Black and smelly water governance should follow the "external emission reduction, endogenous dredging, water purification, water supply, ecological restoration" of the technical route. Exogenous emission reduction and endogenous dredging is the foundation and premise, water purification is a phased approach, hydrodynamic improvement technology and ecological restoration is a long-term safeguard measures.
First, exogenous blocking technology.
Including the city intercept pipe and non-point source control of two cases. For the water body lacking the perfect sewage collection system, the sewage interception should be incorporated into the sewage collection and treatment system by constructing and rebuilding the sewage pipeline along the water body to reduce the direct discharge of pollutants from the source. Sewage pollution that is unconditionally blocked may be treated in situ with a highly efficient wastewater treatment technology or technology to avoid direct pollution of the water body. Urban non-point source pollution control technologies include low-impact urban development (such as sponge city) technology, initial rainwater control technology and ecological revetment technology. Cleanup of garbage around the water is an important source of pollution control measures.
Second, endogenous control technology.
That dredging dredging technology, there are usually two: one is pumping dry lake / river dredging; the other is the dredging silt directly from the water. The latter has a wide range of applications. Dredging can improve the water quality relatively quickly, but the dredging process easily leads to a large amount of pollutants entering the water body due to the disturbance, affecting the stability of the water ecosystem and having certain ecological risk.
Third, water purification technology.
City black stink water body water purification technologies include: artificial aeration oxygenation, flocculation sedimentation technology, constructed wetland technology, ecological floating island, stable pond and so on. Germany Sal River, the British Thames, the Swan River in Australia, China's Suzhou River and other governance have adopted the method of aeration and aeration.
Fourth, hydrodynamic improvement technology.
The technology is effective for the treatment of urban black-odor water bodies with high pollutant load, insufficient hydrodynamic force and low environmental capacity. But calling clean water to improve river water quality should try to use unconventional water sources, at the same time in the process of water diversion to prevent the introduction of new sources of pollution.
Fifth, ecological restoration technology.
Including urban river eutrophication control (the key is the control of phosphorus) technology, artificial growth control of algae, and water ecological restoration technology.
In our country landscape water body repair is the most widely used and effective artificial reoxygenation technology.
The treatment technologies for urban black-odor water body mainly include: physical type technology, bioremediation technology and artificial reoxygenation technology.
Physical technologies include interception sewage, water transfer, dredging and other water conservancy projects. These three kinds of physical technologies are widely used at home and abroad, and played a good role. However, all three technologies are subject to the relevant conditions, thus affecting the pollution control effect. Such as "sewage interception" need to have a sound sewage pipe network and sewage treatment plant, "water" requires adequate water resources, "dredging" need to achieve effective control of external pollution sources to avoid subsequent siltation.
Plastic Film Extrusion Machine
1. This production line is composed of a thermoforming machine and an automatic punching, punching, cutting and stacking machine in line with a multifunctional integrated machine, which realizes the realization of a variety of disposable plastic perforated fruit and vegetable boxes, trays, cup lids, and porous products after forming. Continuous production with efficient automatic punching, punching, counting and stacking. The unit is characterized by independent operation and use.
2. The whole line adopts servo motor drive and PLC programming automatic control, which realizes one-stop production with high efficiency of punching and positioning.
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