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A STUDY OF ELECTROCHEMICAL TREATMENT ON AQUACULTURE WATER
Abstract In consideration of the aquaculture economic benefits, in Taiwan, the recirculation water aquaculture system generates a problem of ammonium and nitrite accumulation in the water because of high density farming and a great deal of over feeding. Nowadays, aquaculture farmers use biofilter to decrease the concentration of the accumulation of ammonium and nitrite in recirculation water aquaculture system. However, the equipment is extremely huge and it's not easy to clean. The main purpose of this research is to adopt electrochemical process in industrial field to purify water in the system to improve the function of the biofilter. The ammonium and nitrite were grown on the surface of turning pole-plate because ions are attracted by electropotential in the water. By scraping the high density of ammonium and nitrite on the pole-plate, we can remove ammonium and nitrite from the water. It eventually achieves the goal of the water purifying. In this research, we use a scrape stick to scrape ammonium and nitrite from the pole-plate. In order to remove both chemicals as much as possible, we use the hard rubber as scrape stick, the graphite as the anode material and the stainless steel as the cathode material with hydraulic mixing. Under the direct voltage 200 V, the pole-plate blank, 60 rpm in speed, and 20mm in distance. When dealing with the simulation water, in which was mixed with 5/10 mg/L ammonium sulphate and sodium nitrite in RO water, the concentration of the scaped ammonium and nitrite was 1.7~2.552 times higher than the original water. When the process was used to the real aquaculture process, the electric conductivity of real aquaculture water was so high up to 1131 μS/cm that the water was electrolysised. The nitrite was oxidized and disappeared. Comparing to the situation in the simulation water, it scraped less ammonium. The concentration of the accumulation ammonium was only 1.431 times as in simulation water. However, the nitrite was zero in the water. This phenomenon shows that the nitrite can be easily removed by using the electrolysis in high electric conductivity water.
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