摘要：

The pot cultivation experiment was conducted to study the purification performance for low-pollution wastewater and the impact on the plant growth in O. javanica wetland system coupling biochar addition. The treatment groups were designed as 1% or 5% addition amount of biochar calcined at 500°C or 700 °C(500 °C-1%, 500 °C-5%, 700 °C-1% and 700 °C-5%, respectively), while control groups were set without biochar addition. Each treatment had three replicates. The results showed that the average total nitrogen (TN) concentration of the surface water in treatments of 500 °C-1% and 700 °C-1% were 4.05~4.18 mg·L-1, lower than that of the control; however, the amount of ammonia volatilization loss was 96.07 kg·hm-2 in 500 °C-1% treatment, which was significantly higher than other treatments. The amount of ammonia volatilization was relatively low in 700 °C-1% treatment (43.02 kg·hm-2), and the plant aboveground biomass and nutrient accumulation were higher than other treatments. Biochar with calcination temperature 700 °C and 1% addition amount can also immobilize the soil nutrient to a certain extent. The wetland plant system with appropriate biochar addition seems to be a good measure in the purification of wastewater while reducing negative impacts on the environment and utilizing the nitrogen, phosphorus, and other nutrient efficiently.

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