Emergency pretreatment system of source water with excessive iron and manganese and treatment method thereof

A water source water and pretreatment technology, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Manganese sand filter material clogging and other problems, to achieve the effect of saving coagulation reaction pool, reducing equipment investment and reducing floor space

Active Publication Date: 2011-06-29
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for removing iron and manganese ions in water mainly include membrane filtration, chemical precipitation, electrochemical method and natural mineral adsorbent adsorption method. These methods have the following problems in the application process: 1) Membrane filtration is harmful to organic and inorganic Pollutants have a good removal effect, but the problem of membrane pollution has not been effectively solved so far, and the operating cost of membrane filtration is high, which is not suitable for large-scale promotion and application of large water plants; Ions have a good removal effect, but they are not suitable for the removal of low-concentration heavy metal ions; 3) The electrochemical method has the disadvantages of complicated operation and high energy consumption; 4) Although some water plants use manganese sand and other mineral adsorbents to filter , Adsorption and removal of iron and manganese ions in water, but in the process of research and practical application, it is found that the manganese sand filtration method has the disadvantages of low adsorption capacity, slow adsorption rate and difficult regeneration of iron and manganese ions, especially in the treatment of seasonal In the process of polluting source water, the manganese sand filter material is easily blocked by organic matter and some suspended solids in the water, which greatly affects the filtration performance

Method used

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  • Emergency pretreatment system of source water with excessive iron and manganese and treatment method thereof
  • Emergency pretreatment system of source water with excessive iron and manganese and treatment method thereof
  • Emergency pretreatment system of source water with excessive iron and manganese and treatment method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The emergency pretreatment system for source water with iron and manganese exceeding the standard, including source water inlet pipe 1, outlet pipe 9, inclined pipe sedimentation tank 3 and mixed reaction area 4, the inclined pipe is made of polypropylene and forms an angle of 45 degrees with the bottom; It also includes a calcium hydroxide solution preparation tank 2 connected to the water inlet pipe 9, the mixing reaction zone 4 communicates with the solid-liquid separation zone 5, and the solid-liquid separation zone 5 is connected with the resin regeneration tank 8 and the water outlet pipe 9. The solid-liquid separation zone 5 communicates with the resin regeneration tank 8 through a magnetic conveyor belt 6, and the mixed reaction zone 4 has a magnetic cation exchange resin, a magnetic polyacrylic acid series cation exchange resin MD213. The magnetic conveyor belt is a magnetic crawler conveyor with a rubber scraper 7 on the top. The reactor is a compound reactor ...

Embodiment 2

[0031] The basic structure of the system and the basic steps of the processing technology are the same as in Embodiment 1, specifically:

[0032] 1.1 According to the ratio of 1:5000 (volume ratio), add saturated calcium hydroxide solution from the front end of the water intake pipe to the source water (flow rate 0.1m / s), mix and react in the water pipe and then enter the inclined tube sedimentation tank;

[0033] 1.2 The effluent enters the mixed reaction zone of the compound reactor. There is 50ml of magnetic cation exchange resin MD213 in the reaction zone, and the stirring rate of the built-in stirrer is 120r / min; the intermittent effluent has an iron ion concentration of 0.24mg / L and a manganese ion concentration of 0.07mg / L;

[0034] 1.3 The magnetic track transports the magnetic resin to the regeneration zone at a rate of 1cm / s, regenerates the magnetic cation exchange resin with 3% HCl solution, stirs at 120r / min for 20min, and after standing for 10min, settles at the ...

Embodiment 3

[0037] Other operating conditions remain unchanged, but the dosage of calcium hydroxide solution in step 1.1 is adjusted to 1:6000, except that iron ions rise to 0.32 mg / L and manganese ions rise to 0.064 mg / L, other results are the same as in Example 1 same.

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Abstract

The invention discloses an emergency pretreatment system of the source water with excessive iron and manganese and a treatment method thereof, belonging to the source water treatment field. In the system of the invention, a water inlet pipe is connected with a calcium hydroxide solution preparation tank; a mixing and reacting region is communicated with a solid-liquid separation region; and the solid-liquid separation region is connected with a resin regeneration tank and a water outlet pipe. The treatment method comprises the following steps: calcium hydroxide solution is added in the water inlet pipe to perform coagulation reaction, the coagulation effluent is precipitated and treated in an inclined tube sedimentation tank, the effluent enters a complex reactor integrating ion exchange,solid-liquid separation and regeneration to remove residual manganese ions and calcium ions, a magnetic conveyor belt is used to separate magnetic cation exchange resin in the effluent from water, the conventional treatment of the effluent is performed, and magnetic cation exchange resin is regenerated in the regeneration tank by using diluted hydrochloric acid and sent back to the mixing and reacting region. The system of the invention is convenient to operate and the concentrations of iron and manganese in water can fast meet the water quality standard of the drinking source water. The system is stable to run and can fully utilize the original water purification equipment of the water plant.

Description

technical field [0001] The invention relates to emergency pretreatment equipment and methods for water source water, more specifically an emergency pretreatment system and treatment method for source water with iron and manganese exceeding standards. Background technique [0002] Excessive iron and manganese ions in the water will not only lead to changes in the color of the water body, but also increase the hardness. Drinking source water with excessive iron and manganese ions will cause diarrhea and digestive tract diseases. The concentration of iron ions in the source water should be lower than 0.5mg / L, and the concentration of manganese ions should be lower than 0.1mg / L. The main reasons for the excessive iron and manganese ions in the water body are as follows: 1) Iron and manganese are common heavy metal ions in soil and sediment. In some areas, iron and manganese content in soil and sediment are very high, and they are easy to be released under certain conditions. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 王津南李爱民许丽王琼杰双陈冬
Owner NANJING UNIV
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