Magnetic purification system and purification method for quickly purifying combined overflow sewage

Abstract

The invention discloses a magnetic purification system and a purification method for quickly purifying combined overflow sewage. The magnetic purification system comprises a water storage device for containing the combined overflow sewage, a sewage lifting device arranged in the water storage device, a coarse grille device arranged at a water inlet of the water storage device, a fine grille devicearranged at a water outlet of the water storage device, a charging device for feeding a material, a magnetized coagulation reaction device and a magnetic separation device, wherein the fine grille device comprises a grille pool, and a rotating drum grille and a backwash pump that are arranged in the grille pool; the magnetized coagulation reaction device comprises a mixing reaction tank; the magnetic separation device comprises a magnetic disc separator of magnetic floccules, and a slag discharge device communicated with an outlet of the mixing reaction tank; and a scraping device is arrangedbetween the slag discharge device and the magnetic disc separator. According to the magnetic purification system and the purification method, quick purification of the overflow sewage is achieved through a modular design; an integration degree is high; and the system and the method can be used for emergency treatment, are applicable to temporary treatment and can be recycled.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a magnetic purification system and a purification method for rapidly purifying combined overflow sewage. Background technique [0002] With the acceleration of urbanization in our country, the large-scale expansion of urban areas and the substantial increase of impervious areas such as roads, squares, parking lots, and houses have caused the natural infiltration of rainwater to decrease and the runoff coefficient to increase; most rural areas and Due to the adoption of combined rain-sewage drainage system and the unsound drainage network in some areas in the old urban areas, sewage overflow often occurs in the rainy season; when the combined drainage system is under heavy rain, due to the inflow of a large amount of rainwater, the flow exceeds the sewage collection system When designing capacity, it is directly discharged into the urban water body in the form of overflow, which is...

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Problems solved by technology

[0004] A. Media filtration: The pipeline of the filtration equipment is complicated, and it must be equipped with water inlet pipe, water production pipe, backwash water inlet pipe, backwash discharge pipe and corresponding valves. It is not suitable for overflow sewage with high suspended solids. When the suspended solids are high After the overflow sewage enters the filter, it is easy to block the filter, which greatly shortens the proportion of filtration in the operation cycle and reduces the efficiency of the filter;

[0005] B. MBR membrane filtration technology is a membrane separation technology for solid-liquid separation through polymer hollow membrane materials. It has a good removal effect on water-insoluble substances such as SS in sewage, but it is limited in the process of river restoration. Area, treatment efficiency, investment amount, etc. are greatly affected, and there are disadvantages such as weak impact load resistance, easy clogging of membrane elements, and high investment amount;

[0006] C. Sedimentation tank method (grit chamber method) is to use gravity to aggregate the suspended matter in the water into larger particles by adding a coagulant, settle to the bottom of the water body, and then discharge it through the sand discharge device to purify the water; the sedimentation tank It has a good removal effect on suspended particles in water, but the hydraulic conditions are strictly controlled, so the impact load resistance is small, and when the influent fluctuates greatly, the effluent water quality is difficult to guarantee

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