Abstract
The efficiency of the combined process of ozonation with Vallisneria natans to improve the quality of piggery effluent was investigated in this study, and the effects of ozonated water on the antioxidant responses of V. natans were explored. The effluent was treated with ozone at 10, 30 and 50mgL−1 for 30min in combination with V. natans for 28−d. Combined treatment was successful at removing inorganic nutrients and organic compounds from piggery effluent. Low ozone concentration treatment of water was optimal for the growth of V. natans, while exposure to high levels for long periods of time increased reactive oxygen species (ROS) and damaged their antioxidant systems. The results demonstrate that combined ozonation and submerged macrophytes treatment, can remove inorganic nutrients and organic compounds from piggery effluent, reducing the pollution into aquatic ecosystem.
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