River enclosure pollution prevention and water diversion in-situ purification treatment method and system

Abstract

The invention relates to a river enclosure pollution prevention and water diversion in-situ purification treatment method and system. The method comprises the following steps: rapidly and completely intercepting sewage at a drain outlet by utilizing a pollution prevention enclosure device, forming a pollution prevention and water diversion purification tank on a riparian zone, performing in-situ purification on the sewage in the pollution prevention and water diversion purification tank in the diversion process by utilizing a bottom micro-porous aeration device and floating plants, guiding the sewage into a centralized sewage purification area on the downstream, performing strengthened purification, and eliminating pollutants, so that complete pollution prevention and water quality improvement of a main river control section can be realized. According to the method and system disclosed by the invention, river water does not need to be pumped up during construction, and river black and odor causing substances and pollutants such as nitrogen, phosphorus and the like can be rapidly and completely intercepted and treated in a centralized manner. The method and the system are applicable to black-odor river control projects for directly discharging domestic sewage on two banks along the river and agricultural wastewater in towns and villages.

Description

technical field [0001] The invention belongs to the technical fields of sewage treatment, ecological restoration, etc., and specifically relates to in-situ purification technology and ecological restoration technology of black and odorous rivers. Background technique [0002] The water environment quality of my country's rivers has declined sharply in the past 20 years. The water quality of most rivers is inferior to Class V. Water pollution and ecological degradation are very serious. Perennial black and odorous water phenomenon. This not only hinders the sustainable development of economy and society, but also seriously affects the health and life of coastal residents. Eliminating the black and odorous phenomenon of the river and restoring the ecological function of the river has become one of the key tasks in the process of social sustainable development. [0003] In recent years, my country has attached great importance to the treatment of black and odorous rivers, and ...

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Problems solved by technology

[0003] In recent years, my country has attached great importance to the treatment of black and odorous rivers, and is committed to the research and practice of treatment technologies. At present, the main river treatment technologies in my country are: physical methods, including artificial aeration, sediment dredging and water diversion, etc., through Improve water oxidation, control endogenous pollution and dilute pollutants to alleviate water black and odor, but can not guarantee long-term stable improvement of water quality; chemical methods mainly include flocculation, chemical oxidation, etc., such as the use of iron salt and aluminum salt coagulant can Effectively improve water transparency and absorb dissolved phosphorus, CaO 2 , MgO 2 It can increase dissolved oxygen, contribute to the degradation of organic matter and the conversion of ammonia nitrogen, and alleviate the release of phosphorus from the sediment to the overlying water. This method is used in patent 201610320572.7. In patent document 201610076802.X, a nano-bubble machine is used to provide dissolved oxygen , the particle size of the generated bubbles is very small, which hardly disturbs the water body, and the generated bubbles can be attached to the surface of the sediment, and the oxygen mass transfer rate is high; the biological-ecological method, patent document 201510845266.0, hangs a film on the early carbon fiber ecological grass, and The cultured indigenous microorganisms are sprayed at the beginning of different water sections of the black and odorous river course. This is the use of biofilm technology and microbial enhancement technology. The microorganisms on the biofilm can absorb and degrade pollutants and promote the chemical reaction process of pollutants. The patented invention 201610006876.6 provides a method for constructing a stable submerged vegetation community, using the combination of Elodea-Littleweed to establish evergreen submerged vegetation, and planting companion species such as hornwort, Helicopteris spicosa, and Hydra verticillium, And adopt the lifting type floating bed, the depth of the floating bed can be adjusted according to the transparency of the water body. This is the use of plant purification technology. At present, the widely used technologies include aquatic plant oxidation pond, ecological floating bed, etc.

[0004] However, at present, most of the patented technologies for river treatment focus on in-situ purification and repair, and there are few technologies for diversion, interception and disposal of exogenous pollutants. Patent document 201510847564.3 involves the diversion and purification of sewage entering the river. According to the location, it is divided into sewage diversion and collection area, sewage deep purification area, water ecosystem construction and water quality purification area, and treatment measures are taken for the three areas respectively. The sewage diversion and collection area is wide on both sides of the river. The area of ​​0.5 ~ 2m uses PVC microporous membrane to collect and divert sewage, but the use of PVC microporous membrane is easy to cause blockage, needs to be replaced frequently, and the service life is not long, and the specific laying and connection of pipelines are not detailed.

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