Blue-green algae removal from the Zhongtang River channel
2025-03-04
This project provides a comprehensive management plan for the Zhongtang River, a residential‑area waterway in Panhuo Subdistrict, Yinzhou District. The river stretches approximately 12 kilometers in length, with a width of 30 to 40 meters and a depth of 1.5 to 3 meters, holding a year‑round water volume of about 1.2 million tons. It originates at the boundary between Hengtou Street and Dongqian Lake, flows westward to connect with the Meiliang River and Zhuangjia Creek, and extends eastward through Jishigang, Mai Mianqiao, and Wangchun Bridge. After merging with the Houtang River, it empties into Ximenkou in Ningbo City. As one of the key waterways traversing the western Yinzhou Plain and channeling water into Ningbo’s urban area, the Zhongtang River plays an essential role in regional water management.
Currently, the river’s water‑environmental issues are particularly acute: the water has turned yellowish‑green, eutrophication is severe, and algal blooms—particularly green algae and cyanobacteria—are rampant; dissolved oxygen levels are extremely low, with only a few fish and aquatic plants able to survive, leading to serious ecosystem degradation; sediment has accumulated on the riverbed, and debris occasionally rises to the surface. Adding to the challenge, influenced by the tides of the Fenghua River, the flow direction alternates between westward and eastward, creating highly variable conditions and greatly complicating conventional remediation approaches.
To address this series of persistent environmental issues, the project has deployed multiple ultra‑micro and nano‑bubble generation units along the river as a core measure for aquatic ecological restoration. These devices continuously and efficiently inject oxygen into the water body, rapidly elevating and sustaining dissolved oxygen levels at a high threshold, thereby fundamentally curbing algal blooms, accelerating the degradation of organic pollutants, and facilitating the gradual reestablishment of the aquatic biological community. With ample dissolved oxygen as the foundation, the initiative is driving the river from its former state of blackness, odor, and turbidity toward clarity and transparency, ultimately ensuring that water quality meets the relevant national surface‑water standards and restoring an ecological landscape characterized by “clear water, green banks, and swimming fish.”
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