Difference between activated carbon filter and activated sand filter (activated carbon filter working principle)

Activated Carbon FilterIt is a filter that uses activated carbon as filter media.Activated sand filterIt is a filter that uses quartz sand as filter media, and there is a difference between the two in terms of filter media. The following is a detailed descriptionActivated Carbon Filterrespond in singingActivated sand filterThe function and principle of the program allows you to make a better distinction between them.

Bag filter, precision filter, glass fiber reinforced plastic tank, carbon steel filter, mechanical filter, multi-media filter, ultraviolet sterilizer, quartz sand, activated carbon, resin and other filter media

Activated Carbon Filter

Activated carbon filter is a pressure vessel filled with coarse quartz sand bedding and high quality activated carbon.

Function of activated carbon filter:

In the water quality pretreatment system, the activated carbon filter can adsorb the residual chlorine that can not be removed in the previous filtration to prevent the oxidative degradation of the reverse osmosis membrane in the latter stage, and at the same time, it also adsorbs the contaminating substances such as small molecule organics that leaked from the previous stage, and it has a more obvious adsorption and removal of odors, colloids and pigments in the water, heavy metal ions and so on, and it has a function of reducing COD. It can further reduce the SDI value of RO feed water to ensure that SDI<5, TOC<2.Oppm.

The equipment can remove foreign color, odor and heavy metal substances such as mercury, lead, cadmium, zinc, iron, manganese, chromium and so on in the clear water, and also remove arsenic, hydride, sulfide, residual chlorine and other polymer compounds and radioactive substances such as strontium, radium and other radioactive substances in the clear water, and remove and kill bacteria and Escherichia coli in the water as well as other carcinogenic substances. The structure of activated carbon filter is simple, easy to operate and maintain.

The work of the activated carbon filter is done through the carbon bed. The activated carbon particles that make up the carbon bed have a very large number of micropores and a huge specific surface area, which have a strong physical adsorption capacity. When water passes through the carbon bed, the organic pollutants in the water are effectively adsorbed by the activated carbon. In addition, there are some oxygen-containing tubular energy groups on the non-crystallized part of the surface of activated carbon, so that the organic pollutants in the water through the carbon bed are effectively adsorbed by the activated carbon. Activated carbon filter is a more commonly used water treatment equipment, as a pre-treatment of water treatment desalination system can effectively ensure that the service life of the latter equipment, improve the quality of water, prevent pollution, especially to prevent the latter reverse osmosis membranes, ion exchange resins, etc., the free state of residual oxygen poisoning pollution.

The main factors affecting the adsorption effect and service life of the activated carbon filter are: the type and concentration of pollutants, the retention time of the airflow in the filter material, and the temperature and humidity of the air. The actual selection, according to the type of pollutants, concentration and processing air volume and other conditions, to determine the filter form and activated carbon type.

Activated carbon filter upstream and downstream should have a good dust filter, its efficiency specification should not be less than F7. upstream filter to prevent dust clogging activated carbon material; downstream filter to stop the activated carbon itself dust.

Activated carbon filter working principle:

The adsorption principle of activated carbon is that a layer of balanced surface concentration is formed on the surface of its particles, and then the impurities of organic substances are adsorbed into the activated carbon particles, and the adsorption effect is very high at the initial stage of use. However, over time, the adsorption capacity of activated carbon will be weakened to varying degrees, and the adsorption effect will also decline. If the water quality in the aquarium is turbid and the organic matter content in the water is high, the activated carbon will soon lose its filtering function. Therefore, activated carbon should be cleaned or replaced regularly.

The size of the activated carbon particles also has an effect on the adsorption capacity. Generally speaking, the smaller the activated carbon particles, the larger the filtration area. Therefore, the total area of powdered activated carbon is the largest, the adsorption effect, but powdered activated carbon is easy to flow into the aquarium with the water, it is difficult to control, and rarely used. Granular activated carbon due to particle molding is not easy to flow, organic matter in the water and other impurities in the activated carbon filter layer is not easy to block, its adsorption capacity is strong, easy to carry and replace.

The adsorption capacity of activated carbon is directly proportional to the time of contact with water, the longer the contact time, the better the quality of filtered water.

Note: Filtered water should flow slowly out of the filter layer. New activated carbon should be washed and cleaned before the first use, otherwise ink-black water flows out. Activated carbon in the filter before loading, should be in the bottom and the top of the sponge with a thickness of 2 to 3 centimeters, the role is to prevent algae and other large particles of impurities to penetrate into the activated carbon after 2 to 3 months, if the filtering effect declines should be replaced with new activated carbon, sponge layer should be replaced periodically.

Activated Carbon Filter Pressure Vessel is a pressure vessel filled with coarse quartz sand bedding and high quality activated carbon.

Activated sand filter

Activated sand filter is a kind of continuous filtration equipment integrating coagulation, clarification and filtration based on the principle of countercurrent. Incoming water enters the treatment system through the water distribution pipe at the bottom of the equipment, and overflows from the top outlet after being filtered by the sand bed. The impurities retained by the sand bed during filtration are transported to the sand washer at the top of the filter tank by air power, and the pollutants are separated from the surface of the filter sand by mechanical friction and turbulence, and the impurities are discharged with the sand washing water, and the clean sand is returned to the sand bed by its own weight.

Characteristics of activated sand filters:

1, high efficiency: 24 hours continuous work, no need to stop backwashing.

2, low operating costs: no need for high head and large flow rate backwash pump.

3、Low maintenance cost: There are no rotating parts in the process of operation except quartz sand filter media, low failure rate and low maintenance cost.

4, low one-time investment: no single coagulation tank, clarifier and other facilities, no backwash pumps and electric, pneumatic valves and other equipment, small amount of work, one-time investment.

5、Small head loss: single filter material and filter material clean and timely, small head loss, total head loss ≤ 0.5m.

6, feed water quality requirements are relaxed: can withstand long-term 150mg / L concentration of SS feed water quality, short-term to withstand the impact of 300mg / L concentration of SS and the water quality remains unchanged.

7. Stable water quality and good filtration effect. Filter media clean and timely, can ensure high quality, stable water effect, no periodic water quality fluctuation phenomenon.

8, easy to expand: the unit operation mode can be used to flexibly increase or delete the number of filters according to changes in the amount of water, easy to expand.

9, small footprint, beautiful appearance: its traditional three-stage reclaimed water treatment process as a whole, saving land about 70-80%; more beautiful and compact appearance.