Environ Technol. 2014 Sep-Oct;35(17-20):2466-75. doi: 10.1080/09593330.2014.910557.
Biodegradation of alpha-pinene was investigated in a biological thermophilic trickling filter, using a lava rock and polymer beads mixture as packing material. Partition coefficient (PC) between alpha-pinene and the polymeric material (Hytrel G3548 L) was measured at 50 degrees C. PCs of 57 and 846 were obtained between the polymer and either the water or the gas phase, respectively. BTF experiments were conducted under continuous load feeding. The effect of yeast extract (YE) addition in the recirculating nutrient medium was evaluated. There was a positive relationship between alpha-pinene biodegradation, CO2 production and YE addition. A maximum elimination capacity (ECmax) of 98.9 g m(-3) h(-1) was obtained for an alpha-pinene loading rate of about 121 g m(-3) h(-1) in the presence of 1 g L(-1) YE. The ECmax was reduced by half in the absence of YE. It was also found that a decrease in the liquid flow rate enhances alpha-pinene biodegradation by increasing the ECmax up to 103 gm(-3) h(-1) with a removal efficiency close to 90%. The impact of short-term shock-loads (6 h) was tested under different process conditions. Increasing the pollutant load either 10- or 20-fold resulted in a sudden drop in the BTF's removal capacity, although this effect was attenuated in the presence of YE.
采用火山岩和聚合物珠混合物作为填充材料，在生物高温滴滤器中研究了 α-蒎烯的生物降解。在 50°C 下测量了 α-蒎烯与聚合物材料（Hytrel G3548 L）之间的分配系数（PC）。聚合物与水或气相之间的 PC 值分别为 57 和 846。BTF 实验在连续负荷进料下进行。评估了在循环营养培养基中添加酵母提取物（YE）的效果。α-蒎烯生物降解、CO2 产生和 YE 添加之间呈正相关。在 1 g L-1 YE 的存在下，α-蒎烯的加载速率约为 121 g m-3 h-1 时，获得了 98.9 g m-3 h-1 的最大消除容量（ECmax）。在没有 YE 的情况下，ECmax 降低了一半。还发现，降低液体流速可通过提高 ECmax 至 103 gm-3 h-1 来增强 α-蒎烯的生物降解，去除效率接近 90%。在不同的工艺条件下测试了短期冲击负荷（6 h）的影响。无论是将污染物负荷增加 10 倍还是 20 倍，都会导致 BTF 的去除能力突然下降，但在 YE 的存在下，这种影响会减弱。
