Abstract
Drainage from farmland contains a lot of nitrogen and phosphorus, it is one of the important causes of water eutrophication. In order to reduce the concentration of nutrients before it discharged into receiving waters, 7 aquatic plants were selected to plant in outdoor planting box in the experiment, 5 different aquatic plant combinations were constructed, the removal effect of different combination was studied under same conditions, the reduction rule was researched, and the nitrogen and phosphorus in sediment were investigated. The results showed: after 49 days, the purifying effect of aquatic plants was significantly higher than that with no plant. Among them, the combination with Lythrum salicaria, Reed, Canna has the best effect in TN and TP removal, the removal rate reach: 90.98%, 95.95%, 98.46% respectively. Reductive process of total nitrogen, ammonia nitrogen and total phosphorus in water are accord with polynomial regression, the concentration decreased along with time increasing. When initial nitrogen and phosphorus content in sediment is higher, nitrogen and phosphorus in the sediment will decrease because of plants absorbing; whereas the initial sediment nitrogen and phosphorus content is low, nitrogen and phosphorus in the water can transfer into the sediment, at the same time, the water was purified.
Highlights
Large amounts of nitrogen and phosphorus in farmland drainage has become an important source of eutrophication pollution
Research on aquatic plants used to water purification mainly focused on a single plant individual or community, the tests have shown that the purification role of aquatic plants is efficient or effective [4-6]
Due to the different purification advantages of different aquatic plants, several aquatic plants planted together to be a combination in favor of complementarily between plants, to increase N and P removal rate
Summary
Large amounts of nitrogen and phosphorus in farmland drainage has become an important source of eutrophication pollution. Experimental research on the removal of nitrogen, phosphorus and other pollution elements by aquatic combination systems, analyzing its removal efficiency of nitrogen and phosphorus in water and soil, and compare it with the treatment with no plant to study the contribution rate of plants on nitrogen and phosphorus removal, and to determine the best combination. It can provide a theoretical basis for the comprehensive management of water environment
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