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| Effect of Biochar on Interception of Sewage Nitrogen, Phosphorus and COD |
| Received:January 26, 2015 |
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| KeyWord:biochar;soil;TN;TP;COD;infiltration rate;interception rate;interception amount |
| Author Name | Affiliation | E-mail | | ZHANG Guang-ke | The Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | DENG Chun-sheng | The Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | beauveria@vip.sina.com | | ZHANG Yan-rong | The Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| Biochar has large surface area and great sorption ability and may be used to intercept pollutants in runoff. In this study, a soil column leaching experiment was carried out to examine the interception of exogenous nitrogen, phosphorus and COD by biochar added to cinnamon soil at different dry mass rates(2%, 4%, 8% and 16%). Higher biochar additions significantly improved the infiltration rates of sewage. At 10~12 L of inflow, the infiltration rates of the system had no significant difference at 2% and 4% biochar additions, but increased by 593.08% and 942.90% by biochar addition at 8% and 16%, respectively, as compared with CK. All biochar additions retained TN efficiently, with an average TN retention rate of 95.79%. The averaged retention rate of COD by the system was 54.14% at 2%~8% biochar, and 66.22% at 16% biochar. As sewage inflow increased, no significant differences in TN and COD concentrations in sewage effluent were observed, but the total amount of TN and COD removed increased in the treatments with 8% and 16% biochar. At 3~6 L of inflow, the TP concentrations in the effluent were higher than those in the influent at high biochar addition(8%, 16%), which was due to the releases of phosphorus in the biochar. As sewage inflow increased, however, the removal of TP in sewage increased in all treatments. At the end of the experiment, the retention rate of TP was 90% for 2% and 4%, 45.70% for 8%, and 20.71% for 16% biochar. Taking the infiltration rate and TN and TP removals into consideration, biochar at 8% intercepted more pollutants during a shorter time. The present research results provide a theoretical basis for constructing river bank vegetation buffer strip. |
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