Synergistic Effects of Chemical Oxidant and Bacteria on Degradation Process of Trifluralin

Trifluralin is often used in aquiculture to clear off green moss in the bottom of a fish pond, but it is found to have some toxic effect on fish. It is, therefore, essential to remove excessive trifluralin from the pond for the growth of the fish at their late stages. In this paper two chemicals, sodium percarbonate and potassium persulfate, were tested as oxidant. Based on comparison between the two in trifluralin degradation effect, further studies were done on synergistic effects of the chemicals and bacteria on degradation process of trifluralin. Results show that sodium percarbonate is more suitable than potassium persulfate for use as oxidant to oxidize trifluralin in fish ponds. The separate use of 0.15 mg·L^-1 sodium percarbonate and 0.01% 10⁹CFU·mL^-1 FJ-01 bacteria degraded trifluralin by 44.79% and 66.78% within 5 days, respectively, while the two used together increased the degradation rate significantly up to 75.87%. The findings indicate that the use of chemical oxidant and bacteria together is an effective method of remedy trifluralin polluted pond water. The study may shed light on the issue of quality safety of aquatic product.