Algae control in oligotrophic surface water under the joint effect of nutritional competition and microbial algae-lytic substance

Environmental Science Water Research & Technology ◽

10.1039/d1ew00563d ◽

2022 ◽

Author(s):

Xi-Yan Gao ◽

Wei Xie ◽

Zhi-Pei Liu

Keyword(s):

Surface Water ◽

Joint Effect ◽

Water Diversion ◽

Source Water ◽

Water Diversion Project ◽

North Water ◽

Algae Control

Harmful algal abnormal proliferation presents the most severe threat to the quality of oligotrophic surface water even in source water such as South-to-North Water Diversion Project in China. A novel...

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Water quality assessment of middle route of South-North water diversion project based on modified Nemerow index method

Water Science & Technology Water Supply ◽

10.2166/ws.2021.006 ◽

2021 ◽

Author(s):

Yilin Yang ◽

Dawei Zhang ◽

Jin Quan ◽

Pengwen Wang ◽

Yi Xu

Keyword(s):

Water Quality ◽

Quality Indicators ◽

Early Stage ◽

Water Quality Assessment ◽

Water Diversion ◽

Index Method ◽

Water Quality Indicators ◽

Water Diversion Project ◽

North Water

Abstract It is of great significance to find a scientific way to assess the water quality of the middle route of the South-North Water Diversion Project. In this paper, the spatio-temporal changes of the 26 water quality indicators in eight key monitoring stations along the middle route since the project was put into use were analyzed, and the modified Nemerow index method was employed to assess the water quality of the route in its early stage of operation. The results show that the water quality remained good in the period of study. Important water quality indicators were identified, including temperature, permanganate index, dissolved oxygen, total phosphorus, total nitrogen, mercury content, and density of planktonic algae. It is advised that potential ecological risks related to algae and shellfish reproduction in the open canal deserve special attention.

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A study on the phytoplankton community structure in the Diaohe River section of the Middle Route of the South-to-North Water Diversion Project in winter

Water Science & Technology Water Supply ◽

10.2166/ws.2020.247 ◽

2020 ◽

Author(s):

Yi Xu ◽

Jiankui Liang ◽

Junqiang Lin ◽

Xiaohui Lei ◽

Gongbo Ding ◽

...

Keyword(s):

Water Quality ◽

Phytoplankton Community ◽

Water Diversion ◽

Future Research ◽

River Section ◽

The South ◽

Water Diversion Project ◽

North Water ◽

Quality Indexes

Abstract As the first span and aqueduct of the Middle Route of the South-to-North Water Diversion Project, Diaohe Aqueduct has brought good engineering and social benefits since its completion. In order to understand the present water quality of the Diaohe River section of the route, four samplings were conducted at Diaohe Aqueduct in the winter of 2018. The main results of this study are as follows: 62 species (or variants) of phytoplankton belonging to 32 genera, 22 families and six phyla were identified during the study period, among which Bacillariophyta are the most dominant species. The identified phytoplankton fall into eight indicator grades: os; ps, αm; ps, αm, βm; αm; αm, βm; αm, βm, os; βm; and βm, os. A total of 17 functional groups are detected, among which TB is the absolute dominant functional group. Based on the composition characteristics of phytoplankton, the water quality trophic state of Diaohe Aqueduct is mesotrophic. However, other physical indexes show that the water quality of the Middle Route of the South-to-North Water Diversion Project is good. The conclusions drawn using phytoplankton alone as the evaluation index may not be comprehensive. In future research, how to build a comprehensive index system combining other water quality indexes for the Middle Route of the South-to-North Water Diversion Project needs yet to be improved and tested.

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