The paper reports the hazard of much more content of Fe and Mn of water, the Fe-removing principle and result by natural Mn, operation caution and methods of extention service life.
分析了水中铁锰含量过多的危害，阐述天然锰砂的除铁原理、除铁效果、操作注意事项和延长使用寿命的方法。
2
The system normalizes the management form and content of occupational health management, and provides help and support for management and decision-making on occupational hazard of enterprises.
系统规范了企业职业危害管理的形式和内容，为企业的职业危害管理和辅助决策提供了技术支撑。
3
The core content establishing HSE management system is harmfulness identification and hazard evaluation .