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Method for gas membrane-process treatment of ammonia-containing feed liquid or wastewater with renewable absorbent and by-producted strong aqua ammonia

A technology of gaseous membranes and absorbents, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high energy consumption, large sales of ammonium sulfate, and market price of ammonium sulfate Not advanced question

Active Publication Date: 2014-12-17
TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, evaporation crystallization usually adopts a multi-effect evaporation process, which requires high equipment investment and high energy consumption.
Since the market price of ammonium sulfate is not high, if the enterprise cannot fully recycle, the sale of the obtained ammonium sulfate is also a big problem

Method used

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  • Method for gas membrane-process treatment of ammonia-containing feed liquid or wastewater with renewable absorbent and by-producted strong aqua ammonia
  • Method for gas membrane-process treatment of ammonia-containing feed liquid or wastewater with renewable absorbent and by-producted strong aqua ammonia
  • Method for gas membrane-process treatment of ammonia-containing feed liquid or wastewater with renewable absorbent and by-producted strong aqua ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Gas membrane deamination process: The polypropylene microporous hydrophobic hollow fiber gas membrane module is used to treat ammonia-containing solution. The effective membrane area is 19m 2 , The parameters of the membrane silk are: outer diameter 0.48mm, inner diameter 0.38mm, average pore diameter 0.02μm, porosity 40%. Three membrane modules are used in series.

[0066] Feed liquid: Ammonia nitrogen wastewater from a pharmaceutical factory, after pretreatment such as foam separation, ultrafiltration, and alkali addition, the surface tension is 68mN / m, pH=11.3, the concentration of ammonia nitrogen in the influent C0=1918ppm, the flow rate Q=300L / h, the temperature T=30℃;

[0067] Ammonium dihydrogen phosphate solution absorption liquid: initial pH is 4.6, initial density is 1.18kg / L, inlet flow rate is 15L / h, temperature is 30°C.

[0068] Experimental results: The concentration of ammonia nitrogen in the effluent is 45mg / L, the removal rate of ammonia nitrogen is...

Embodiment 2

[0078] Gaseous membrane deamination process: use polypropylene gaseous membrane modules to treat ammonia-containing solutions. The effective membrane area is 19m 2 , The parameters of the membrane are: outer diameter 0.48mm, inner diameter 0.38mm, average pore diameter 0.02μm, porosity 40%. Three membrane modules are used in series.

[0079] Feed liquid: ammonia nitrogen wastewater from a chemical plant, the concentration of ammonia nitrogen in the influent is C0=2480ppm, the flow rate is Q=400L / h, pH=12.0, temperature T=30℃;

[0080] Ammonium dihydrogen phosphate solution absorption liquid: initial pH is 5.8, initial density is 1.18kg / L, flow rate is 20L / h, temperature is 30°C.

[0081] Experimental results: the concentration of ammonia nitrogen in the effluent is 86mg / L, the removal rate of ammonia nitrogen is 96.5%, the pH of the outlet of the absorption liquid is 8.4, and the flow rate is 24L / h.

[0082] Regeneration process of absorption liquid by rectification method:...

Embodiment 3

[0089] Gas membrane deamination process: PTFE gaseous membrane modules are used to treat ammonia-containing solutions. The effective membrane area is 10.5m 2 , The parameters of the membrane are: outer diameter 1.2mm, inner diameter 0.60mm, average pore diameter 0.10μm, porosity 65%, three membrane modules are used in series.

[0090] Feed liquid: ammonia nitrogen wastewater from a pharmaceutical factory, the concentration of ammonia nitrogen in the influent C0=1460ppm, the flow rate Q=300L / h, pH=12.5, the temperature T=30℃, the initial surface tension is 35.0mN / m, multi-stage foam separation and super Surface tension increased to 58mN / m after filtration pretreatment;

[0091] Ammonium dihydrogen phosphate solution absorption liquid: initial pH is 5.6, initial density is 1.18kg / L, flow rate is 15L / h, temperature is 30°C.

[0092] Experimental results: The concentration of ammonia nitrogen in the effluent is 12mg / L, the removal rate of ammonia nitrogen is 99.2%, the pH value ...

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Abstract

The invention relates to a method for gas membrane-process treatment of ammonia-containing wastewater or feed liquid with a renewable absorbent and by-producted strong aqua ammonia, wherein the method includes a gas membrane-process deamination step, an absorption complete liquid distillation regeneration step and a regeneration absorption liquid concentration step. The ammonia-nitrogen concentration in the wastewater is decreased to 50 mg / L or 15 mg / L or even 5 mg / L or less, at the same time, ammonia nitrogen in the wastewater is recycled to obtain high-purity strong aqua ammonia as a by-product, the absorbent is renewable and recycled, no secondary pollution exists, energy consumption is low, the power consumption is less than 1 degree per ton of the wastewater, and the steam consumption is less than 0.04 ton per ton of the wastewater even as low as 0.02 ton of steam per ton of the wastewater. By contrast, the thermal energy consumption of simply adopting a rectification process to treat the same wastewater is usually 0.12-0.18 ton of the steam per ton of the wastewater.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating ammonia nitrogen wastewater or feed liquid by a gaseous membrane method in which the absorbent is regenerated and concentrated ammonia water is by-produced. Background technique [0002] Many industries, including petrochemicals, fine chemicals, fertilizers, coal chemicals, pharmaceuticals, pesticides, non-ferrous and rare metal smelting, electronics and municipal waste treatment, etc. produce ammonia-containing feed liquid or discharge ammonia-containing wastewater, and the estimated national daily discharge is several million tons , and its ammonia concentration ranges from tens to tens of thousands of milligrams per liter (mg / L). Ammonia nitrogen in wastewater is an important substance for water eutrophication and environmental pollution. It can easily cause algae and some microorganisms to multiply in a short period of time, and consume dissolved oxygen i...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 秦英杰刘立强崔东胜蔡腾豪郝兴阁李海庆
Owner TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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