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High salinity ammonia nitrogen wastewater treatment method

A technology of ammonia nitrogen wastewater and treatment method, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , membrane fouling of membrane distillation, etc., to achieve the effect of extending continuous and stable operation time, ensuring long-term stable operation and light membrane fouling

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method recovers the ammonia in the wastewater, the treated wastewater can only be discharged up to the standard, and the purpose of water resource reuse cannot be realized.
In addition, the Chinese patent CN201010210974 relates to a method for the treatment and reuse of ammonia nitrogen-containing high-salt catalyst wastewater. The process of "acid adjustment + microfiltration + membrane distillation + cooling crystallization" is adopted to solve the problem of ammonia nitrogen-containing high-salt catalyst wastewater. Deal with the problem of reuse, but this method needs to concentrate the concentrated water of membrane distillation to a higher concentration before entering the subsequent cooling and crystallization step, which leads to serious membrane fouling of membrane distillation, which is not conducive to the long-term stable operation of the membrane distillation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of the high-salt ammonia nitrogen wastewater 15 in the figure are: wastewater pH 7.2, conductance 15mS / cm, COD cr 60mg / L, SS130mg / L, Ca 2+ 25mg / L, Cu110mg / L, Zn32mg / L, NH 4 -N390mg / L. Forward osmosis raw water 1 is a glucose solution with a mass concentration of 5%.

[0058] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0059]The steps are as follows: (1) adjust the pH of the high-salt ammonia-nitrogen wastewater 15 to 6; (2) the adjusted high-salt ammonia-nitrogen wastewater enters the membrane distillation heating pool 9 and is ...

Embodiment 2

[0064] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of the high-salt ammonia nitrogen wastewater 15 are the same as those in Example 1. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.

[0065] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0066] In the operation steps, what is different from Example 1 is: the pH of the high-salt ammonia nitrogen wastewater 15 is adjusted to 5; the adjusted high-salt ammonia nitrogen wastewater is heated to 70°C in the membrane distillation heating pool; when the membrane distillation heating pool 9 When the conductivity of...

Embodiment 3

[0071] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of high-salt ammonia nitrogen wastewater 15 in the figure are: wastewater pH 5, conductance 50mS / cm, COD cr 80mg / L, SS500mg / L, Ca 2+ 30mg / L, Cu200mg / L, Zn50mg / L, NH 4 -N500mg / L. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.

[0072] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0073] In the operation steps, the difference from Example 1 is: the pH of the high-salt ammonia nitrogen wastewater 15 is adjusted to 4; the adjusted high-salt ammonia nitrogen wastewater is heated to 70°C in the membrane dist...

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Abstract

The invention discloses a high salinity ammonia nitrogen wastewater treatment method. The method adopts an acid adjustment + membrane distillation + forward osmosis process flow. The method is characterized in that acidity adjustment pretreatment of high salinity ammonia nitrogen wastewater is carried out according to the characteristics of wastewater and the characteristic of most ammonia nitrogen existing in the ammonia nitrogen wastewater with a low pH value as NH<+>, a membrane distillation technology is adopted to concentrate the acid adjusted high salinity ammonia nitrogen wastewater, high salinity membrane distilled concentrated water is used as a driving liquid of forward osmosis and is diluted through the continuous concentration of raw water at a forward osmosis inlet liquid side, and when the membrane distilled concentrated water is diluted to a specific concentration, the diluted concentrated water returns to a membrane distillation unit and is continuously concentrated. The process flow is cycled, and the advanced concentration treatment of the high salinity ammonia nitrogen wastewater is carried out to obtain a large amount of pure water and solve a problem that the membrane distilled concentrated water generated in the high salinity ammonia nitrogen wastewater treatment is difficult to treat, so the wastewater recovery rate is maximally improved, and the method has important environmental benefits.

Description

technical field [0001] The invention relates to a method for treating high-salt ammonia-nitrogen wastewater by using membrane separation technology, more specifically, relates to a method for treating high-salt ammonia-nitrogen wastewater by forward osmosis coupling membrane distillation technology, which belongs to the field of industrial wastewater treatment. Background technique [0002] Ammonium salts and ammonia water are used in many places in the catalyst production process of the petrochemical industry. Therefore, the discharged catalyst wastewater contains a large amount of ammonia nitrogen, and the ammonia nitrogen in the wastewater is mainly ammonium ion (NH 4 + ) is an important substance that leads to eutrophication of water bodies and environmental pollution. It can easily cause algae and other microorganisms to multiply in water. In severe cases, dissolved oxygen in water will drop, fish will die in large numbers, and even lakes will dry up. Increase the amou...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 张新妙彭海珠杨永强万国晖
Owner CHINA PETROLEUM & CHEM CORP
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