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A treatment method for simultaneously removing multiple metal ions in manganese-containing wastewater

A treatment method, metal ion technology, applied in the field of water treatment, can solve the problems of shortening hydraulic retention time, increasing process complexity, increasing treatment cost, etc., and achieves the effects of saving chemical dosage, reducing specific surface area, and reducing treatment cost

Active Publication Date: 2019-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, although the manganese dioxide in the sewage itself has a certain coagulation-assisting effect, the effect is relatively limited. In experimental research and practical engineering applications, a certain amount of coagulant needs to be added to promote the coagulation and precipitation of manganese dioxide to achieve The purpose of shortening the hydraulic retention time and reducing the turbidity of the effluent
However, due to the need to add coagulant, the complexity of the process is increased, and the processing cost is also increased

Method used

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  • A treatment method for simultaneously removing multiple metal ions in manganese-containing wastewater
  • A treatment method for simultaneously removing multiple metal ions in manganese-containing wastewater
  • A treatment method for simultaneously removing multiple metal ions in manganese-containing wastewater

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Embodiment 1

[0032] This embodiment selects polluted high-manganese-containing water from a mining area in Guangxi. The calcium ion concentration in the raw water is 324.5mg / L, the magnesium ion concentration is 53.9mg / L, and the pH is 6.89. Other water quality parameters are shown in Table 1. The invented manganese removal process removes manganese, and the treatment temperature is 14°C.

[0033] S1. Add 24.29mg / L potassium permanganate to the raw water and adjust the pH to 8.0 (theoretically, when the molar ratio of potassium permanganate to manganese ions is 2:3, the manganese ions can be completely oxidized into insoluble Manganese dioxide, that is, 1 mg manganese theoretically requires 1.92 mg potassium permanganate. The concentration of manganese ions in raw water is 15.1 mg / L, and theoretically 28.99 mg / L of potassium permanganate is required to completely oxidize divalent manganese ions into di Manganese oxide), while oxidizing for 2min at a stirring speed of 300r / min to carry out ...

Embodiment 2

[0040] The steps described in embodiment 2 are as follows:

[0041] S1. Add 24.29mg / L potassium permanganate to the raw water and adjust the pH to 7.5 (theoretically, when the molar ratio of potassium permanganate to manganese ions is 2:3, the manganese ions can be completely oxidized into insoluble Manganese dioxide, that is, 1 mg manganese theoretically requires 1.92 mg potassium permanganate. The concentration of manganese ions in raw water is 15.1 mg / L, and theoretically 28.99 mg / L of potassium permanganate is required to completely oxidize divalent manganese ions into di Manganese oxide), while oxidizing for 2min at a stirring speed of 300r / min to carry out pre-oxidation;

[0042] S2. After the pre-oxidation is finished, add 35.19mg / L polyaluminum chloride and stir rapidly at 300r / min for 15min;

[0043] S3. Stir at a medium speed of 50r / min for 2min;

[0044] S4. Stir at a slow speed of 20r / min for 5min for flocculation;

[0045] S5. Measure the turbidity of the super...

Embodiment 3

[0047] Repeat Example 2 with the same steps described above, the difference is that 40.39 mg / L of polyferric sulfate is added in the step S2.

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Abstract

The invention discloses a treatment method of simultaneously removing multiple metal ions in manganiferous waste water. The treatment method comprises the following steps: first adding permanganate into the manganiferous waste water, oxidizing the manganese ions in the manganiferous waste water, and converting Mn<2+> into manganese dioxide floc; then adjusting the pH value of the manganiferous waste water to 7.0-10.0; then conducting stirring at a speed of 200r / min-400r / min to let the manganese dioxide floc mutually collide and enlarge, and conducting stirring at a speed of 10r / min-30r / min to fully adsorb the manganese ions and other coexisting metal ions in the manganiferous waste water; and finally allowing the manganiferous waste water to stand for 30min or above to settle the manganese dioxide floc. The treatment method uses the coagulation of the calcium ions and magnesium ions in the waste water on the manganese dioxide to remove the metal ions in the manganiferous waste water, without adding a coagulant.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a treatment method for manganese-containing wastewater. Background technique [0002] In recent years, water pollution incidents caused by heavy metals such as manganese, nickel, cadmium and chromium have occurred frequently, which has attracted great attention from all walks of life. Excessive manganese concentration will cause deterioration of water quality, resulting in "black water" and "yellow water". Long-term intake of excessive manganese by the human body will cause lesions in related organs and cause chronic poisoning. Similarly, the intake of a small amount of nickel, chromium and cadmium can also cause allergic reactions in the human body, which may cause serious lesions and even cancer. Cadmium will accumulate in the human body, and it is difficult to excrete it through metabolism. There are many valence states of manganese in nature, mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/00C02F1/5236C02F1/66C02F9/00C02F2101/20C02F2101/206C02F2101/22
Inventor 刘正乾闫娅慧吴晓晖涂嘉玲崔玉虹邓琳章北平
Owner HUAZHONG UNIV OF SCI & TECH