State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China; Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China; Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China.
Bioresour Technol. 2014 Sep;168:252-8. doi: 10.1016/j.biortech.2014.02.080. Epub 2014 Mar 1.
Wood biochar (6%, 12% and 18% of fresh sludge weight) adding to a sludge-and-straw composting system was investigated to assess the potential of biochar as a composting amendment. Organic degradation efficiency, temporal humification profile of the water-extractable organic fraction and solid organic matter, through spectroscopic, microscopic and elementary analysis were monitored. Fluorescent excitation and emission matrix indicated that concentrations of aqueous fulvic-acid-like and humic-acid-like compounds were, respectively, 13-26% and 15-30% higher in the biochar-amended treatments, than those in the control without biochar-amended. On the first day of sludge aerobic incubation, the presence of biochar resulted in increased oxygen uptake rates of 21-37% due to its higher nano-porosity and surface area. SEM indicated that, in the biochar-amended sludge, the dense microstructure on the sludge surface disintegrated into fragments with organic fraction degraded and water lost. Results indicated that 12-18%w/w addition of wood biochar to sludge composting was recommended.
向污泥-秸秆堆肥系统中添加 6%、12%和 18%（按新鲜污泥重量计）的木质生物炭，以评估生物炭作为堆肥添加剂的潜力。监测了有机降解效率、水提有机部分和固体有机质的时间腐殖化特征，通过光谱、微观和元素分析。荧光激发和发射矩阵表明，在添加生物炭的处理中，水溶性富里酸和腐殖酸类化合物的浓度分别比未添加生物炭的对照高出 13-26%和 15-30%。在污泥好氧培养的第一天，由于其更高的纳米孔隙度和表面积，生物炭的存在导致氧气摄取率增加了 21-37%。SEM 表明，在添加生物炭的污泥中，污泥表面上的致密微观结构因有机部分降解和水分流失而分解成碎片。结果表明，建议向污泥堆肥中添加 12-18%（按湿重计）的木质生物炭。
