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Method for removing perchlorate in water

A perchlorate and water removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as low treatment efficiency, low selectivity, and difficult regeneration of perchlorate. Achieve the effects of short reaction time, high processing efficiency and strong practical value

Inactive Publication Date: 2016-08-31
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the disadvantages of the current adsorption method, such as difficult regeneration of perchlorate, low selectivity, difficult treatment of regeneration solution, and high operating costs; The existing problems such as low treatment efficiency provide an economically feasible, good treatment effect and stable operation method for removing perchlorate in water by combining magnetic ion exchange resin and microbial reduction, that is, the biological resin method to remove perchloric acid in water Salt, especially for the removal of perchlorate in slightly polluted water

Method used

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  • Method for removing perchlorate in water
  • Method for removing perchlorate in water
  • Method for removing perchlorate in water

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1 (comparative example)

[0032] Take 1 mL each of biomagnetic resin, magnetic resin and PRB mixed bacterial pages and place them in 250 mL serum bottles, and add 150 mL of the culture solution described in the above step (1) and 10 mg / L ClO to each serum bottle. 4 - and 40mg / L of CH3COO - , the reaction conditions are shown in Table 1. The rotating speed on the shaker is 120rpm, the treatment period is 12h, and the residual content of perchlorate in the water is detected. Then all the resins do not undergo any regeneration, pour the upper layer culture solution, and add fresh culture solution, which is the same as the first cycle, so that 4 cycles are performed to compare the treatment effects of the three, and the results are as follows figure 1 shown. Depend on figure 1 It can be seen that after 4 consecutive uses, the BMIEX resin still maintains a high perchlorate removal rate, while the adsorption capacity of the magnetic resin is quickly exhausted ...

Embodiment 2

[0036] established as figure 2 In the shown reactor, 1 is a perchlorate-contaminated raw water pool, which is used to hold perchlorate-contaminated water to be treated; 2 is an automatic controller, which is the overall director of the operation of the whole device. Mainly control the timing opening and closing of peristaltic pump 4, stirring paddle 61, electromagnet 3 and water outlet valve 62; 5 is the water inlet pipe; 6 is the cylindrical mixing reactor, which is the reaction place, and there is stirring paddle 61 inside to ensure sufficient mixing; 7 is the place where the carbon source is added, when the carbon source in the water is insufficient, it is used to supplement the carbon source; 8 is the control circuit, connected with the automatic controller 2; 9 is the air bag, which is used to collect the gas produced in the reaction process and keep The balance of the air pressure inside and outside the reactor; 63 is a sealing plug to ensure the anaerobic environment i...

Embodiment 3

[0038] established as figure 2 In the shown reactor, the artificial water distribution (that is, the above-mentioned medium) containing 25mg / L perchlorate and 100mg / L sodium acetate is placed in pool 1, and 100mL of biomagnetic resin obtained by the above method is placed in In the mixing reactor 6, the volume of the reactor is 10L, and the processing process is realized by the automatic controller 2 through the control circuit 8. The automatic control process is as follows: the peristaltic pump 4 is turned on, and the water inlet flow rate is 2L / min. After 4 minutes, the peristaltic pump 4 close, and the stirring paddle 61 rotates at the same time, the rotating speed is 70rpm, the reaction starts, and the treatment is completed after 7h. The water outlet valve 62 is opened, and all the treated water is discharged after 2 minutes. At this time, the water outlet valve 62 is closed, the electromagnet is turned off, and the peristaltic pump 4 is opened simultaneously to start th...

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Abstract

Provided is a method for removing perchlorate in water. Magnetic resin can adsorb and concentrate perchlorate in water rapidly, perchlorate reducing bacteria can reduce perchlorate biologically into harmless chloride ions, and the two effects are combined, so that the magnetic resin is loaded with biological film, and bio-magnetic resin capable of conducting adsorption and bio-regeneration simultaneously is formed to concentrate perchlorate from big-size water to small-size biological resin; meanwhile, the magnetic resin is utilized to adsorb organic matter in water, so that the perchlorate reducing bacteria loaded on the magnetic resin have sufficient carbon source to biologically reduce the concentrated perchlorate into harmless chloride ions. According to the method, the resin adsorption method and the biological reduction method are combined, harmlessness of perchlorate and regeneration of resin adsorbent are simultaneously achieved, and the final effective removal rate of perchlorate reaches over 95%; meanwhile, the method has the advantages of short response time, high treatment efficiency, repeated use and the like, and has high practical value for advanced treatment of water.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for removing perchlorate in water. Background technique [0002] Perchlorate (ClO 4 - ) is one of the main inorganic pollutants in the environment, widely present in surface water, groundwater and soil. Perchlorate in the environment mainly comes from military, agriculture and industry. In these fields, perchlorate is mainly used as a solid oxidizer for rockets, missiles, fireworks, etc., raw materials for chemical fertilizers, leather processing, automotive airbags, and rubber manufacturing. , paint and lubricant production additives. The regular tetrahedral structure of perchlorate gives it high chemical stability and good mobility, which determine the difficulty of its removal and become a major challenge for environmental engineers, scientists and government decision makers. As an endocrine disruptor, perchlorate will interfere with the use of iodine by the ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/28C02F101/30C02F101/12
CPCC02F3/34C02F1/42C02F1/488C02F3/2806C02F2101/12C02F2101/30C02F2303/14C02F2303/16
Inventor 王帅锋吴敏高乃云朱延平牛明星李硕黎雷王志远贺晓光
Owner TONGJI UNIV
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