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Membrane coupling method for treating high-salt and high-ammonia-nitrogen wastewater

A high ammonia nitrogen and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Time, high water recovery rate and light membrane fouling effect

Active Publication Date: 2016-09-21
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.

Method used

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  • Membrane coupling method for treating high-salt and high-ammonia-nitrogen wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt and high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH 8.5, conductivity 5mS / cm, COD cr 80mg / L, SS100mg / L, Na + 1000mg / L, NO 3 - 2000mg / L, Cl - 50mg / L, Ca 2+ 0mg / L, NH 4 -N500mg / L.

[0054] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the reverse osmosis membrane module used is a polyamide coiled membrane module with a membrane pore size less than 1 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0055] The steps are as follows: (1) membrane absorption, high-salt and high-ammonia-nitrogen wastewater 1 enters the membrane absorption raw water tank 2, and the high-salt and high-ammonia nitrogen wastewater in the membrane absorption raw water tank 2 is pumped into the feed liquid s...

Embodiment 2

[0060] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt and high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH9.3, conductivity 25mS / cm, COD cr 80mg / L, SS100mg / L, Na + 5000mg / L, NO 3 - 10000mg / L, Cl - 270mg / L, Ca 2+ 20mg / L, NH 4 -N6000mg / L.

[0061] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the reverse osmosis membrane module used is a polyamide coiled membrane module with a membrane pore size less than 1 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0062] What is different from Example 1 in the operation steps is that: the absorption liquid used in the step (1) is a nitric acid solution with a concentration mass fraction of 7%; when the pH of the ammonium nitrate solution in the step (1) reaches 4, enter the step (2 ) Concent...

Embodiment 3

[0067] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt and high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH 10, conductivity 50mS / cm, COD cr 80mg / L, SS200mg / L, Na + 10000mg / L, NO 3 - 20000mg / L, Cl - 500mg / L, Ca 2+ 30mg / L, NH 4 -N10000mg / L.

[0068] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the reverse osmosis membrane module used is a polyamide coiled membrane module with a membrane pore size less than 1 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0069] The operating steps are different from Example 1 in that: the absorption liquid used in the step (1) has a concentration mass fraction of 10 % hydrochloric acid solution; when the pH of the ammonium chloride solution in step (1) reaches 5, enter step (2) for concentrated t...

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Abstract

The invention discloses a method used for processing high-salt high-ammonia-nitrogen waste water via membrane coupling. The method comprises steps of membrane absorption, reverse osmosis, and forward osmosis coupling. According to the method, an acid solution is taken as an absorption liquid, ammonia nitrogen in waste water is changed into ammonium salts via membrane absorption; obtained ammonium salt solution is concentrated further via reverse osmosis; the concentrated ammonium salt solution is taken as a driving liquid of forward osmosis, a high-salt waste water obtained after ammonia nitrogen removing via membrane absorption is taken as a feed liquid of forward osmosis, and forward osmosis concentration is carried out; the driving liquid ammonium salt solution is diluted, and a part of the ammonium salt solution is recycled to a reverse osmosis unit for recycling concentration. The method is capable of solving processing problems of high-salt high-ammonia-nitrogen waste water, water recovery yield is high, and quality of obtained water is excellent. The method is used for recycling concentration of high-salt high-ammonia-nitrogen waste water, concentrated water discharge amount is extremely low, and recovery of high-salt high-ammonia-nitrogen waste water is realized as far as possible.

Description

technical field [0001] The invention relates to a method for treating high-salt and high-ammonia-nitrogen wastewater by using membrane separation technology, more specifically, a method for treating high-salt and high-ammonia-nitrogen wastewater by using membrane absorption + reverse osmosis + forward osmosis coupling technology, which belongs to industrial wastewater treatment field. 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. The ammonia nitrogen in the wastewater mainly exists in the form of ammonium ions (NH4+), which is an important cause of water eutrophication and environmental pollution. Substances can easily cause algae and other microorganisms to multiply in the water. In severe cases, the dissolved oxygen in the water will drop, fish will die in large numbers, and eve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44
Inventor 张新妙杨永强彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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