicity of residual flocculating agents ia the effluent. Laboratory studies have shown that cationic polymers are toxic to fish because of the iateraction of these polymers with giU. membranes. Nonionic and anionic polymers show no toxicity (82,83). Other studies have shown that ia natural systems the suspended inorganic matter and humic substances substantially reduce the toxicity of added cationic polymer, and the polymers have been used successfully ia fish hatcheries (84—86). Based on these results, the EPA has added a protocol for testing these polymers for toxicity toward fish ia the presence of humic acids (87). The addition of anionic polymers to effluent streams containing cationic polymers to reduce their toxicity has been mentioned ia the patent Hterature (83). 

The selection of a suitable site for a hatchery is crucial to the cost of establishing and running the hatchery, and thus to the hatchery s economic efficiency. The better and more suitable the raw water quaUty is, the less water treatment is necessary, leading to a reduction in investment and running costs. Theoretically, hatcheries may also be established where the raw water sources are less than optimal, but these will require more water treatment, resulting in higher production costs. For sub-optimal sites, recirculation aquaculture systems (RAS) are an alternative because the amount of raw water that has to be treated will be reduced. 

Encapsulation technologies and delivery systems for food irrgredients and nutraceuticals Edited by N. Garti and D. J. McClements Case studies in food safety and authenticity Edited byJ. Hoorfar Heat treatment for insect control Developments and applications D. Hammond Advances in aquaculture hatchery technology Edited by G. Allan and G. Burnell Open innovation in the food and beverage industry Frf/ferf byM. Garcia Martinez... 

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