Effects of Zingiber officinale Roscoe. extracts in growth media on nitrate and phosphate removals for growths and accumulations by

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Surattana Settacharnwit

Abstract

 The most effective measure for prevention and mitigation of water quality and ecological degradation from eutrophication is the minimization of NO3-N and PO4-P to the standards set out before discharging into waterways. Floating plants can absorb excessive NO3-N and PO4-P from sewage water effectively via their roots for growth. This mechanism supports ecological sustainability, as the result of their natural abundance, well-adaptation and aesthetics in water ecosystem. The experimental design was set up to achieve the objectives of comparing the growths of I. aquatica (water spinach) by fresh biomass experimented in 4 treatments of media growth (NO3-N and PO4-P concentrations at 20 mg-N/L and 1 mg-P/L) with the additions of Z. officinale (ginger rhizome) extracts at 0, 2,000, 4,000, and 6,000 ppm, respectively. Their efficacy of NO3-N and PO4-P removals (%) are analyzed. Analyses of variances (ANOVA) at a confidence level of 95% and Duncan Post Hoc Tests were performed to determine the differences among efficiency of NO3-N and PO4-P removals (%) and growths of I. aquatica. The results revealed that the application of the 4,000 ppm extract was appropriate for I. aquatica growth and the remediation of nutrient-rich waters. This is owing to the highest biomass of 130.08±25.33 g (sig=.015) which was mainly derived from the upper parts (leaves and stems) and the uttermost NO3-N at 67.9±6.20%, while the second most PO4-P at 95.55±3.98 % (95.75±3.22% in the controls) removals were found in 18 and 15 days. Moreover, the far below European Commission maximum levels for nitrate as contaminants in fresh vegetables (for fresh spinach) at 86.95± 4.40 mg-N/Kg may strengthen the safety for human and animal consumption.

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Settacharnwit, S. (2018). Effects of Zingiber officinale Roscoe. extracts in growth media on nitrate and phosphate removals for growths and accumulations by. Interdisciplinary Research Review, 12(6), 55–63. Retrieved from https://ph02.tci-thaijo.org/index.php/jtir/article/view/124112
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Research Articles