Department of Applied Environmental Science, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea.
Department of Environmental Science and Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea.
Chemosphere. 2019 Jul;226:625-635. doi: 10.1016/j.chemosphere.2019.03.085. Epub 2019 Mar 29.
Selection of an appropriate biochar as a soil amendment requires a thorough investigation of the effects on soil ecosystems and adjacent water systems via leaching. Different biochar characteristics influence retention or leaching of different soil and biochar components. A lab lysimeter study was conducted to investigate carbon (C) balance and leachate quality with biochar additions. Biochar made from wood pellets (WP) and sewage sludge (SS) produced at 400 °C (WP400 and SS400) and 700 °C (WP700 and SS700), respectively, were applied to silt loam soil at an application rate of 4%. Fluorescence excitation-emission spectrophotometry (EEMs) was utilized to understand the compositional changes in leachate dissolved organic carbon (DOC). Our results show that DOC contributed the largest portion of C leaching loss. The WP treatments increased DOC mass loss, but did not significantly change leachate DOC quality. SS400, in comparison, increased mass loss of DOC and SS700 decreased it probably due to its higher adsorptive capacity to DOC. Unlike WP treatments, SS treatments significantly changed leachate DOC quality. Chemical oxygen demand (COD) was reduced with SS400 and SS700 biochar additions, which is assumed to be related to SS biochar's high oxygen-containing surface functional groups. Reduction in total nitrogen (TN) leaching by WP700 and SS700 treatments might be related to the higher micropore surface area. Over all, our findings imply that changes in the different components of the leachate from biochar-amended soil are related to different biochar properties, such as labile matter content, total surface area, micropore volume and cation exchange capacity.
选择合适的生物炭作为土壤改良剂需要通过淋溶来彻底研究其对土壤生态系统和相邻水系的影响。不同生物炭特性会影响不同土壤和生物炭成分的保留或淋溶。进行了一项实验室淋溶仪研究，以调查添加生物炭后碳 (C) 平衡和浸出液质量。分别由木屑颗粒 (WP) 和污水污泥 (SS) 在 400°C (WP400 和 SS400) 和 700°C (WP700 和 SS700) 下制成的生物炭，以 4%的施用量应用于粉壤土。荧光激发-发射分光光度法 (EEMs) 用于了解浸出液溶解有机碳 (DOC) 的组成变化。我们的结果表明，DOC 是 C 淋失损失的最大组成部分。WP 处理增加了 DOC 质量损失，但并未显著改变浸出液 DOC 质量。相比之下，SS400 增加了 DOC 的质量损失，而 SS700 减少了 DOC 的质量损失，这可能是由于其对 DOC 具有更高的吸附能力。与 WP 处理不同，SS 处理显著改变了浸出液 DOC 质量。添加 SS400 和 SS700 生物炭降低了化学需氧量 (COD)，这被认为与 SS 生物炭的高含氧表面官能团有关。WP700 和 SS700 处理减少了总氮 (TN) 的淋失，这可能与较高的微孔表面积有关。总的来说，我们的研究结果表明，生物炭改良土壤浸出液中不同成分的变化与生物炭的不同特性有关，例如易分解物质含量、总表面积、微孔体积和阳离子交换能力。
