Purification of Aquarium Water by PVA Gel-Immobilized Photosynthetic Bacteria during Goldfish Rearing
2009
Jeong, S.K. (Pukyong National University, Busan, Republic of Korea) | Cho, J.S. (Doosan Ecobiznet, Yongin, Republic of Korea) | Kong, I.S. (Pukyong National University, Busan, Republic of Korea) | Jeong, H.D. (Pukyong National University, Busan, Republic of Korea) | Kim, J.K. (Pukyong National University, Busan, Republic of Korea), E-mail: junekim@pknu.ac.kr
This study was conducted to evaluate the ability of a PVA-gel beads filtration (PVA) system using photosynthetic bacteria to purify water. To accomplish this, duplicate long-term goldfish rearing experiments were conducted using four different types of aquarium systems (COF, PSB, EMC, and PVA). The results revealed that the concentrations of NH₄+-N on the day of a goldfish's death were significantly higher than the concentrations on other days for all the aquarium systems. In addition, the mean concentration of NH₄+-N during goldfish rearing occurred in the following order: COF system greater than EMC system greater than PSB system greater than PVA system. Furthermore, the mean values of all other ion concentrations (NO₃--N, NO₂--N, and PO₄²--P) were found to be lowest in the PVA system. As a result, there was more prominent decomposition of organic matter in the aquarium tank containing the PVA system, as well as less turbid aquarium water and more active goldfish. Additionally, the PVA-gel beads resulted in almost complete denitrification, even after six-months of goldfish rearing. To our knowledge, this is the first study to report that PVA gel-immobilized photosynthetic bacteria have the ability to purify water. Overall, the results of this study indicate that this immobilized photosynthetic bacteria system has the potential for use as a component in circulating filtration systems.
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