The first level of treatment, belonging to the physical treatment, the main removal of sewage in a suspended state of solid pollutants, most of the physical treatment method can only complete the requirements of the first level of treatment. After primary treatment of sewage, BOD can generally remove about 30%, not up to the discharge standard. Primary treatment belongs to the pretreatment of secondary treatment.
Secondary treatment, the main removal of sewage in the colloidal and dissolved state of organic pollutants (BOD, COD substances), the removal rate of up to 90% or more, so that organic pollutants to meet the discharge standards.
Tertiary treatment, further treatment of difficult to degrade organic matter, nitrogen and phosphorus can lead to eutrophication of the water body, such as soluble inorganic substances. The main methods include biological nitrogen and phosphorus removal, coagulation and precipitation, sand filtration, activated carbon adsorption, ion exchange and electro-osmosis analysis.
The whole process is through the coarse grating of raw sewage through the sewage lifting pump lift, flow through the grating or sand filter, and then enter the sand sedimentation tank, after sand and water separation of sewage into the initial sedimentation tank, the above is the first level of treatment, the effluent of the initial sedimentation tank into the biological treatment equipment, there are activated sludge and biofilm method, (which activated sludge method of the reactor has aeration tank, oxidation ditch, etc., and the biofilm method include) Biofilter, biological rotary table, biological contact oxidation and biofluidized bed), the effluent of the biological treatment equipment into the secondary sedimentation tank, the effluent of the secondary sedimentation tank after disinfection and discharge or into the tertiary treatment, the end of the primary treatment to the end of the secondary treatment, the tertiary treatment, including biological nitrogen and phosphorus removal, coagulation and sedimentation method, sand filtration, activated carbon adsorption, ion exchange and electrodialysis method. Part of the sludge from the secondary sedimentation tank is returned to the primary sedimentation tank or biological treatment equipment, and part of it enters the sludge thickening tank, and after that it enters the sludge digesting tank, and after the dewatering and drying equipment, the sludge is finally utilized.
Baoding Yinhong Yurui Water Equipment Manufacturing Co., Ltd. is an engineering enterprise focusing on agricultural water-saving irrigation, improvement of urban and rural water supply, research and development of urban and rural water environment development and governance and atmospheric governance. The company has strong financial strength, now has municipal three, water conservancy and hydropower three, environmental protection three, construction three, highway three, electromechanical installation three and many other operating qualifications, basically can undertake all kinds of large and medium-sized water engineering business. At the same time, the company has established and perfected a set of efficient operation system, relying on the Internet platform, the use of remote control technology, realizing the real-time monitoring of engineering projects.