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
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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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