College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
J Hazard Mater. 2016 Jan 15;301:106-18. doi: 10.1016/j.jhazmat.2015.08.060. Epub 2015 Sep 2.
This study investigated the performance of immobilized Phanerochaete chrysosporium loaded with nitrogen-doped TiO2 nanoparticles in the treatment of raw landfill leachate with a very low biodegradability ratio (BOD5/COD) of 0.09. The effects of various operating parameters, such as initial chemical oxygen demand (COD) concentration, pH, temperature, and biosorbent dosage, were evaluated with respect to the removal efficiency of total organic carbon (TOC) and ammonia nitrogen (NH3-N). For the immobilized biosorbents, an optimum pH of 6.0 for TOC and 7.0 for NH3-N were found suitable for TOC and NH3-N removal at temperature of 37°C, respectively. The most superior removal efficiencies of TOC and NH3-N of landfill leachate were over 75% and 74% in 72 h at an initial COD concentration of 200 mg L(-1), respectively. In addition, heavy metals were partly removed by the immobilized biosorbents during the process of landfill leachate treatment. The species and mass percentage of organic compounds in landfill leachate after the treatment were found to have considerably declined according to the gas chromatography coupled with mass spectrometry (GC-MS) system. These results indicate that the immobilized P. chrysosporium loaded with nitrogen-doped TiO2 nanoparticles could be a convenient and efficient method for the treatment of landfill leachate.
本研究考察了固定化 Phanerochaete chrysosporium 负载氮掺杂 TiO2 纳米粒子在处理原始垃圾渗滤液方面的性能，该渗滤液的可生化性比（BOD5/COD）非常低，仅为 0.09。考察了各种操作参数（如初始化学需氧量（COD）浓度、pH 值、温度和生物吸附剂用量）对总有机碳（TOC）和氨氮（NH3-N）去除效率的影响。对于固定化生物吸附剂，发现 TOC 的最佳 pH 值为 6.0，NH3-N 的最佳 pH 值为 7.0，温度分别为 37°C 时，TOC 和 NH3-N 的去除效果最佳。在初始 COD 浓度为 200 mg/L(-1)时，72 h 内对垃圾渗滤液的 TOC 和 NH3-N 的去除率分别超过 75%和 74%。此外，在处理垃圾渗滤液的过程中，固定化生物吸附剂还部分去除了重金属。根据气相色谱-质谱联用（GC-MS）系统，发现处理后垃圾渗滤液中有机化合物的种类和质量百分比有了明显下降。这些结果表明，负载氮掺杂 TiO2 纳米粒子的固定化 Phanerochaete chrysosporium 可作为处理垃圾渗滤液的一种简便、高效的方法。
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