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Assessment of hydro-mechanical properties of biochar-amended soil sourced from two contrasting feedstock
Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2020-08-09 , DOI: 10.1007/s13399-020-00946-0
Sanandam Bordoloi , Himanshu Kumar , Rojimul Hussain , Ravi Karangat , Peng Lin , Sekharan Sreedeep , Hong-Hu Zhu

In geo-environmental applications, the potential of biochar has been explored as a suitable cover material of landfill and vegetated slopes. The inherent nature of biochar affects the geo-environmental properties of the soil-biochar composite like water retention, compressive strength, infiltration, and soil erosion. Performance of a cover depends on biochar’s surface functional groups, which can be either hydrophobic or hydrophilic based on bio-source. The objective of this paper is to investigate the geotechnical properties of biochar-amended soil sourced from two contrasting feedstock, i.e., poultry litter (animal based) and water hyacinth (plant based). The test results show that biochar addition increased the Atterberg limits and reduced the acidity of soil. Biochar addition directly increased the optimum moisture content and decreased the maximum dry density. Both biochar addition decreased the composite compressive strength by 25–50% but increased the ductility of composite. Water hyacinth biochar (WHB) inclusion decreased the erosion rate of soil while it is not the same for poultry litter biochar (PLB). In the case of water retention, only the addition of WHB increases retention and holding capacity of soil. The obtained results have been discussed in context with the conducted microstructural, chemical, and physical tests on both biochar. Through these analyses on biochar of different origin and having contrasting functional groups and intra-pore network, the development of a complex biochar-water network was confirmed.



中文翻译:

两种对比原料来源的生物炭改良土壤的水力力学性能评估

在地质环境应用中,生物炭的潜力已被探索为垃圾掩埋场和植被坡的合适覆盖材料。生物炭的固有性质会影响土壤-生物炭复合材料的地球环境特性,例如保水率,抗压强度,渗透力和土壤侵蚀。覆盖物的性能取决于生物炭的表面官能团,基于生物来源,其可以是疏水的或亲水的。本文的目的是研究来源于两种相反的原料,即家禽垫料(基于动物)和水葫芦(基于植物)的生物炭改良土壤的岩土特性。测试结果表明,添加生物炭增加了阿特伯格限度并降低了土壤的酸度。添加生物炭直接增加了最佳水分含量,并降低了最大干密度。两种生物炭的加入都使复合材料的抗压强度降低了25–50%,但增加了复合材料的延展性。水葫芦生物炭(WHB)的加入降低了土壤的侵蚀速率,而家禽垃圾生物炭(PLB)则不同。在保水的情况下,仅添加WHB可以增加土壤的保水能力和保持能力。已针对两种生物炭进行了微结构,化学和物理测试,讨论了获得的结果。通过对不同来源的生物炭的分析,这些生物炭具有相反的官能团和孔内网络,从而证实了复杂的生物炭-水网络的发展。两种生物炭的加入都使复合材料的抗压强度降低了25–50%,但增加了复合材料的延展性。水葫芦生物炭(WHB)的加入降低了土壤的侵蚀速率,而家禽垃圾生物炭(PLB)则不同。在保水的情况下,仅添加WHB可以提高土壤的保水能力和保持能力。已针对两种生物炭进行了微结构,化学和物理测试,讨论了获得的结果。通过对不同来源的生物炭的分析,这些生物炭具有相反的官能团和孔内网络,从而证实了复杂的生物炭-水网络的发展。两种生物炭的加入都使复合材料的抗压强度降低了25–50%,但增加了复合材料的延展性。水葫芦生物炭(WHB)的加入降低了土壤的侵蚀速率,而家禽垃圾生物炭(PLB)则不同。在保水的情况下,仅添加WHB可以增加土壤的保水能力和保持能力。已针对两种生物炭进行了微结构,化学和物理测试,讨论了获得的结果。通过对不同来源的生物炭的分析,这些生物炭具有相反的官能团和孔内网络,从而证实了复杂的生物炭-水网络的发展。水葫芦生物炭(WHB)的加入降低了土壤的侵蚀速率,而家禽垃圾生物炭(PLB)则不同。在保水的情况下,仅添加WHB可以提高土壤的保水能力和保持能力。已针对两种生物炭进行了微结构,化学和物理测试,讨论了获得的结果。通过对不同来源的生物炭的分析,这些生物炭具有相反的官能团和孔内网络,从而证实了复杂的生物炭-水网络的发展。水葫芦生物炭(WHB)的加入降低了土壤的侵蚀速率,而家禽垃圾生物炭(PLB)则不同。在保水的情况下,仅添加WHB可以增加土壤的保水能力和保持能力。已针对两种生物炭进行了微结构,化学和物理测试,讨论了获得的结果。通过对不同来源的生物炭的分析,这些生物炭具有相反的官能团和孔内网络,从而证实了复杂的生物炭-水网络的发展。

更新日期:2020-08-09
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