Affiliation:
1. Huadong Eco‐Environmental Engineering Research Institute of Zhejiang Province Hangzhou Zhejiang China
2. Power China Huadong Engineering Corporation Limited Hangzhou Zhejiang China
3. National Center of Comprehensive Survey for Natural Resources China Geological Survey Beijing China
4. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing China
5. Department of Water Ecology and Environment China Institute of Water Resources and Hydropower Research Beijing China
6. Hebei Center for Ecological and Environmental Geology Research Hebei Geo University Shijiazhuang China
7. School of Water Resources and Environment Hebei Geo University Shijiazhuang China
Abstract
AbstractRoot channel wetlands, as a new type of nature‐imitating wetland system, provide a paradigm for micro‐polluted water source purification; however, there is a knowledge gap on root channel wetlands' pollution removal effects and their main influencing factors after longtime operation. This study collected the turbidity, ammonia nitrogen (NH3‐N), total nitrogen (TN), total phosphorus (TP), permanganate index (CODMn), dissolved oxygen (DO), and chemical oxygen demand (COD) at the inlet and outlet of Shijiuyang (SJY) wetland and Guanjinggang (GJG) wetland in Jiaxing City, China, from 2019 to 2021. The results showed that root channel wetlands had better water quality improvement effects. The SJY wetland had larger removal rates for DO, CODMn, and turbidity compared with the GJG wetland. In contrast, other water quality indexes have similar removal rates at both wetlands. The influencing factor analysis showed that water purification agent, flow, pH, and water temperature have large influences on the removal rates of pollutants for both wetlands. To address high turbidity and excessive DO, which are the primary pollutants affecting the two wetlands, implementing the diversion river before the pretreatment area and incorporating ecological floating beds in the deep purification area are recommended solutions to mitigate these issues. Compared with conventional general constructed wetlands, root channel wetlands are a more cost‐effective and sustainable technology. The research is conducive to improving understanding of root channel wetland purification for micro‐polluted water sources and enhancing water supply security capability in the plains water network area of the Yangtze River Delta region.Practitioner Points
Compared with conventional general constructed wetlands, root channel wetlands are more cost‐effective and sustainable technology.
The SJY wetland demonstrated better removal rates for DO, CODMn, and turbidity, indicating a higher purification capacity compared to GJG wetland.
Flow rate and pH are the primary factors influencing the GJG wetland, while the waterpurification agent and water temperature are the main factors affecting water quality in the SJY wetland.
Funder
POWERCHINA Huadong Engineering Corporation