Yin Gui Q, Liao Ping H, Lo Kwang V
Department of Civil Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2008 Feb;43(2):191-201. doi: 10.1080/10934520701781590.
A microwave-enhanced advanced oxidation process using hydrogen peroxide (MW/H(2)O(2)-AOP) was used for the release of nutrients and the destruction of solids from secondary municipal sewage sludge in this study. Using a computer statistical software package for designing experiments and for data analyses, four factors including microwave heating temperature, heating time, hydrogen peroxide dosage, and sludge solids content were examined. Experiments were performed at sludge solids content of 0.5, 1.5 and 2.5%, heating temperature of 80, 100 and 120 degrees C, heating time of 1.5, 3 and 9 minutes, and hydrogen peroxide dosage of 0, 1 and 2 wt %, respectively. Overall, the maximum solubilization of nutrients was obtained at 2.5% of total solids content, 2 wt % of hydrogen peroxide, 5 min. of microwave heating and at 120 degrees C. The most significant factor for the solubilization of nutrients using the microwave enhanced advanced oxidation process was the initial sludge concentration. Hydrogen peroxide dosage was also a very significant factor. The maximum yield occurred at an extended heating period of five minutes in this study. Nevertheless, the results indicated that the nutrient release and disintegration of solids were also very substantial over heating periods of 1.5 and 3 minutes. Even with a heating period of 1.5 minutes, the yield was estimated to be about 70% that of the 5 minute heating.
本研究采用微波强化过氧化氢高级氧化工艺（MW/H₂O₂-AOP）从城市二级污水污泥中释放养分并破坏固体物质。使用计算机统计软件包进行实验设计和数据分析，考察了微波加热温度、加热时间、过氧化氢投加量和污泥固体含量这四个因素。实验分别在污泥固体含量为0.5%、1.5%和2.5%，加热温度为80℃、100℃和120℃，加热时间为1.5分钟、3分钟和9分钟，以及过氧化氢投加量为0、1%和2%（质量分数）的条件下进行。总体而言，在总固体含量为2.5%、过氧化氢为2%（质量分数）、微波加热5分钟以及温度为120℃时，养分的最大溶解率得以实现。使用微波强化高级氧化工艺溶解养分时，最显著的因素是初始污泥浓度。过氧化氢投加量也是一个非常重要的因素。本研究中，在延长至5分钟的加热时间时达到最大产率。然而，结果表明，在1.5分钟和3分钟的加热时间内，养分释放和固体分解也相当可观。即使加热时间为1.5分钟，产率估计约为5分钟加热产率的70%。
