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| Rural low-pollution wastewater purification in Oenanthe Javanica wetland with biochar addition |
| Received:July 29, 2016 |
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| KeyWord:biochar;low-pollution wastewater;Oenanthe javanica;ammonia volatilization;leaching |
| Author Name | Affiliation | E-mail | | DUAN Jing-jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Li-hong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | YIN Ai-jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | FENG Yan-fang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | lzyang@issas.ac.cn | | YANG Lin-zhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Synthetic Innovation Center for Coastal Bio-agriculture, Yancheng 224002, China | |
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| Abstract: |
| 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℃ or 700℃(500℃-1%, 500℃-5%, 700℃-1% and 700℃-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℃-1% and 700℃-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℃-1% treatment, which was significantly higher than other treatments. The amount of ammonia volatilization was relatively low in 700℃-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℃ 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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