ZHAOQing,HUANGPeng,LIHe-nan,et al.Ecological Restoration Performance of Aquatic Plants Based on DO and ORP Consideration[J].China Water & Wastewater,2023,39(5):94-100.
Ecological Restoration Performance of Aquatic Plants Based on DO and ORP Consideration
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第5期
Page:
94-100
Column:
Date of publication:
2023-03-01
- Abstract:
- At present, preliminary progress has been made in the restoration of urban black and odorous water bodies in China. The implementation of water ecological restoration has become an important measure to achieve the goal of long-term clean-up of urban water bodies, of which aquatic plants play an important role in improving dissolved oxygen (DO) and oxidation reduction potential (ORP) of water bodies. However, in practical projects, there are widespread problems such as unclear functional characteristics of aquatic plant for ecological restoration and great blindness in plant selection. The highly respected “ecological floating island” is difficult to support the objective of water restoration independently. Based on this, the characteristics of oxygen released from emergent plants, submerged plants, floating plants (including “floating island” plants) and floating-leaved plants were tested, and the changes of DO and ORP in upper and lower water bodies over time were observed under the condition of natural light. The submerged plants had the best performance of increasing oxygen, mainly relying on leaves to increase the DO in water. By contrast, other aquatic plants only released oxygen to the water through roots, and the oxygen increasing performance was weak. The increase of DO released from submerged plants to the upper water body was 7.4 times, 4.1 times, 14.8 times and 11.6 times of that of emergent plants, floating plants, “floating island” plants and floating-leaved plants, respectively. Except for “floating island” plants, the other four aquatic plants all had a good ability to maintain ORP in the water bodies, and the submerged plants in particular increased the ORP in the upper water body by approximately 200 mV. In conclusion, urban water ecological restoration can be carried out by adopting a lot of submerged plants combined with a small amount of other aquatic plants when DO and ORP are used as assessment indicators.
Last Update:
2023-03-01