Multimedia Filter: The Key to Efficient Water Purification

In the relam of water treatment, the multimedia filter stands as a remarkable and essential component, playing a crucial role in ensuring clean and safe water for a wide range of applications. Let's embark on an in-depth exploration of this fascinating filtration system.

Product Introduction

The multimedia filter is a sophisticated water treatment device designed to remove impurities and contaminants from water. It consists of a pressure vessel filled with multiple layers of different filtration media, such as sand, gravel, anthracite, and activated carbon. These media work in harmony to trap particles, sediments, organic matter, and other impurities, providing high-quality filtered water.

The multimedia filter is known for its versatility and effectiveness in handling a variety of water sources, including surface water, groundwater, and industrial wastewater. It can be used in both large-scale municipal water treatment plants and smaller industrial or commercial applications.

Working Principle

When raw water containing pollutants or impurities passes through a filter layer of a certain thickness under a certain pressure, the pollutants or impurities in the water are intercepted or adsorbed by the filter material, thus being purified and becoming relatively clean (or meeting certain requirements) water; and after the pollutants intercepted or adsorbed on the filter medium are continuously removed in a certain period, the entire system can maintain continuous operation. In this way, raw water is continuously fed into the filter, and after being purified, it becomes clean water that continuously flows out of the filter and into the system.

1.The operation process of the filter mainly consists of alternating cycles of filtration and backwashing.

(1) Filtration is the process of producing clean water. When raw water enters the filter through the water inlet pipe and water distribution system, it intercepts or adsorbs suspended matter in the water under a certain pressure through the filter layer, and the clean water is collected by the water collection system and discharged from the outlet. During the filtration process, due to the continuous interception of dirt in the water, the pores of the filter layer will gradually decrease and the water resistance will continue to increase. 

When the discharge conditions are met, the equipment should be backwashed. The backwashing cycle is generally determined according to the outlet water quality or head loss.

(2) The backwashing process is the process of system regeneration. Raw water can be used for backwashing, and raw water pumps are used for raw water backwashing. If the raw water quality is poor, clean water is required for backwashing, and a backwash pump is installed for clean water backwashing. The backwashing pressure is generally not less than 0.3mpa.

2.Working process

(1) Filtration process

The filter tank is made of carbon steel with corrosion resistance inside and outside. Combined with the fluidized design, it ensures that the filter material will not wear out during the filtering and cleaning process. Therefore, while achieving the best filtering effect, the tank body has a long service life and avoids secondary blockage caused by tank body corrosion.

The water distributor allows the unfiltered water flow to flow evenly through the packing layer even at high flow rates and maintain a flat water surface on the packing layer.

The uniquely designed mushroom-shaped pressure difference compensation filter water collector balances the water pressure of each part of the system in the filtering state, with high filtering flow rate and high efficiency; an internal circulation is formed in the backwashing state. During the backwashing process, the water collector forms a vortex to ensure that the dirt is completely backwashed out of the filter tank without sand running away.

(2) Backwash process

As impurities continue to accumulate in the packing layer, the head loss will continue to increase. When the head loss reaches a certain set limit, or after a pre-set period of time, the system will automatically switch to the backwash state to clean the accumulated impurities. For the system, regular backwashing to remove accumulated impurities is necessary.

Application Industries

The multimedia filter uses fillers to reduce the turbidity in the water, intercept and remove suspended matter, organic matter, colloidal particles, microorganisms, chlorine odor and some heavy metal ions in the water. It is an important water treatment equipment in the water purification system. Some of the key application industries include:

• Municipal Water Treatment
  In municipal water treatment plants, multimedia filters are used to remove suspended solids, turbidity, and other impurities from raw water before it is treated further with disinfection processes. They help ensure that the water supplied to households and businesses meets the required quality standards.

Industrial Water Treatment

Industries such as power generation, petrochemicals, pharmaceuticals, and food and beverage rely on multimedia filters to treat process water and wastewater. They remove contaminants that can affect the performance and quality of industrial processes, as well as protect equipment from damage.

• Swimming Pools and Aquatic Facilities
  Multimedia filters are commonly used in swimming pools and aquatic facilities to keep the water clean and clear. They remove dirt, debris, and bacteria, providing a safe and enjoyable swimming environment.

• Irrigation and Agricultural Applications
  In irrigation systems, multimedia filters are used to remove sediments and contaminants from water sources to prevent clogging of irrigation nozzles and ensure proper water distribution to crops.

Technical Parameters

1.Treatment Effect

Inlet turbidity: <20FTU,

outlet turbidity: <3FTU;

2. Working environment parameters

(1) Working temperature: 5-60℃;

(2) Working pressure: ≤0.6MPa;

(3) Inlet water pressure: ≥0.1MPa;

(4) Backwash inlet water pressure: ≥0.3MPa;

(5) Inlet and outlet pressure difference: 0.02-0.05MPa.

