Apparatus and method for reclaiming waste water from a road cleaning and sweeping vehicle

Abstract

The invention discloses a reclaimed sewage recycling device and method for a road cleaning sweeper. The reclaimed sewage recycling device comprises a filter, a sewage tank, a sewage pump, a clear water tank and an air compressor, wherein the filter adopts a sintered micro-filtration membrane tube as a filtering medium. The reclaimed sewage recycling method mainly comprises the steps of primary filtering, stable filtering, filtering ending and back purging, thorough cleaning after sweeping, and the like. The adopted filtering medium is the tube-type macromolecular sintered micro-filtration membrane which has the characteristics of high tensile strength, low density, high porosity and uniformity, so that high-concentration sewage can be treated without pre-filtration. Besides, the filtering medium is high in adaptability.

Description

technical field [0001] The invention relates to the technical field of sewage purification treatment, in particular to a device and method for recycling sewage recycled by a road cleaning and sweeping vehicle. Background technique [0002] Road cleaning road sweeper is a kind of road cleaning machine that uses high-pressure plunger water pump to generate high-pressure water to clean the ground through high-pressure nozzles, and then recycles sewage. It has high cleaning efficiency and good cleaning effect. It has been welcomed by sanitation users in various cities since it was introduced to the market, and the annual sales volume is increasing at a rate of more than 30%. [0003] However, the high operating cost of road cleaning and sweeping vehicles, especially the short operation time of adding water once, the large water consumption, and the large amount of sewage recovery seriously affect the further promotion and use of road cleaning and sweeping vehicles. Cleaning ope...

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Problems solved by technology

[0005] The Chinese patent with the authorized announcement number CN201704664 discloses a "sewage recycling type road sweeper", which uses centrifugal separation to achieve solid-liquid separation of recovered sewage, but the filtration accuracy of centrifugal separation is difficult to reach below 10 microns, although basically It can meet the water inlet accuracy requirements of the high-pressure plunger pump for cleaning road sweepers, but due to the high turbidity of the effluent water after centrifugal separation, it will cause secondary pollution when the turbid water is sprayed on the ground, making the cleaning effect extremely unsatisfactory

[0006] The Chinese patent application publication number CN102311159A discloses "filter assembly, filter device and vehicle", which uses ultrafiltration membranes with a filtration accuracy of 0.01-0.03 microns to filter and recover sewage. Although the water quality is clear, there are the following fatal limitations: 1) The natural dehydration and drying of the ultrafiltration membrane will lead to the collapse of the membrane pores, which will seriously affect the permeability and mechanical strength of the membrane. Maintenance workload in working condition; 2) Due to the short settling time of recovered sewage, the sewage concentration is high and the turbidity is high. The air volume is large, and the working load of the air pump is large; 3) The ultrafiltration membrane has high requirements on the influent water, and the particle size of the sewage particles should be less than 50 microns, so a pre-filtration is required before the ultrafiltration; 4) When the sewage concentration is too high, the water output sharply reduced, thus seriously affecting the working time of road cleaning and sweeping vehicles

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