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Novel absorbent for treating ammonia-containing wastewater or feed liquid by gaseous membrane method

A technology of absorbent and gaseous membrane, applied in water/sewage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc.

Active Publication Date: 2020-10-27
TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing wastewater deamination technology, the present invention provides a new type of absorbent for treating ammonia-containing wastewater or feed liquid by gaseous membrane method. Using this type of absorbent, the ammonia nitrogen content in wastewater or feed liquid can be reduced. Treat to below 50mg / L or 15mg / L or even 5mg / L

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  • Novel absorbent for treating ammonia-containing wastewater or feed liquid by gaseous membrane method
  • Novel absorbent for treating ammonia-containing wastewater or feed liquid by gaseous membrane method
  • Novel absorbent for treating ammonia-containing wastewater or feed liquid by gaseous membrane method

Examples

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Effect test

Embodiment 1

[0041] Feed liquid: a factory ternary precursor mother liquor wastewater, pH = 13.5, ammonia nitrogen concentration of about 6000mg / L, sulfate ion concentration of 70g / L, surface tension of 70mN / m, slightly turbid, passed through an ultrafiltration membrane with a molecular weight cut-off of 50000 After treatment, it enters the gaseous membrane deamination device. The ultrafiltration process is well known to those skilled in the art and will not be emphasized here.

[0042] Gaseous membrane deamination process: use polypropylene gaseous membrane modules to treat ammonia-containing solutions. The effective membrane area is 65m 2 , The parameters of the membrane silk are: outer diameter 0.53mm, inner diameter 0.40mm, average pore diameter 0.02μm, porosity 50%. The three components are used in series, the water inlet flow rate is 800L / h, the inlet operating pressure is 0.042MPa, and the operating temperature is 35°C.

[0043] Absorbing solution: Potassium dihydrogen phosphate ...

Embodiment 2

[0050] Feed liquid: wastewater from a non-ferrous metal smelter, ammonia nitrogen 1500-2000mg / L, temperature 30°C, pH=12.2, surface tension 72mN / m after pretreatment such as sand filtration and ultrafiltration; devices involved in the pretreatment process and steps are well known to those skilled in the art and will not be emphasized here.

[0051] Gas membrane deamination process: use polypropylene microporous hydrophobic hollow fiber gas membrane module for treatment. The effective membrane area is 65m 2 , The parameters of the membrane silk are: outer diameter 0.53mm, inner diameter 0.40mm, average pore diameter 0.02μm, porosity 50%. Three membrane modules are used in series, the water flow rate is 700L / h, and the inlet operating pressure is 0.04MPa.

[0052] Absorbing solution: Industrial grade sodium dihydrogen phosphate is used to prepare an aqueous solution with a mass fraction of 35%. The measured initial pH is about 3.49. It circulates in the shell side of the gaseo...

Embodiment 3

[0058] Feed liquid: Ammonia nitrogen wastewater from a pharmaceutical factory, yellow and slightly turbid, the concentration of ammonia nitrogen in the influent is 1460mg / L, pH=11.8, temperature 30°C, surface tension 62mN / m; treated by polysulfone ultrafiltration membrane with a molecular weight cut-off of 50,000 Enter the gaseous membrane deamination device. The ultrafiltration process is well known to those skilled in the art and will not be emphasized here.

[0059] 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, the flow rate is 300L / h.

[0060] Absorbing solution: Add methylamine solution dropwise to 30% phosphoric acid solution to make the pH reach 4.0, used as absorbent for gaseous membrane process; ...

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Abstract

The invention relates to a novel absorbent for treating ammonia-containing wastewater or feed liquid by a gaseous membrane method and an application method thereof. The absorbent mainly comprises dihydric phosphate of alkali metal or a mixture of the dihydric phosphate and hydrophosphate, and dihydric phosphate of organic amine or a mixture of the dihydric phosphate and hydrophosphate, wherein pKais larger than 9.25. The concentration of ammonia nitrogen in wastewater can be reduced to 50 mg / L or 15 mg / L or even 5 mg / L or below in the process of using a gaseous membrane of the absorbent, theabsorbent is recycled through rectification regeneration, and meanwhile high-purity concentrated ammonia water is obtained to serve as a by-product. Compared with ammonium dihydrogen phosphate / diammonium hydrogen phosphate and other ammonium phosphate absorbents with the same renewable function, the absorbent provided by the invention is stable in deamination effect, easy to control and lower in corrosion to equipment. Compared with the traditional rectification or steam stripping deamination process, the ammonia nitrogen removal efficiency is higher, and the energy consumption is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and wastewater treatment methods, in particular to a novel absorbent in the application process of a gaseous membrane and its application method in the field of wastewater deamination. 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 ox...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/44C02F101/16
CPCC02F1/586C02F1/44C02F2101/16
Inventor 秦英杰崔东胜刘立强蔡腾豪
Owner TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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