Application of Filter Press in Car Wash Wastewater Treatment

Application of Filter Press in Car Wash Wastewater Treatment

With the development of the social economy and the improvement of living standards, the use of cars is increasing. As an indispensable part of urban life, the car wash industry produces a large amount of sewage every day. However, most car wash places do not have wastewater treatment and recycling equipment, and the car wash water is directly discharged into municipal pipes after simple sedimentation, causing certain pollution to the urban water environment.

Car wash wastewater contains a large number of pollutants, such as oil, organic matter, and anionic synthetic detergents. If it is directly discharged without treatment, it will inevitably cause pollution to the water body. It can be seen that the current car washing industry wastes a lot of water resources and seriously pollutes the urban water environment. This article will introduce the application of filter press in car wash wastewater treatment.

Car wash industry

Car Wash Wastewater Quality

Cars are easily polluted while driving. The dirt adhered to the car body and glass is mainly dust, oil smoke from incomplete fuel combustion, and various particles floating in the air. The dirt adhered to the chassis and wheels is mainly sediment, road asphalt, coal tar, and combustion oil. There are also differences in the detergents used and cleaning methods. Due to the different types of vehicles being washed (small vehicles and large transport vehicles), different functions of car washes, and different cleaning methods (mechanical car washing and manual high-pressure water washing), the composition of pollutants in car wash wastewater will be different, but in essence, the quality of car wash wastewater is not much different.

plate and frame filter press
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How the Filter Press Works

The filter press separates the solid particles from the liquid in the mixture by applying a certain amount of pressure, thereby achieving the purpose of solid-liquid separation. Its working principles mainly include the following:

Feeding: Transport the car wash wastewater to the inside of the filter press through pipelines.

Filtration: Inside the filter press, through filter media such as filter cloth or filter plate, solid particles are trapped in the filter cloth or filter plate, while clean water flows out through the filter media.

Pressing: In order to improve the filtration efficiency, the filter press usually applies a certain amount of pressure to squeeze the water out of the solid particles, making the solid particles drier.

filter press

Filter Press Application in Car Wash Wastewater Treatment

Sewage Collection

First, the car wash will collect the sewage generated through the drainage system. This sewage contains water and detergents used in the car wash process, as well as solid particles such as grease and sand, washed off the surface of the car.

Prepare the Filter Press

After the sewage is collected, it needs to be transported to a filter press for treatment. A dedicated treatment area can be set up at the rear of the car wash to install the filter press.

Feeding and Filtration

The sewage is transported to the feed port of the filter press through a pipeline. Once inside the filter press, the sewage is fed into the filter press’s filtration system. Filtration systems typically consist of filter cloths or plates that effectively trap solid particles on the surface while clean water flows out through the filter media.

Solid Waste Disposal

After filter press treatment, solid waste will remain on the surface of the filter media or accumulate at the bottom of the filter press. Regular cleaning of the filter media and disposal of solid waste are key steps to ensure long-term stable operation of the filter press. Solid waste is typically collected and sent to specialized treatment sites for further disposal, such as incineration or landfill.

filter press

Advantages of Using a Filter Press

Recycling or discharge of clean water: The clean water after filter press treatment can be directly recycled and used for car washing or other purposes. If the clean water meets the discharge standards, it can also be discharged directly into the environment to reduce the impact on the natural environment.

Efficient solid-liquid separation: The filter press can quickly and effectively separate solid particles and liquids in car wash sewage, greatly reducing treatment costs and time.

Good grease separation effect: The filter press can effectively intercept grease in sewage through filter media such as filter cloth, improving treatment efficiency and water quality.

Easy to operate: The operation of the filter press is relatively simple and only requires regular cleaning of the filter media and disposal of solid waste.

Environmental protection and energy saving: Using a filter press to treat car wash sewage can effectively reduce the discharge of solid waste reduce energy consumption and environmental pollution.


As an efficient solid-liquid separation equipment, the filter press plays an important role in car wash sewage treatment. Its efficient solid-liquid separation capability, easy operation, and environmental friendliness make it one of the preferred equipment for sewage treatment in the car wash industry. By using a filter press to treat car wash sewage it can not only protect the environment but also provide strong support for the sustainable development of the car wash industry.

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