Since the reform and development, China's economy has experienced rapid growth, but it has been accompanied by a severe environmental pollution situation. Due to the relatively backward environmental awareness and environmental governance technology in our country, coupled with the bottomless and untreated direct discharge of organic wastewater from key polluting heavy industry enterprises, and the lagging construction of municipal sewage pipe networks, the situation of urban acceptance of water pollution is becoming increasingly serious. Chemical oxygen demand in polluted water bodiesCODTheNThePWhen the concentration of pollutants seriously exceeds the standard, it causes eutrophication of the water bodies in river cities, directly leading to seasonal or even year-round black and odorous water conditions. At present, there is a lot of research on black and odorous water bodies, especially in urban areas.

The basic status quo of black and odorous water bodies in China

according to2016Annual data shows nationwide1940Assessment section is inferiorVProportion of classes9.2%; 24.6%Key lakes and reservoirs are showing eutrophication;The majority of rivers and ditches flowing through towns are in a black and odorous state(as of10moon23Daily recognition of black and odorous water bodies1915a);groundwater4778Number of monitoring points, with poor water quality accounting for43.9%The proportion of extremely poor15.7; nineA bay6The water quality is poor and extremely poor;The proportion of qualified drinking water quality to the total water intake97.3%;Water pollution presents regional, watershed, and composite patterns, as well as water resource scarcity and water environmental capacity(pollution capacity)Serious deficiencies in features. as of2016year11moon7The number of black and odorous water bodies identified by the "platform" announced on the day is1951Among them, those who have completed governance51One, completed the plan formulation1146One, in governance396One, not yet started322a;The regions with a high number of complaints about black and odorous water pollution are Shandong, Liaoning, Beijing, Hunan, Anhui, etc. Currently, no province has fully completed its governance tasks.2016The Ministry of Environmental Protection44Announcement No. Announcement: During the 13th Five Year Plan period nationwide343A list of national control units for water quality improvement, involving29A province(Directly administered municipalities and autonomous regions)197A prefecture level city965A county(District, city);According to the water quality targets stipulated in the "Ten Measures for Water Quality", until2020In the year,167A bad oneVEliminate all class' control units',49Improved the 'control unit' toIVClass,124Improvement toIIIClass,3An improvementIIClass, the water quality of other units cannot deteriorate, and the category cannot be lowered;2016to2020The water quality sections that need to be improved annually are:33、45、59、75、131.

According to statistics, China's black and odorous water bodies are severely polluted, and the country is actively promoting the treatment of black and odorous water bodies1900Multiple black and odorous bodies of water, only less than400According to the governance goals of the "Ten Measures for Water": to2020In the year, the water environment quality in China has been improved in stages, with a significant reduction in severely polluted water bodies. The water ecological environment in regions such as Beijing Tianjin Hebei, Yangtze River Delta, and Pearl River Delta has also improved. So in the future3During the year, the remediation of black and odorous water bodies is of paramount importance in water environment management.

Technical measures taken for various reasons

Causes of black and odorous emissions: direct discharge of sewage, non-point source pollution, etc;Internal pollution: release from sediment;Poor self-cleaning ability;Lack of long-term mechanisms.

Measures for direct discharge of sewage treatment: ① Sewage interception and collection pipe: End interception or source interception;② In situ treatment of sewage from direct discharge outlet;③ Integrated bypass equipment processing. Regarding non-point source control and governance measures: ① Sponge city measures: vegetation buffer zones, rain gardens, etc;② Initial mixed water storage tank;③ Artificial wetland. Measures for controlling endogenous pollution: ① dredging and dredging;② Biological bottom modification;③ Cleaning of aquatic plant residues;Measures to address poor self-cleaning ability: ① Artificial oxygenation;② Coagulation sedimentation;③ Microbial enhanced purification;④ Ecological floating island;⑤ Construction of aquatic ecosystems;⑥ Control of harmful algal blooms;⑦ Restoration of aquatic organisms;⑧ Supply with clean water or recycled water. Measures to address the lack of long-term mechanisms: ① Strengthen water management, implement the "river chief system", and implement "one river, one policy";② Payment for water quality performance assessment;③ Eliminate illegal discharge of sewage. ④ Establish a sound monitoring system

Guangzhou Lvye Environmental Protection Equipment Co., Ltd