Dali State Environmental Protection Bureau in late March, in recent years, Dali State in the implementation of the Erhai comprehensive management and protection process, "line surface combination" all-round pollution control, received significant results.
510 kilometers of pipe network to collect sewage
"Line" is the lake interception system and wetlands. At present, Dali has been built around the Erhai 18 kilometers of intercepting trunk sewers, 120 kilometers of intercepting trunk sewers, as well as 510 kilometers of sewage collection pipe network. Thus, the drainage network is not only relatively independent from the system, but also communicate with each other to form a body, maximize the sewage into the trunk pipe, and then into the sewage treatment plant for centralized treatment.
In recent years, Dali Prefecture to increase the erhai ecological restoration project construction efforts, *** investment of 250 million yuan, built in the erhai basin around the ecological wetlands of the Luoshijiang River, Mi Tho River inlet wetlands, ecological wetlands in the village of Gusheng, Hongshan Bay wetlands and other 13 wetlands, *** covers an area of 12,000 acres. These wetlands can not only treat and purify the surface runoff in the area, but also provide deep treatment for the tail water treated by the Village Sewage Treatment System and Integrated Sewage Treatment System to further cut down on nitrogen, phosphorus and other pollution factors.
Dali in addition to the construction of structural perfection, purification function strong multi-functional estuarine wetland, but also pay special attention to enter the wetland of sewage water quality improvement. Sewage entering the wetland through the river has previously been through the grease trap, anaerobic, precipitation and other pre-treatment processes, the purpose is to effectively improve the quality of sewage entering the wetland, thereby effectively reducing the purification load of the wetland, enhance the purification capacity.
Last year, the Erhai was listed as a national lake ecological environment protection pilot by the State Ministry of Finance and the Ministry of Environmental Protection, and issued an annual pilot fund of 200 million yuan. At present, the Erhai basin key town sewage collection and treatment, wetland ecological restoration and protection of 17 pilot projects are being fully implemented. The protection and management of the Erhai Sea has further established and improved a multi-level management model with the county and municipal administrative authorities of the basin as the main body. At the same time, Dali Prefecture to further improve the "river chief system", the implementation of state-level leaders linked system, the Erhai basin of the protection and management of the 33 major rivers into the lake to implement the responsibility to the person, section of the trunk.
Farmer sewage treatment facilities
Daily net 1850 tons of sewage
"Surface" is the rural production and living surface pollution management. For rural surface pollution management, in recent years, Dali Prefecture has been in the Erhai Lake Erbin village and other places to promote the 50 small garbage incinerators. Rural garbage is collected and transported to the treatment site, after manual sorting to remove non-combustible materials and recycling metals and glass, combustible garbage is transported into the incinerator.
Dali Prefecture has mobilized funds through multiple channels to promote the construction of 8,257 farmyard domestic sewage treatment facilities in Xizhou Town, Shangguan Town, Wanqiao Town, Dali Town and Xiaguan Town in the Erhai Basin. This kind of farmyard domestic sewage treatment system borrowed from Hunan is mainly used by a single household or several households***. It can directly implement grating, grease trap, anaerobic, sedimentation, gravel bed and other treatment and purification processes for the domestic sewage generated in the farmers' homes, so that the turbid sewage will eventually become clear water. The construction cost of each treatment system is only 2,500 yuan, which is easy for farmers to accept, and there is no energy consumption, no electricity, and easy to manage during the operation. Yang Jianxin, an engineer with the Dali Environmental Protection Bureau, said that the sewage treatment facilities built in the state's farm yards handle more than 1,850 cubic meters of domestic sewage per day, playing a big role in reducing surface pollution in the Erhai basin.
The Erhai Basin has made a breakthrough in the treatment of domestic sewage and garbage collection, transportation and disposal of garbage, and has accelerated the comprehensive remediation of Cangshan's eighteen streams and other rivers entering the lake. Eryuan County, green jade pool wetland protection and water pollution prevention and control project is being implemented, but also launched the implementation of the Dali in the stream, palm tree river sewage treatment and interception project and into the lake small ditch environmental remediation and purification project. Further deepen the "prize to promote governance" and "prize in lieu of subsidies" policy implementation, and solidly carry out the Erhai Basin, focusing on the comprehensive management of the rural environment, the Erhai Basin, focusing on the rural ecological environment has been significantly improved.
In the past three years, the water quality of the Erhai Sea has remained in the category of Ⅲ in general, and in many months it has even reached the category of Ⅱ, and the water quality of the Erhai Sea has remained in the category of Ⅲ for six consecutive years in a stable manner in general. Water quality in general to the direction of good development, the Erhai lake body self-purification capacity gradually enhanced, the transparency of the year by year some rebound. Today, the Erhai ecosystem is gradually restored, extinct for many years of China's Po Po Po, wheaten fish, stick flower fish, flash clams and back, Dali indigenous snails, toothless mussels have also been in the Erhai stocking success.