Car wash sewage treatment device

Abstract

The invention discloses a car washing sewage treatment device, comprising: a return water pump, a three-phase separator, a high-pressure air supply machine, an oxygen source generator, and a comprehensive purifier. The comprehensive purifier includes an outer cylinder and an inner cylinder concentrically arranged with the outer cylinder; The output end of the return water pump is connected to the input end of the three-phase separator through the first water inlet pipe, and the second output end of the three-phase separator is connected to the input end of the outer cylinder through the regulating pool through the first outlet pipe. The end is also connected with the first emptying pipe, the backwash pipe of the inner cylinder is connected with the first water outlet pipe, and the top of the comprehensive purifier is connected with the first water inlet pipe through the backwash drain pipe. The invention has optimized process flow and strong applicability; system integration and compact structure; high water purification efficiency and stable effect; low investment cost and low operation consumption; simple operation and unattended operation.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a car washing sewage treatment device. Background technique [0002] With the rapid development of my country's social progress and urbanization, people's material living standards continue to improve, and cars have become an indispensable means of transportation in people's lives. According to relevant statistics, the number of cars in the country reached 360 million in 2018, and It is still increasing rapidly at an annual growth rate of 15%, so the demand for car washing across the country has become a huge service industry. [0003] At present, the car washing industry basically uses tap water to wash cars. Due to the irregular management of the industry, car washing sewage is discharged to the surface and sewers at will, which not only seriously wastes water resources, but also contains a large amount of sediment, suspended solids, oil, dissolved organic matter, Surf...

AI Technical Summary

Problems solved by technology

[0012] Its disadvantages are: multi-stage sedimentation and oil separation occupy a large area; coagulation and disinfection agents need to be injected regularly; dissolved organic matter and surfactants cannot be removed, and the problems of blackened water, peculiar smell and foam generation cannot be solved; If the oil is not thorough, it is easy to cause the filter material to be clogged and even scrapped

[0015] The disadvantages are: the water treatment system has too many process links, the system is complicated, the floor area is large, and the investment and operation costs are high; Loss of purification effect; commonly used ultrafiltration membranes cannot remove dissolved organic matter and surfactants, but nanofiltration membranes and reverse osmosis membranes are required for purification. At this time, the investment, operation and maintenance costs are too high

[0018] Its disadvantages are: multi-stage precipitation, oil separation and membrane bioreactor occupy a large area; membrane bioreactor must maintain continuous operation to maintain the stable activity of microorganisms, and the normal purification effect of microorganisms is also affected by many external factors such as pollutant concentration and temperature. Restricted by factors, it is difficult to guarantee the stability of the water purification effect, and its effect on removing the chroma of the water body is poor; after the membrane filter module is clogged, it needs to be taken out regularly for cleaning and regeneration, and the operation is cumbersome

[0021] Its disadvantages are: multi-stage sedimentation and air flotation tanks occupy a large area; coagulation and disinfection agents need to be put in regularly; the removal rate of dissolved organic matter is low, and the water body will still have peculiar smell after long-term recycling

[0024] Its disadvantages are: multi-stage precipitation and air flotation separation area occupy a large area; electrolysis / electrocoagulation reactor has high investment, high energy consumption (about 3 degrees per ton of water and electricity consumption), slow reaction rate, and the electrode is easily passivated, so Its purification stability is poor, the practical application efficiency is low, and the service life is short

[0027] Its disadvantages are: the coagulation agent needs to be put in regularly during the initial precipitation; the fine filter device is easy to block, and needs frequent backwashing and regular replacement; The water quality requirements are high. If the turbidity is high, it is not conducive to light penetration, which directly affects the photocatalytic effect. Again, the quantum efficiency of this technology is low, and the electron-hole pairs generated are easy to recombine and deactivate, so the practical application effect lower

[0029] 1. The system is redundant and has poor applicability

[0030] At present, the car wash water treatment technology is generally a simple series or superposition combination of water treatment technology for different pollutants in a logical order, resulting in doubled costs

[0031] Existing technologies require several stages of pre-precipitation and oil separation. This alone requires a large footprint, on-site supporting engineering, and later manpower cleaning workload, and for equipment using air flotation and membrane bioreactors Due to the requirement to meet the longer hydraulic retention time, its space size will be relatively large, so the practical application compatibility is poor

[0032] 2. Inefficient water purification, poor stability, high investment and operating costs

[0033] For sand filtration, carbon filtration, fine filtration and membrane filtration, the removal efficiency of dissolved pollutants is low, and the problems of black water, odor and foaming cannot be solved, and there are problems of filter material clogging, cleaning and replacement. Therefore, the water purification effect and stability are poor

[0034] For processes such as electrolysis, electroflocculation and photocatalytic oxidation, there are problems of high investment and operating costs, high requirements for raw water quality, poor purification stability, and low practical application efficiency.

[0035] 3. The operation is cumbersome and requires special personnel to be on duty

[0036] Due to the lengthy combination of multiple water treatment processes in the existing technology, the operation status control of each link of equipment is more professional and cumbersome, and most of the systems need to be regularly injected with coagulation and disinfection agents, and filter materials and other consumables also need to be cleaned regularly and replacement, so special personnel are required to be on duty to ensure that the water quality is stable and up to standard, but at this time the application requirements for fully automated operation cannot be truly realized, which will greatly increase the later operating costs

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