Nano magnetic powder catalytic oxidation and wastewater treatment system

Abstract

The invention discloses a nano magnetic powder catalytic oxidation and wastewater treatment system, comprising a pre-treatment unit, a primary filter unit, a secondary filtration unit and a photo-catalytic oxidation unit. The upper portion of the pre-treatment unit is provided with a nano magnetic powder feeder and the inner bottom is provided with a stirring device, the upper portion of the primary filter unit is provided with a magnetic drum and a magnetic powder recycling device, this system also comprises an ultrasonic separator, a feed end of the ultrasonic separator is connected with the magnetic powder recycling device through a conveying belt, a discharge end of the ultrasonic separator is connected above the pre-treatment unit through an obliquely arranged guide channel, and the lower portion of the ultrasonic separator is also provided with a dirt outlet. Suspension in wastewater is trapped by using nano magnetic powder, magnetic powder with pollutants adsorbed thereto is collected under the action of the magnetic drum, the pollutants adsorbed to the nano magnetic powder are washed and separated under action of ultrasonic, ultrasonic washing greatly reduces water consumption in the backwash regeneration process, improves wastewater treatment efficiency and saves resources.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a nano-magnetic powder photocatalytic oxidation sewage treatment system. Background technique [0002] At present, the most widely used deep-bed sand filter is the adsorption-based deep-bed sand filter with quartz sand as the filter medium. Its main structure is that there is a supporting layer in the cylindrical tank, and above the supporting layer is a sand filter bed, which has a heterogeneous fixed pore structure. From bottom to top, there are big river pebbles, small river pebbles, big stones, small stones, coarse sand, medium sand, etc., which are the so-called "cushion layers", which belong to the non-effective adsorption layer. The fine sand layer of the main body above is an effective adsorption layer, and there is a considerable reserved space on the upper part of the filter bed. There is a pre-filtered water inlet on the outer top of the ...

AI Technical Summary

Problems solved by technology

[0003] The main problems: First, the filtration accuracy is low and generally does not meet the standard

Second, it is easy to adsorb and difficult to desorb

The structure of the filter bed is complex and belongs to the fixed pore structure, so the adsorption is easy, and the desorption regeneration is very difficult.

The filter bed is easy to cause clogging. After clogging, it is generally necessary to increase the displacement to flush. Since the depth of the filter bed is half a tank and the upper half is an empty tank, although the filter bed has a fixed pore structure, the stability of the entire filter bed is extremely poor, and often It will cause heterogeneous filter bed to fail due to mixed layers, and recovery is very difficult, thus affecting production

Third, it is extremely unsuitable for sewage containing polymers and organic matter

However, in the photocatalytic oxidation link in the prior art, due to the limitation of the container during the flow of sewage, the effective contact area between the water flow and the photocatalyst is limited. capacity and increase the effective contact area between water flow and photocatalyst

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