Iron And Manganese Removal Filter
In addition to iron and manganese filter also known as manganese filter, it is composed of aeration device and manganese sand filter tank; The low iron ion and low manganese ion in water were oxidized into high iron ion and high manganese ion by oxidation method, and then the iron and manganese...
In addition to iron and manganese filter also known as manganese filter, it is composed of aeration device and manganese sand filter tank; The low iron ion and low manganese ion in water were oxidized into high iron ion and high manganese ion by oxidation method, and then the iron and manganese content in water was reduced by absorption filtration.
A. The process flow
Aeration, contact oxidation, adsorption filtration, backwash
2. Filtering operation process of iron and manganese removal
According to the water quality situation, adopt the deep well water residual pressure jet aeration or compressed air aeration and so on, the pipe mix dissolved oxygen, stable and reliable. Aeration method on the one hand is to increase the dissolved oxygen in water; The second is to remove CO2 to increase the PH of the water, oxidizing ferric to ferric precipitation, and then filtering.
(2). Contact oxidation
Natural manganese sand filter material is used as filter material, which has the function of catalysis and filtration.
The main component of natural manganese sand is manganese dioxide (Mno2), which is a good catalyst for the oxidation of Fe2+ into Fe3+. When the PH value of iron-bearing groundwater is > 5.5, Fe3+ can be oxidized into Fe3+ upon contact with natural manganese sand. The reaction is as follows:
A. 4 mno2 mn2o7 o2 + 3 = 2
B.M n2O7 + 6 mno2 fe2 + + 3 h2o = 2 + 6 fe3 + + oh -
Fe3+ is immediately hydrolyzed into flocculent iron hydroxide precipitate: Fe3++3OH-=Fe(OH)3
(3) adsorption filter
A. Removal of flocs (Fe(OH)3 precipitates) formed by Fe3+ through manganese sand filtration layer;
B. Most of the unoxidized Fe2+ catalyzed oxidation and oxidized ion exchange in order to remove iron.
Manganese sand in addition to iron mechanism, in addition to relying on its own catalytic action, there is in the process of filtering manganese sand filter material surface gradually formed a layer of iron filter film as an active filter film, can play a catalytic role. The newly generated iron oxide, as the active filter membrane material, also participates in the new catalytic iron removal process, so the iron removal process of the active filter membrane is an automatic catalytic process.
The removal principle of manganese is the same as that of ferric iron.
The system can adopt manual and automatic control methods. Regular back washing of manganese sand is required to remove impurities such as suspended solids that may trap the flow and loosen the manganese sand and cushion. Since the filter is equipped with backwash device, backwash water pump is not required.
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