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Method for processing ammonia-nitrogen wastewater

A technology for ammonia nitrogen wastewater and wastewater, applied in the direction of anaerobic digestion treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problem of increasing the pH value of the solution, reducing the activity and reproduction speed of anammox bacteria, and reducing wastewater treatment capacity and other issues, to achieve the effect of high denitrification efficiency, conducive to mass growth and reproduction, and good treatment effect

Inactive Publication Date: 2018-09-21
BEIJING INST OF COLLABORATIVE INNOVATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when zero-valent iron is used for anaerobic ammonium oxidation method to treat wastewater, there are significant defects. The pH value of the solution in the reactor increases, which reduces the activity and reproduction speed of anammox bacteria and reduces the wastewater treatment capacity.

Method used

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  • Method for processing ammonia-nitrogen wastewater
  • Method for processing ammonia-nitrogen wastewater
  • Method for processing ammonia-nitrogen wastewater

Examples

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Effect test

Embodiment 1

[0040] This embodiment relates to the preparation of zero-valent iron loaded on montmorillonite, comprising the following steps:

[0041] 1) Configure 40g / L montmorillonite suspension, dissolve 9.6g ferric chloride hexahydrate in water, and prepare ferric chloride solution;

[0042] 2) Under the protection of nitrogen, add the ferric chloride solution to 50mL of montmorillonite suspension, stir until evenly mixed, then add 100mL of 1M sodium borohydride aqueous solution, stir quickly until the reaction is complete, and filter with suction , washed with pure water, and vacuum-dried at 50-80° C. to obtain zero-valent iron (MMT-ZVI) supported on montmorillonite.

Embodiment 2

[0044] This embodiment relates to the operation of utilizing the method of the present invention to treat nitrogen-containing wastewater, comprising the following steps:

[0045] 1) The ferric chloride and 10g MLSS anaerobic ammonium oxidation sludge prepared by the 5g montmorillonite load prepared in embodiment 1 are added in the 5L SBR (sequencing batch type) reactor, add the wastewater to be treated, ammonia nitrogen and The initial concentration of nitrite nitrogen is 53mg / L and 50mg / L respectively, the concentration of sludge after adding wastewater is 2g MLSS / L, and the concentration of montmorillonite loaded with zero-valent iron carrier is 1g / L;

[0046] 2) An anaerobic environment is maintained in the SBR reactor, the temperature is controlled at 37°C, the hydraulic retention time is 36h, the water exchange ratio is 2, and a cycle is 18h, in which the water outlet time is 10min, the water inlet time is 20min, and the precipitation time is 30 minutes. Stir The reaction...

Embodiment 3

[0049] Compared with Example 2, the difference is that the added amount of the montmorillonite loaded with zero-valent iron is 0.2g, that is, its concentration in the wastewater is 0.04g / L.

[0050] The monitoring result of the effluent in the 18th hour was that the pH of the effluent was 7.9, the concentration of ammonia nitrogen was 25 mg / L, the removal rate dropped to 52%, the concentration of nitrite nitrogen was 15, the removal rate was 70%, the concentration of nitrate nitrogen was 9 mg / L, and the total nitrogen The removal rate was reduced to 52.4%.

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Abstract

The invention relates to a method for processing ammonia-nitrogen wastewater. As an improvement, nitrogen-containing wastewater is processed through zero-valent iron loaded on montmorillonite and naerobic ammonium oxidation bacteria. The nitrogen-containing wastewater is processed through the zero-valent iron (MMT-ZVI) loaded on the montmorillonite and activated sludge through coupling; compared with a method of only adding the zero-valent iron ZVI without adding the MMT-ZVI, active sites of the zero-valent iron loaded on the montmorillonite are increased, stability is enhanced, and the denitrification efficiency is higher. By means of the method, compared with the method of only adding the zero-valent iron, the water outlet pH is stable and cannot goes beyond the normal range, the water pH does not need to be specially adjusted, the great growth and reproduction of microorganisms are facilitated in the wastewater long-term treatment process, and a good treatment effect can be kept fora long time.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for assisting the treatment of nitrogen-containing waste water by using montmorillonite loaded with zero-valent iron. Background technique [0002] Anaerobic ammonium oxidation (Anammox) technology is a new type of autotrophic biological denitrification process, which has outstanding advantages in treating wastewater with low C / N ratio and high concentration of ammonia nitrogen. However, since the anammox bacteria are autotrophic microorganisms, the growth rate is very slow, which makes it very slow to start an anammox reactor; at the same time, the generation of nitrate nitrogen in this process leads to incomplete denitrification and other problems, which seriously limits Industrialized development of anaerobic ammonium oxidation process. [0003] The method of zero-valent iron coupled with anammox for efficient treatment of nitrogen-containing wastewater can effec...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/282C02F2101/16C02F2305/06
Inventor 刘思彤杨雪彤宋少先揭靖成
Owner BEIJING INST OF COLLABORATIVE INNOVATION
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