Ducktail Creek, a tributary of the Nandu River, flows through Haidian Island, Haikou City. In recent years, with the continuous expansion and development of cities, the discharge of domestic sewage from residents on both sides of the strait exceeds the capacity of the municipal pipe network, and the sewage overflows into the duck-tail creek, resulting in poor water quality and siltation of the river. This original creek has gradually become a "Smelly ditch". In February 2016, Ducktail Creek was exposed by CCTV as a black odorous water body.
The Meilan District of Haikou City has made up its mind to innovate its governance measures and adopted the “PPP+EPC+supervisory†model for duck tails to “cover both the symptoms and the root causesâ€. After the governance, the current Ducktail Creek is clear and rippling, and it is like a person in the painting.
In the process of governance, Haikou City is guided by Xi Jinping's ecological civilization thoughts. It always runs through and practices “Green Water Mountain is Jinshan Yinshan†“Shanshui Lintian Lake Grass is a life community†“Looking at the mountains, seeing the water, I remember the ecological concept of living in the homesickness, adopting water and land integration, classification, zoning, and phased management, and paying attention to both governance and management to ensure that the quality effect can only be better and can not be worse.
Ducktail Creek mainly adopts water source control such as source-controlled interception, endogenous dredging, live water flow and ecological restoration. Specifically, combined with the characteristics of the water body of Ducktail Creek, a relatively complete sewage interception and sewage collection system was established, and a new sewage pipeline was built 1210 meters. At the same time as the new sewage treatment plant was accelerated, the existing fresh water station on both sides of the river was used to arrange temporary water purification stations. Two sets of water discharged to the standard not only realize the recycling of water, but also realize the ecological hydration of Ducktail Creek. At the same time, after systematically and thoroughly inspecting the surrounding pipe network, law enforcement and rectification of the original wrong connection and disordered connection were carried out to solve the problem that sewage was directly discharged into the river through part of the rainwater discharge port to ensure the treatment effect.
In terms of endogenous dredging, the endogenous pollution of Ducktail Creek is mainly contaminated with sediment. To this end, Haikou City carried out dredging and dredging work on the Ducktail River. According to incomplete statistics, it cleared 145,000 square meters of contaminated sediment. The dredging work of contaminated sediments increases the hydrodynamic and water capacity of the river, ensuring smooth water flow and thus achieving self-purification.
In the process of treatment, not only the contaminated sediment but also the water body ecological restoration facilities such as aeration equipment and biological blankets are installed and put into use, and the pollutants in the water are degraded through the metabolism of microorganisms to realize the purification of water body and the self-purification ability. Not only that, Haikou City has also reconstructed the original canalization of the duck-tailed river, restored ecological revetment, planted mangroves, large-leaf oilseeds and other green plants. At the same time, it also arranged cushions along the coast to facilitate the leisure and entertainment of the citizens.
In the process of comprehensive management, we always adhere to the “five-one†working mechanism of river and lake management in Haikou City, namely “one river and one policyâ€, “one river and one mapâ€, “one river and one tableâ€, “one river group†and “one river oneâ€. "Working" mechanism to strengthen the management of water management work. The 12345 government hotline was used as a platform to establish a rapid response mechanism, which was quickly accepted within 30 minutes. The cruise river volunteer service team was formed to strengthen daily inspections and form a supervision system jointly managed by the government and the public.
After comprehensive management, at the beginning of 2018, Ducktail Creek completed construction tasks. According to the monitoring of Haikou City Ecological and Environmental Protection Bureau, the water quality of Ducktail Creek in 2018 is stable in the surface water V standard.
Editor in charge: Cao
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