First, waste plastic sewage water quality
Wastewater is the main source of pollution in the recycling process of waste plastics, waste plastic cleaning, separation and wet crushing processes. The concentration of pollutants in wastewater is closely related to the nature of the waste plastics used in its production. If it is a coarse material containing a lot of debris, which contains many paper, soil particles and other debris, and is a variety of types of plastics, its wastewater production is also relatively large, can reach 10t /t waste plastic, the wastewater produced by its cleaning and crushing process, organic matter, suspended solids content is high, of which COD can reach 2000mg/m3, and SS can reach 500mg/m3.
Second, waste plastic sewage treatment equipment process debugging
In the early stage of process debugging of waste plastic cleaning and sewage treatment equipment, the active anaerobic bacteria in the natural anaerobic tank of the cleaning and sewage treatment project are selected for inoculation and culture, the water intake is controlled, the stage is increased, the biological phase is observed regularly, the growth of the microbial group is kept understood, and the water inlet and aeration amount are adjusted in time. In the whole project operation, the key to the treatment effect lies in whether the air flotation treatment process is operating normally; the sewage removal mainly relies on aerobic biological treatment; and the strengthening of concrete treatment ensures that the effluent meets the standards. After more than a year of actual operation of the project, the whole treatment system is stable and the treatment effect is good, and the effluent water quality indicators meet and exceed the emission standards required by the design.
The wastewater produced by using different raw materials varies greatly, and the biochemical properties are generally not very good. If the cleaning wastewater generated by the waste plastic cleaning and granulation industry can enter the sewage pipe network and be sent to the sewage treatment plant for unified treatment, the wastewater generated by it can be treated by itself to meet the three-level standard of the "Comprehensive Sewage Discharge Standard" (GB38978-1996) and then included in the unified treatment of the sewage treatment plant in the industrial zone, and the cost of wastewater treatment and treatment will be reduced, and the impact on the water environment will be greatly reduced. However, if the sewage pipe network in the industrial area is blocked due to accidental discharge or leakage discharge by enterprises, and the image of the ecological demonstration park in the industrial park is eventually destroyed, it will not be worth the loss. Therefore, zui's good measure is to choose a reasonable process to treat the waste plastic cleaning wastewater and reuse it, and try not to drain it.
Third, the composition of waste plastic sewage treatment equipment
Air flotation machine: air flotation system set water, flocculation, separation, water collection, water outlet in one, similar to the traditional air flotation equipment, with a steady flow chamber, dissolved gas release chamber, so that the processing performance is more stable, the effect is more superior.
Dissolved gas system: for industrial sewage treatment equipment air flotation equipment, the dissolved gas system is like the "heart" of the air flotation equipment, but also the main component of the air flotation equipment, at this stage, the gas and water are sucked together at the inlet of the pump, mixed into dissolved gas water by shear and pressurized, the gas and liquid phases are fully mixed and saturated, the gas content of the whole set of dissolved gas system is up to 10%, and the solubility of the gas is 100%, so that the microbubbles when the gas is dispersed are evenly distributed, and the average bubble diameter is less than 30um.
Scraper: The operation mode and speed of the scraper directly affect the water quality of the air floating water and the solids content of the sludge.
Fourth, the advantages of waste plastic sewage treatment equipment
1, large processing capacity, high efficiency, small footprint.
2, the process and equipment structure is simple, easy to use, maintenance.
3, can eliminate sludge expansion.
4. Aeration to the water has obvious effect on removing the surfactant and odor in the water, and at the same time, due to the aeration, it increases the dissolved oxygen in the water, which provides favorable conditions for subsequent treatment.
5, plastic sewage equipment for low temperature, low turbidity, air flotation technology in recent years is widely used in water supply and drainage and wastewater treatment, it can effectively remove the wastewater is difficult to precipitate floating floc.
Fifth, the application scope of waste plastic sewage treatment equipment
All kinds of plastic packaging, shopping bags, agricultural film, woven bags, beverage bottles, plastic basins, plastic pots, plastic barrels, toys, stationery, plastic shoes, vehicle bumpers, household appliance shells, computer shells, waste polychlorine tubes, industrial waste plastic products, plastic doors and windows, polyurethane products (polyurethane film, mineral water bottles, cola bottles, etc.), waste plastic molding processing, cleaning, crushing, recycling process of sewage.
Integrated sewage treatment equipment - rural sewage treatment equipment manufacturers - Shandong Mengzhi clean water treatment equipment Co., Ltd