High salinity and high ammonia nitrogen wastewater treatment method

A treatment method and high-ammonia nitrogen technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of running time, high ammonia nitrogen removal rate and high water recovery rate

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

AI Technical Summary

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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  • High salinity and high ammonia nitrogen wastewater treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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, SS 100mg / L, Na + 1000mg / L, NO 3 - 2000mg / L, Cl - 50mg / L, Ca 2+ 0mg / L, NH 4 -N 500mg / L.

[0055] 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 nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0056] The steps are as follows: (1) film absorption. High-salt and high-ammonia-nitrogen waste water 1 enters the membrane absorption raw water tank 2, and the high-salt and high-ammonia nitrogen waste water in the membrane absorption raw water tank 2 is pumped into the feed liquid s...

Embodiment 2

[0061] 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 9.3, conductivity 25mS / cm, COD cr 80mg / L, SS 100mg / L, Na + 5000mg / L, NO 3 - 10000mg / L, Cl - 270mg / L, Ca 2+ 20mg / L, NH 4 -N 6000mg / L.

[0062] 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 nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0063] The operating steps are different from Example 1 in that: the absorption liquid used in the step (1) has a concentration mass fraction of 7 % sulfuric acid solution; after step (1) when the pH of the ammonium sulfate solution reaches 4, enter step (2) concentration treatm...

Embodiment 3

[0068] 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 -N 10000mg / L.

[0069] 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 nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;

[0070] 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 % sulfuric acid solution; after step (1) when the pH of the ammonium sulfate solution reaches 5, enter step (2) concentration treat...

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Abstract

The invention discloses a high salinity and high ammonia nitrogen wastewater treatment method. The method adopts a membrane absorption + nanofiltration + forward osmosis process flow. The method comprises the following steps: converting ammonia nitrogen in wastewater by adopting membrane absorption with a sulfuric acid solution as an absorption liquid to form ammonium sulfate; concentrating the ammonium sulfate solution through adopting nanofiltration; carrying out forward osmosis concentration treatment with the concentrated ammonium sulfate solution as a forward osmosis driving liquid and the high salinity wastewater with ammonia nitrogen removed through the membrane absorption as a forward osmosis inlet liquid; and diluting the ammonium sulfate solution as the driving liquid, and returning parts of the diluted ammonium sulfate solution to a nanofiltration unit for cycle concentration treatment. The method effectively solves the treatment problem of the high salinity and high ammonia nitrogen wastewater, allows the water recovery rate to be high, and allows the quality of produced water to be good. The method is adopted to carry out cycle concentration treatment of the high salinity and high ammonia nitrogen wastewater, so the discharge amount of concentrated water is extremely small, and the water resource in the high salinity and high ammonia nitrogen wastewater is maximally recovered.

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 + nanofiltration + 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, 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 dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/16
Inventor 张新妙栾金义谢梓峰
Owner CHINA PETROLEUM & CHEM CORP
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