current position:Home > Water purification equipment > Production and domestic water treatment equipment > Groundwater removal of iron and manganese
Stainless steel groundwater iron and manganese removal equipment
Basic equipment parameters:
Name: Stainless steel groundwater iron and manganese removal equipment
Water inlet diameter 4000 (mm)
Water production 10
Working pressure 6 (psi)
Most of the natural water contains a certain amount of impurities, such as sediment, clay, organic matter, inorganic salts, microorganisms, mechanical impurities, etc. The existence of these impurities seriously affects the water quality of modern residents. The purpose of groundwater treatment is mainly to remove iron and manganese. , Ammonia nitrogen, sediment, scale and other harmful substances, so that the treated water quality meets national drinking water standards.
I. Application of filtering equipment in groundwater treatment
Introduction to groundwater filters Multi-media filters use one or more filter media to pass highly turbid water through a granular or non-granular material of a certain thickness under a certain pressure, effectively removing suspended impurities from the surface to clarify the water Process, commonly used filter materials are quartz sand, anthracite, manganese sand, activated carbon, etc., mainly used to treat water turbidity, color, visible to the naked eye, particulate impurities, etc., also often used as softened water, pure water before Grade pretreatment, etc., the turbidity of the effluent can reach below 3 degrees.
Multi-media filtering equipment uses:
Filter out suspended matter, mechanical impurities, organic matter, mud, etc. in order to reduce water turbidity; adsorb and remove pigments, organic matters, colloids, odor, residual chlorine and some heavy metal ions and microorganisms in water to improve and purify The purpose of water quality.
Second, the groundwater iron and manganese removal process
1. Harm of iron and manganese in groundwater China has abundant groundwater resources, and many of them have excessive iron and manganese, which are called iron and manganese-containing groundwater.
In clear natural groundwater, iron is mainly dissolved ferrous ions. When the groundwater extraction ground comes into contact with the air, the iron-containing groundwater is no longer clear and transparent and becomes a "yellow soup." This is mainly due to the divalent iron ions in the groundwater being oxidized by oxygen in the air to produce orange-yellow iron hydroxide Fe (OH) precipitates.
4Fe 2+ + 02 + 10H20 = 4Fe (OH) 3 + 8H +
Excessive iron and manganese in water will bring great harm to domestic drinking and industrial water. The state stipulates that the content of iron ions in drinking water should be ≤0,3 mg / L, and the content of manganese ions should be ≤0,1 mg / L. Iron and manganese are elements required by the human body, as long as the water content does not exceed the standard, it will not affect human health. However, when the iron content in the water is 1> 0.3 mg / L, the water becomes turbid. When the iron content exceeds 1 mg / L, the water has an iron smell. When boilers, pressure vessels, and other equipment use water with high iron content as the medium, often As a result, the ion exchange equipment in the softening equipment is polluted and poisoned, and the pressure-bearing equipment has formed brown and hard iron scales, causing it to deform and burst. Therefore, it is very important to remove iron and manganese from ferrous water.
2. Introduction to groundwater iron and manganese removal equipment technology The use of manganese sand to reduce the content of iron and manganese ions in water is achieved through two important links. One is groundwater aeration, and the other is iron-manganese water passing through a manganese sand filter. Both processes are indispensable. Aeration means that the groundwater is drawn into the ground and the air is fully contacted, so that oxygen is quickly dissolved in the water, which is also called the oxygenation process. Aeration also includes another purpose, which is to remove carbon dioxide from the water to increase the pH of the water. Increasing the pH of water is determined based on water quality conditions or process needs. The amount of aeration is calculated in the process design. Theoretically, the dissolved oxygen in water oxidizing 1 mg / L of ferric ion to ferric ion should be 0.143 mg / L. Generally, the weight of 1 liter of air at 20'E is 1.205 grams, and the proportion of oxygen in the air is about 1/5. Based on this, it can be inferred that 1 mg / L of divalent iron ion needs to be injected in each cubic meter of water. The air is about 0 and 5 liters. No matter what aeration method and equipment is used. In general, the actual aeration volume in the water must be at least two times larger than the theoretical value to ensure that sufficient oxygen is dissolved.
Manganese sand filter material is mined from natural manganese ore and crushed and sieved. Its main ingredient is manganese dioxide. Some people think that ferrous water flows through the filter layer, and manganese sand only plays a role in filtering precipitates such as Fe (OH) 3. This view is not correct. When ferrous water flows through different grades of manganese sand filter media, the effect of manganese sand on removing iron and manganese ions in water has two aspects:
1. Catalyzes oxidation. Manganese dioxide contained in manganese sand is a good catalyst when the pH of the molten iron is above 6.0.
2. Adsorption, separation and filtration.
Fe (0H) 3 is a colloidal substance, and Mn (0H) 2 is a precipitate. When the water containing iron and manganese flows through the manganese sand filter layer, it is adsorbed in the interstices and filter layers of the manganese sand particles to separate and filter iron and manganese Purpose of insoluble matter. The above two functions are completed simultaneously when water flows through the manganese sand filter layer.