
N and P Purification in Aquatic Water with Three Plants
Yu Zhenhai, Chen Youguang, Lu Hong, Zheng Yuzhen, Liu Hongcai, Sun Hua
N and P Purification in Aquatic Water with Three Plants
To study the suitable plants for N and P purification in aquatic water, Eichhornia crassipes, Spirodela polyrrhiza and Ipomoea aquatica were selected as test subjects. The biomass gradients were set up. The water samples were taken once every 5 days. The indexes of N and P such as TN, NO3 -, NO2 -, NH4 +-N and TP in aquatic water were determined and analyzed. The effects of different plants, biomass gradients and experimental time on N and P purification were studied. The results showed that the three plants grew normally and had good purification capacity for N and P in aquatic water. The three plants had better effect on N purification in 10-15 days, and on P purification in 15-20 days. The biomass of Eichhornia crassipes, Spirodela polyrrhiza and Ipomoea aquatica with the best purification effect on N and P was 2000-2500 g/m 3, 150-200 g/m 3 and 800-1600g/m 3, respectively. All the three kinds of plants can be used to purify N and P of aquatic water, the order of the purification effect on TN, TP, NO3 - was Ipomoea aquatica > Spirodela polyrrhiza > Eichhornia crassipes, while on NO2 -、NH4 +-N was Eichhornia crassipes> Ipomoea aquatica > Spirodela polyrrhiza. Eichhornia crassipes is more suitable for the purification of N and P in aquatic water.
Eichhornia crassipes / Spirodela polyrrhiza / Ipomoea aquatica / N / P / water purification {{custom_keyword}} /
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