新沂市城市污水处理厂的污泥膨胀控制_环境工程论文_毕业论文天下网 关键词：污泥膨胀 污泥负荷 微量金属元素 SVI [gap=407]Key words: Sludge bulking; Mud load; Trace metal element; SVI
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The mass and trace metal element contents in the plant had to be measured in grade estimation of farm enviroment.
植株金属元素含量是农田环境质量评价中的必检项目。
Through investigation analysis it is confirmed finally that trace metal element lacks to cause the sludge bulking.
经过调查分析，最后确认污泥膨胀是由微量金属元素缺乏所致。
From the chemical composition, trace element, inoculation and thermal exchange of metal mold casting, the principle of chill formation and the effective methods for preventing chill were studied.
文章从铸铁的化学成分、微量元素、孕育处理及金属型的热交换方面叙述了产生白口的原理及防白口的有效方法。
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