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How Sponge Iron Works in Water Treatment Projects
Author:Biyuan Activated carbon Update time:2018-03-28

First, the working principle of sponge iron in water treatment project

Normal-temperature filtration type deoxygenation is chemical deoxygenation. Specially produced active sponge iron (direct reduced iron) is used to remove dissolved oxygen from the water. The main component of sponge iron is iron. Its porous internal structure provides the specific surface area of ordinary iron. With 5-10 million times of crumb, it can make the oxygen and iron in the water oxidize quickly and completely, and make the dissolved oxygen stable below 0.05mg/L. Its reaction formula is: 2Fe2+ + 2H2O + O2 → 2Fe(OH)2 4Fe (OH)2+ 2H2O + O2→4Fe(OH)3 Reaction products Fe(OH)2, Fe(OH)3 are flocculent precipitates that are not easily soluble in water and are intercepted as the water passes through the rest of the sponge iron particles. It can be washed down with a certain amount of backwash water (about 5 minutes). Sponge iron consumption is very low, depending on the amount of water treatment and water quality, usually 3-6 months to add once. (After deoxygenation, a small amount of iron ions are added, usually 0.2-0.5mg/L. For hot water boilers, it still meets the national water quality standards, but there are strict requirements for the steam boiler or water supply Fe2+.

Sponge iron filter material

Sponge iron filter material

In addition to oxygen, iron removal equipment can be added to remove Fe2+ from the water. The center has a variety of ion exchange iron removal devices for users to choose.) As a water oxygen scavenger sponge iron is the use of particle size in -200 mesh The following Fe3O4 powders are bonded together and have a particle size of about 2-5mm. Because of the reduction reaction, a certain number of voids are formed, and there are voids when the powder particles are bonded. This makes the oxygen scavenger extremely porous and has a large specific surface area. Because it is a direct reduction of the original ore, it is relatively pure, so The activity is extremely high, and the oxygen reacts with oxygen in the water to generate Fe3O4, thereby achieving the goal of oxygen removal. At the same time, the utilization rate has also been increased to more than 90%.

Moreover, due to the presence of a certain amount of impurities, the particles can only be connected by weak bonds during the oxygen removal process, and the basic stainless dies into a group. Non-softened water tends to passivate the surface of the oxygen scavenger, causing it to oxidize slowly, which affects the effect of oxygen removal, so it should be softened and then deoxygenated. After a period of use, backwash should be performed. The

Second, the main technical features of sponge iron in water treatment projects:

1. Run at room temperature, without heating, overcomes the disadvantages of heat, vacuum deaeration and heating energy; it can achieve deoxygenation at room temperature without heating in the influent;

2. It occupies a small area, occupies a small space, and is easy to install. It overcomes the inconvenience of installation of heat and vacuum and high oxygen removal. Working principle: The sponge iron oxygen scavenger is a highly active filler after activation treatment. It is sponge-like porous iron particles. For the dissolved oxygen in the water to provide the reaction conditions with the active iron, when the oxygen-containing water passes through the sponge iron, the oxygen and iron in the water undergo a complete oxidation reaction, thereby eliminating the water dissolved oxygen content. The system can supply water at any time, but it does not need preparation time, nor does it need to remove the oxygen tank;

3. When it is accumulated to a certain degree, the soft floc that is insoluble in water can be drained by back flushing to restore the sponge iron to the initial oxygen removal capability. The oxygen removal effect is stable and reliable, and the dissolved oxygen content in the outlet water is stable at ≤0.05 mg/L, which i

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