Improving the efficiency of flushing of barometric pulse method, it has the important theoretical and practical significance to reduce secondary pollution in water supply network.
提高气压脉冲法的冲洗效率，对减少管网水质的二次污染有重要的理论和实际意义。
How to avoid the disturbance of chloride, improve the repeatability and accuracy and reduce secondary pollution is a problem deserving attention from large environmental monitoring workers.
如何消除氯离子的干扰，提高COD测定的重复性和准确度，同时减轻二次污染，是广大环境监测者非常关注的问题。
Comprehensive recovery of these metals not only can gain economic benefits for mines, but also reduce pollution of tailings to environment. The tailings are precious secondary resources.
综合回收这些金属，既可以为矿山创造经济效益，同时减少了尾矿对环境的污染，是宝贵的二次资源。
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