3. Operation parameters

(1) Working mode: pressure type;

(2) Operation mode: water flow from top to bottom;

(3) Filtration speed: 10-15m/h;

(4) Backwashing method: water washing, or air-water combined backwashing;

(5) Backwashing water consumption: ≤3%;

(6) Backwashing intensity: 4-15L/s·m2;

(7) Backwashing duration: 10-15min;

(8) Backwashing expansion rate: 40-50.

4. Control mode: manual control, automatic control (time control);

5. Tank material: Q235B, 304, 316L, carbon steel lining.

 Water cap material: ABS, 304, 316L;

6. Single unit flow: 0.5m3/h~180m3/h;

7. Input voltage: AC22OV± 10﹪ 50-60HZ;

8. Output voltage: AC24V/ AC220V;

Customization and Adaptability

One of the significant advantages of multimedia filters is their customization and adaptability to different applications. The following factors can be customized to meet specific requirements:

1. Filter Media Selection

Based on the water quality analysis and the contaminants to be removed, different combinations of filtration media can be selected. For example, if the water contains high levels of iron and manganese, manganese sand filter media with high adsorption capacity for these metals can be used.

2. Filter Bed Configuration

The filter bed can be designed in different configurations, such as single-layer, multi-layer, or graded media beds. The configuration can be optimized to achieve the best filtration performance and minimize pressure drop.

3. Filter Size and Capacity

Multimedia filters can be manufactured in different sizes and capacities to meet the specific flow rate requirements of different applications. Smaller filters are suitable for residential or small commercial applications, while larger filters are used in industrial and municipal water treatment plants.

4. Automation and Control

Modern multimedia filters can be equipped with automated control systems that monitor the filter performance and initiate backwashing when necessary. This ensures consistent filtration efficiency and reduces the need for manual intervention.

Example of product application

Effect of a factory sewage pool after multimedia filtration

Comparison of river water before and after filtration

Comprehensive Guide

To ensure the optimal performance and longevity of a multimedia filter, the following comprehensive guide can be followed:

1. Installation

Proper installation is crucial for the effective operation of the filter. The filter should be installed in accordance with the manufacturer's instructions and local plumbing codes. It should be located in a convenient location for maintenance and access.

2. Startup and Commissioning

Before putting the filter into operation, it is necessary to perform startup and commissioning procedures. This includes flushing the filter with clean water to remove any debris or loose media, adjusting the flow rate and pressure settings, and checking for leaks.

3. Operation and Monitoring

During operation, the filter should be monitored regularly for pressure drop, flow rate, and filtration efficiency. Any significant changes in these parameters may indicate a problem with the filter and require immediate attention.

4. Backwashing

As mentioned earlier, periodic backwashing is essential to maintain the filtration efficiency of the multimedia filter. The backwash frequency and duration should be based on the water quality, flow rate, and filter bed depth. During backwashing, the filter should be isolated from the main water supply to prevent backwash water from entering the treated water system.

 5. Maintenance and Cleaning

Regular maintenance and cleaning of the filter are necessary to ensure its long-term performance. This includes inspecting the filter media for signs of wear or damage, replacing the media as needed, and cleaning the filter vessel and components.

6. Troubleshooting

In case of problems with the filter, such as high pressure drop, low flow rate, or poor filtration efficiency, troubleshooting steps should be taken to identify and resolve the issue. This may involve checking for clogged media, leaks, or malfunctioning components.

In conclusion, the multimedia filter is a powerful and versatile water treatment device that plays a vital role in ensuring clean and safe water for various applications. With its effective filtration capabilities, customization options, and reliable performance, it is an essential investment for any water treatment system. By understanding its working principle, application industries, technical parameters, and maintenance requirements, users can make informed decisions and maximize the benefits of this remarkable filtration technology.

Remember, when it comes to water treatment, the multimedia filter is your trusted companion on the journey to clean and pure water. So, let's embrace the power of multimedia filtration and enjoy the benefits of high-quality water.

FAQ

Q: How does a multi-media filter work?

A: The multimedia filter operates on the principle of depth filtration. As water passes through the different layers of filtration media, larger particles are trapped in the upper layers, while smaller particles are gradually filtered out as the water moves deeper. The combination of different media with varying pore sizes ensures effective removal of a wide range of contaminants.

Q: How does the customization process work?

A: First, an assessment of the water quality and application needs is conducted. Then, a filtration solution is designed that takes into account the specific contaminants to be removed, flow rate requirements, and available space. The filter is then manufactured and installed according to the customized specifications.

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