Zero release method of high-salt high-ammonia-nitrogen waste water

A high-ammonia-nitrogen, zero-discharge technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as the inability to realize the purpose of water resource reuse, and achieve good water quality and water recovery high rate effect

Active Publication Date: 2015-05-13
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

Method used

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  • Zero release method of high-salt high-ammonia-nitrogen waste water

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 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;

[0055] Proceed as follows:

[0056] (1) Membrane absorption: high-salt and high-ammonia-nitrogen wastewater is pumped into the feed liquid side of the membrane absorption unit for circulation; as the absorption liquid, sulfuric acid with a concentration mass fraction of 5% is pumped into t...

Embodiment 2

[0065] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt, 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.

[0066] 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;

[0067] What is different from Example 1 in the operation steps is: the absorption liquid used in the step (1) is a sulfuric acid solution with a concentration mass fraction of 7%; the coolant for the cooling crystallization unit adopts water with ice cubes; when the step (1) When the pH o...

Embodiment 3

[0072] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt, 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.

[0073] 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;

[0074] What is different from Example 1 in the operation steps is that: the absorption liquid used in the step (1) is a sulfuric acid solution with a concentration mass fraction of 10%; the cooling agent for cooling crystallization adopts tap water; when the pH of the ammonium sulfate so...

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Abstract

The invention discloses a treatment method of high-salt high-ammonia-nitrogen waste water. The treatment method comprises steps of membrane absorption, nanofiltration, forward osmosis, and cooling crystallization. According to the treatment method, a sulfuric acid solution is taken as an absorption liquid, ammonia nitrogen in waste water is changed into ammonium sulfate via membrane absorption; obtained ammonium sulfate solution is concentrated further via nanofiltration; the concentrated ammonium sulfate 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 ammonium sulfate solution is diluted, and a part of the diluted ammonium sulfate solution is recycled to a nanofiltration unit for concentration of a second time; after a plurality of forward osmosis concentration, concentrated water of a forward osmosis unit is subjected to cooling crystallization; and an obtained supernate is recycled for circulating concentration, and obtained crystal is dried and is subjected to concentrated disposal. The treatment method is used for treatment of high-salt high-ammonia-nitrogen waste water, almost no concentrated water is discharged, problems of high-salt high-ammonia-nitrogen waste water treatment are solved effectively, water recovery rate is high, quality of obtained water is high, and recovery of water resource of high-salt high-ammonia-nitrogen waste water is realized as far as possible.

Description

technical field [0001] The invention relates to a zero-discharge method for treating high-salt and high-ammonia-nitrogen wastewater by using membrane separation technology, more specifically, a zero-discharge method for treating high-salt and high-ammonia-nitrogen wastewater by using membrane absorption + nanofiltration + forward osmosis + cooling crystallization coupling technology The discharge method belongs to the field of industrial waste water 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 oxy...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/16
Inventor 张新妙赵鹏平春霞
Owner CHINA PETROLEUM & CHEM CORP
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