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Device and method for recycling car washing wastewater based on active carbon catalytic ozone technology

A technology of car wash wastewater and ozone technology, which is applied in the direction of chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of poor treatment effect, impact on the surrounding environment, high treatment cost, etc., and achieve stable results , Improve removal efficiency, environmental friendly effect

Inactive Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, car wash wastewater mainly adopts physicochemical or biochemical treatment methods, among which the treatment methods with physicochemical as the core are mainly divided into the following categories: 1) coagulation-air flotation-sand filtration, the coagulation air flotation unit in this method has a great impact on washing Agents have a certain removal effect, but the treatment effect is poor, and the structure of the air flotation process is complex, and chemical agents such as coagulant, coagulant, acid and alkali need to be added, the treatment cost is high, and a large amount of chemical pollution needs to be treated. mud, causing secondary pollution; 2) coagulation-sedimentation-sand filtration, the coagulation-sedimentation unit in this method also has a certain removal effect on detergent substances, but the efficiency of coagulation-sedimentation is lower than that of coagulation-air flotation, To achieve the same treatment effect, it is necessary to increase the dosage of chemical agents, which increases the treatment cost of chemical sludge and causes secondary pollution; 3) Activated carbon adsorption. Detergent, etc. can be effectively adsorbed, but in this method, activated carbon is easily saturated, and the replacement cost is high, which is not conducive to the long-term operation of the facility; 4) Photocatalytic oxidation, using titanium dioxide as a photocatalyst to treat synthetic washing, etc., this method needs to use Ultraviolet light source is easily affected by transmittance, and there are still problems such as titanium dioxide powder is difficult to recycle, and the film is easy to fall off.
Biochemical treatment methods are mainly activated sludge method, biofilm method and membrane bioreactor technology, but due to the long molecular chain of surfactant, it is difficult to meet the recycling standard by biochemical method alone
In addition, the biochemical method uses aeration to provide the oxygen required for microbial growth. The presence of surfactants causes a large amount of foam in the reaction tank, which affects the surrounding environment.

Method used

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  • Device and method for recycling car washing wastewater based on active carbon catalytic ozone technology

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A car wash wastewater recycling device based on activated carbon catalytic ozone technology, comprising a car wash wastewater collection pipe 1, a grease trap 2, a sedimentation tank 3, an intermediate pool 4, a blow-off selection area 5, a biochemical aeration area 6, a lifting pool 7, Front sand filter tank 8, catalytic reactor 9, ozone generator 10, reuse water tank 11 and rear sand filter tank 12;

[0040] The car wash wastewater collection pipe 1 is connected to the grease trap 2; a partition plate 21 is fixed on the top wall of the grease trap 2, and the partition plate 21 only has an opening at the bottom; because the density of the oil in the car wash wastewater is lighter than water, the waste water Part of it enters the right part through the opening below the partition 21 and then transports it to the sedimentation tank 3;

[0041] The sedimentation tank 3 is connected to the middle tank 4 through the upper opening 31;

[0042] The intermediate pool 4 is con...

Embodiment 2

[0060] Repeat Example 1, its difference is: in catalytic reactor, fill and support nanometer metal oxide activated carbon particle, the average size of activated carbon particle diameter is 3.0mm, and filling height is 2.0m, and ozone dosage is 5.0mg / L, the residence time is 30min, the pressure in the control reactor is 0.04MPa, the gas-water ratio in the stripping selection zone is 10:1, the gas-water ratio in the biochemical aeration zone is 5:1, and the COD concentration in the influent is 180mg / L, SS is 220mg / L, anionic synthetic detergent 3.2mg / L car washing wastewater treatment, the indicators of recycled water are as follows: COD is 35.4mg / L, SS is 3.1mg / L, anionic synthetic detergent The dose is 0.3mg / L, reaching the water quality standard for car wash recycling water.

Embodiment 3

[0062] Repeat Example 1, its difference is: in catalytic reactor, fill activated carbon particle, the average size of activated carbon particle diameter is 5.0mm, and filling height is 3.0m, and ozone dosage is 10.0mg / L, residence time 60min, the pressure inside the reactor is controlled to 0.08MPa, the gas-water ratio in the stripping selection zone is 20:1, the gas-water ratio in the biochemical aeration zone is 10:1, and the influent COD concentration is 180mg / L, SS After the treatment of the car wash wastewater with a concentration of 220mg / L and an anionic synthetic detergent of 3.2mg / L, the indicators of recycled water are as follows: COD is 32.5mg / L, SS is 3.4mg / L, and anionic synthetic detergent is 0.2mg / L L, reaching the water quality standard for car wash recycling water.

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Abstract

The invention discloses a device for recycling car washing wastewater based on an active carbon catalytic ozone technology. The device comprises a car washing wastewater collecting pipe, an oil isolation pond, a settling pond, a middle pond, a blow-off selecting region, a biochemical aeration region, a lifting pond, a front sand filtration tank, a catalytic reactor, an ozone generator, a recycling water tank and a back sand filtration tank, wherein the car washing wastewater collecting pipe is connected with the oil isolation pond; the oil isolation pond is connected with the settling pond; the settling pond is connected with the middle pond; the middle pond is connected with the front sand filtration tank; the front sand filtration tank is connected with the upper part of the catalytic reactor, and the catalytic reactor is connected with the blow-off selecting region; the blow-off selecting region is connected with the biochemical aeration region; the biochemical aeration region is connected with the upper end of the lifting pond; the lifting pond is connected with the back sand filtration tank; and the back sand filtration tank is connected with the recycling water tank through a pipeline. According to the invention, the active carbon catalytic ozone technology and a biochemical technology are combined, so that the removal efficiency of detergent substances is improved, the effect is stable, the car washing wastewater is recycled, and the device is environmental-friendly.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a recycling device and method for car wash wastewater based on activated carbon catalytic ozone technology. Background technique [0002] As of June 2011, the number of motor vehicles in my country was 217 million, and the number of cars was 98.46 million, including 72.06 million private cars. According to statistics, the water consumption of cleaning a small car is about 50-150L. If a private car is cleaned every half month, and the water consumption is 100L each time, the annual water consumption is about 173 million cubic meters. The large water consumption can be seen. Therefore, increasing the treatment and recycling of car wash wastewater is conducive to alleviating the shortage of water resources and has significant environmental and economic benefits. [0003] The main pollutants in car wash wastewater are particulate matter such as sediment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/78
Inventor 马传军牟桂芹郭亚逢周志国丁禄斌隋立华
Owner CHINA PETROLEUM & CHEM CORP