Hydroponic method for ramie and removal of nitrogen and phosphorus from livestock wastewater

ABSTRACT

By using a hydroponic culture system, the terrestrial fiber crop ramie can growth optimally in aquatic environment and enhance exponentially quantities of high quality seedlings for subsequent field cultivation. In this study, the survival rate of ramie seedling was more than 97% when cultured using the novel hydroponic method. Further physiological analysis of the hydroponic ramie to different concentration of livestock wastewater demonstrated that all of these ramies can survival in livestock wastewater, but the 4 times diluted livestock wastewater (total N: 100.9 mg L⁻¹, total P: 2.69 mg L⁻¹) was more appropriate for ramie growth. The nutrients N and P in livestock wastewater were significantly decreased by the growth of ramie, and the removal efficiency of total N and total P in the 4 times diluted livestock wastewater achieved 78.1% and 43.1% respectively within 5 weeks. In conclusion, our studies highlight that the combination of ramie and the hydroponic technology resulted to be effective in the phytoremediation of livestock wastewater.

KEYWORDS:

• Bio-removal
• hydroponic culture
• livestock wastewater
• ramie

Funding

This research work was supported by the Agricultural Science and Technology Innovation Project of Chinese under grant number CAAS-ASTIP-2016 and China Agricultural Research System under grant number CARS-16.