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A resource treatment system and method for molybdenum-containing low-concentration nh4cl wastewater

A treatment system and low-concentration technology, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of large consumption of chemicals and energy, unstable operation, high material requirements, etc., to achieve unlimited The effect of secondary pollution and low operating cost

Active Publication Date: 2016-04-13
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problems of the traditional ammonium chloride wastewater treatment method, such as high equipment material requirements, large consumption of chemicals and energy, large output of secondary sludge or secondary salt, low recovery rate of ammonia resources, and unstable operation, the present invention proposes an equipment material Treatment system and method for Mo-containing low-concentration ammonium chloride wastewater requiring low consumption, no secondary pollution, and high resource recovery rate

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  • A resource treatment system and method for molybdenum-containing low-concentration nh4cl wastewater

Examples

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Embodiment 1

[0055] Ammonium chloride wastewater containing Mo in a factory (Mo content is 150mg / L, NH 4 Cl content is 0.1%), wastewater pH=3.5.

[0056] (1) Take 100L of the above wastewater, and add sodium hydroxide to the pH adjustment tank 1 to adjust the pH to 10;

[0057] (2) The wastewater coming out of the first pH adjustment tank first passes through the filter to remove possible precipitates, and then enters the hydrophobic membrane module for deamination, using 50L, 1% HCl as the ammonia absorption solution, and the ammonia nitrogen concentration is reduced to below 7ppm;

[0058] (3) The deaminized wastewater from the hydrophobic membrane module enters the sulfidation sedimentation tank, and n(Mo:Na 2 S) = 1:1 sodium sulfide as precipitant; 0.2% ammonium chloride absorption solution from the hydrophobic membrane module enters the first set of bipolar membrane for acid-base regeneration, and 0.1% to 1% ammonia water and 1% ~1.6% hydrochloric acid;

[0059] (4) The wastewater ...

Embodiment 2

[0064] Ammonium chloride wastewater containing Mo in a factory (Mo content is 1000mg / L, NH 4 Cl content is 2%), wastewater pH=7.

[0065] (1) Take 100L of the above wastewater, and add sodium hydroxide to the first pH adjustment tank to adjust the pH to 11;

[0066] (2) The wastewater from the first pH adjustment tank first enters the filter to remove possible precipitates, and then enters the hydrophobic membrane module for deamination, using 50L, 2% HCl as the ammonia absorption solution, and the ammonia nitrogen concentration is reduced to below 1ppm;

[0067] (3) The deaminated wastewater from the hydrophobic membrane module enters the sulfidation sedimentation tank, and n (Mo: Na 2 S) = 1:2 sodium sulfide as precipitant; 4% ammonium chloride absorption solution from hydrophobic membrane module enters the first set of bipolar membrane device for acid-base regeneration, and 0.5% to 3% ammonia water and 2 %~6% hydrochloric acid;

[0068] (4) The wastewater from the sulfid...

Embodiment 3

[0073] Ammonium chloride wastewater containing Mo in a factory (Mo content is 3500mg / L, NH 4 Cl content is 6%), wastewater pH=6.

[0074] (1) Take 100L of the above wastewater, and add sodium hydroxide to the first pH adjustment tank to adjust the pH to 10;

[0075] (2) The wastewater coming out of the first pH adjustment tank first passes through the filter to remove possible precipitates, and then enters the hydrophobic membrane module for deamination, using 50L of 5% HCl as the ammonia absorption solution, and the ammonia nitrogen concentration is reduced to below 5ppm;

[0076] (3) The deaminized wastewater from the hydrophobic membrane module enters the sulfidation sedimentation tank, and n(Mo:Na 2 S) = 1:2 sodium sulfide as precipitant; 10% ammonium chloride absorption solution from hydrophobic membrane module enters the first set of bipolar membrane for acid-base regeneration, and 3% to 6% ammonia water and 5% ammonium chloride can be obtained ~10% hydrochloric acid; ...

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Abstract

A resource treatment system for Mo-containing low-concentration NH4Cl wastewater, the system includes a first pH adjustment tank, a hydrophobic gas membrane module, a sulfide sedimentation tank, a filter, a first set of bipolar membrane devices, a second pH adjustment tank, The second set of bipolar membrane device; the outlet of the first pH adjustment tank is connected to the water inlet of the hydrophobic gas membrane module, the outlet of the ammonia absorption liquid of the hydrophobic gas membrane module is connected to the first set of bipolar membrane device, and the outlet of the deamination wastewater is connected to the sulfide The water inlet of the sedimentation tank is connected, the water outlet of the vulcanization sedimentation tank is connected to the second pH adjustment tank, the water outlet of the second pH adjustment tank is connected to the water inlet of the filter, and the water outlet of the filter is connected to the second set of bipolar membrane device; The invention mainly solves the shortcomings of the traditional Mo-containing ammonium chloride wastewater treatment process, such as high equipment material requirements, large consumption of chemicals and energy, and large secondary salt output. The process can not only realize the resources of more than 99% of Mo, ammonia nitrogen and Cl- It can be recycled or reused, and the effluent can be discharged or reused stably up to the standard. It has the advantages of less consumption, low operating cost and zero discharge of wastewater.

Description

technical field [0001] The invention belongs to the field of advanced treatment of wastewater, in particular to a method for treating wastewater containing Mo and low-concentration ammonium chloride. Background technique [0002] Both heavy metal and ammonia nitrogen content are important indicators to measure water quality. If ammonia nitrogen wastewater containing heavy metals is discharged directly without treatment, it will not only cause serious pollution to the environment, but also cause waste of rare heavy metal resources and ammonia resources. Therefore, it is necessary to carry out resourceful and harmless treatment of Mo-containing low-concentration ammonium chloride wastewater before discharge. Traditional methods for treating low-concentration ammonia-nitrogen wastewater containing Mo mainly include biological, chemical, and physicochemical methods. [0003] The biological method mainly applies the principle of biological nitrification and denitrification, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G39/06
CPCC01G39/06C02F1/44C02F1/441C02F1/52C02F1/66C02F9/00C02F2101/16C02F2101/20
Inventor 林晓李志强刘晨明
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH