Method for removing manganese in drinking water through oxidation and filtration

A drinking water and pre-oxidation technology, which is applied in chemical instruments and methods, filtration treatment, oxidized water/sewage treatment, etc. , the effect of reducing the consumption of medicine

Inactive Publication Date: 2017-05-31
ANHUI UNIVERSITY OF ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provides a method for manganese removal by oxidation and filtration of drinking water to solve the problem of KMnO in the existing manganese removal process. 4 Large dosage, MnO 2 is re-reduced to soluble Mn 2+ , causing technical problems such as unqualified water discharge

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  • Method for removing manganese in drinking water through oxidation and filtration

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Embodiment 1

[0026] This embodiment provides a method for removing manganese by oxidation filtration to produce drinking water using summer lake water as source water. In summer, the temperature is high and the lake has obvious stratification. The temperature of the lake surface reaches above 25℃, and the temperature of the bottom of the lake is often below 20℃. The source water manganese concentration is as high as 0.6~1.0mg / L, and the maximum exceedance is more than 10 times. However, the concentration of organic matter is not high, and the OC index is generally up to standard (4 Both used to oxidize Mn 2+ , And used to oxidize organic matter, so it needs to maintain KMnO 4 The dosage of O can be appropriately reduced 3 The dosage includes the following steps:

[0027] (1) The source water of the lake whose manganese concentration exceeds the standard in summer is fed into the distribution well through the first-level pumping station, and KMnO is added for the first time at the first-level pu...

Embodiment 2

[0034] This embodiment provides a method for removing manganese by oxidizing and filtering to produce drinking water during the summer rainstorm. The water quality during the summer rainstorm is different from the usual water quality. During the rainstorm, the turbidity increases and the concentration of water colloidal substances and organic matter increases, which is beneficial to manganese removal. Mn 2+ The flocs can be formed by electrically neutralizing the colloid (the colloid has a net negative charge), and it is removed during the precipitation process. This situation can slightly reduce KMnO 4 Dosing amount, increase O 3 Dosing amount. In this example, the dosage of activated carbon is 3mg / L, the dosage of NaClO is 6mg / L, the dosage of coagulant is 50mg / L, the second KMnO 4 The dosage is 0.01mg / L, and the dosage of NaClO disinfectant is 20mg / L. The other steps are the same as in Example 1.

Embodiment 3

[0036] This embodiment provides a method for removing manganese by oxidation and filtration using autumn lake water as source water. The temperature in autumn is suitable, the lake turns over, and the lake does not have stratification. The temperature of the lake water is about 10-20℃, and the concentration of manganese is medium, which exceeds the standard. The general concentration is 0.07-0.20mg / L, and the exceeding is generally within 1 time. However, the concentration of organic matter is higher than that in summer, and the OC index is usually slightly exceeded, the concentration is about 5-8mg / L. In this case, the addition of oxidant needs to take into account both oxidized organic matter and Mn 2+ , In this case, the pre-oxidized O should be increased 3 And NaClO dosage. In this example, the dosage of activated carbon is 4mg / L, the dosage of NaClO is 5mg / L, the dosage of coagulant is 35mg / L, the second KMnO 4 The dosage of NaClO is 0.10mg / L, and the dosage of NaClO disinf...

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Abstract

The invention discloses a method for removing manganese in drinking water through oxidation and filtration, and belongs to the technical field of drinking water treatment. According to the method, different oxidants are added at corresponding structures in a segmented manner by adoption of a sequence of KMnO4-O3-NaClO-KMnO4, so that the manganese removal effect of source water can be ensured, the water supply safety is increased, the agent consumption is decreased, the water production cost is reduced and a certain effect is provided to decrease the disinfection by-products. The cost of NaClO is much lower than that of KMnO4, but the amount of unit mass of an NaClO electronic acceptor is 4.2 times of that of a KMnO4 electronic acceptor, so that the use amount of the KMnO4 can be greatly decreased through importing the NaClO and then the medicament cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of drinking water treatment, in particular to a method for removing manganese by oxidation and filtration of drinking water. Background technique [0002] At present, many cities in my country use reservoirs or lakes as water sources for urban water supply. Due to geological reasons or pollution, there are often large amounts of manganese-containing sludge at the bottom of the reservoirs. With the occurrence of reservoir stratification events in summer, the water body lacks convective movement, and oxygen deficiency at the bottom of the reservoir is inevitable. The manganese originally fixed in the sediment is reduced to soluble Mn under hypoxia. 2+ ,Mn in pore water 2+ Migrate to the overlying lake water, causing the manganese concentration in the water to increase. Although manganese is an essential trace element for the human body, when the manganese content in the water supply exceeds the prescribed concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/001C02F1/283C02F1/5245C02F1/76C02F1/78C02F3/00C02F9/00C02F2101/206C02F2201/78C02F2303/04
Inventor 黄显怀唐玉朝杨妍钱益群李卫华施微乔龙君蔡燕勇杨先然
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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