关键词： 伊乐藻；冬季；生长量；净化效果 ；克藻 [gap=5839]Key words: Elodea nuttallii; winter; growth; purification effect; allelopathic effect
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water quality purification effect 水质净化效果
purification effect along the way 沿程净化效果
Combination of two constructed wetlands have better purification effect of pollutants, after two-level treatment, can improve the removal rate of 20%-30%.
两级人工湿地组合对污染物有较好的净化效果,二级在一级人工湿地系统处理的基础上可以提高去除率20%～30%。
参考来源 - 人工湿地系统对污水处理厂二级出水净化实验研究With the development of purification technique, purification effect has been gradually improved.
随着熔体净化技术的不断发展，净化效果得到不断的提升。
参考来源 - 铝熔体电熔剂净化工艺的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Conclusion There is purification effect of low concentration ozone on indoor formaldehyde pollution.
结论低浓度臭氧对室内空气甲醛污染有净化效果。
Objective To understand purification effect of low concentration ozone on indoor formaldehyde pollution.
目的了解低浓度臭氧对室内空气甲醛污染的净化效果。
The purification effect of biological aerated filter stuffed with zeolite, haydite and volcanic rock for river water was studied.
以沸石、陶粒和火山岩曝气生物滤池为研究对象，研究了其对实际河水的净化效果。
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