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Method for treating ammonia nitrogen wastewater

A treatment method and technology for ammonia nitrogen wastewater are applied in the field of treatment of high-concentration ammonia nitrogen wastewater, which can solve problems such as tower blockage, scaling, and poor removal of suspended solids, and achieve the effects of avoiding scaling and tower blockage and reducing the cost of alkali addition.

Active Publication Date: 2008-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the problems existing in the prior art: poor removal of suspended solids, dissolved silicon-aluminum substances brought into the stripping process to cause fouling and tower blockage, high cost of stripping deamination and alkali addition, etc., the treatment method of the present invention is as follows Achieved:

Method used

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  • Method for treating ammonia nitrogen wastewater
  • Method for treating ammonia nitrogen wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Remove suspended solids and soluble silicon-aluminum substances.

[0052] A refinery catalyst production wastewater containing dissolved SiO 2 and Al 3+ and suspended matter, the main component of the suspended matter is SiO 2 and Al(OH) 3 , Al in wastewater 3+ The concentration is 323.4mg / L, SiO 2 The concentration is 124.4mg / L.

[0053] Add sodium hydroxide to the wastewater to make the pH value 6.0; then add flocculant polyacrylamide, the concentration of which is 10mg / L; after flocculation and precipitation, Al in the wastewater 3+ The concentration is 0.49mg / L, SiO 2 The concentration is 40.5mg / L.

Embodiment 2～14

[0055] Remove suspended solids and dissolved silicon-aluminum substances.

[0056] The type of alkali, adjusted pH, concentration of flocculant, and flocculation temperature were changed, and others were the same as in Example 1. The results of wastewater treatment are shown in Table 1.

[0057] Table 1

[0058]

Embodiment 15

[0060] Removal of acidic substances SO 4 2- .

[0061] A kind of oil refinery catalyst production wastewater, after removing suspended solids and soluble silicon-aluminum substances, the SO in wastewater 4 2- The concentration is 43200mg / L.

[0062] Adding calcium hydroxide to wastewater, the added Ca 2+ with SO 4 2- The molar ratio is 0.5:1, after precipitation, SO in wastewater 4 2- The concentration is 19150mg / L.

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Abstract

This invention relates to a method for treating ammonia nitrogen wastewater, especially high-concentration ammonia nitrogen wastewater produced during manufacture of oil-refinery catalyst. The method comprises: (1) adjusting the pH value of the wastewater, and solid-liquid separating to remove suspended matters and dissolved Si2+, Al3+ and their compounds; (2) adding Ca2+ to form CaSO4 precipitate, and solid-liquid separating to reduce acidic matters in the wastewater; (3) adding CO32- to form CaCO3 precipitate, and solid-liquid separating to remove Ca2+ in the wastewater; (4) steam-stripping for deamination, and performing biochemical treatment so that wastewater reaches state discharge standards. The method can solve the problems of low effect on removing suspended matters and dissolved Si2+, Al3+ and their compounds, scaling and column blockage during steam-stripping process, and the need for a large amount of alkali added, and can improve wastewater treatment effect.

Description

technical field [0001] The invention relates to a treatment method for industrial wastewater, in particular to a treatment method for high-concentration ammonia nitrogen wastewater. Background technique [0002] Ammonia nitrogen is a pollutant that has a serious impact on the water environment. Its main manifestations are: eutrophication of water body, promotion of algae reproduction, large consumption of dissolved oxygen in water, death of aquatic organisms, and water odor. All countries in the world strictly limit the concentration of ammonia nitrogen in wastewater. The discharge standard currently adopted in my country is the "Comprehensive Discharge Standard for Wastewater" (GB8978-1996). The standard ammonia nitrogen discharge concentration is less than or equal to 15mg / L, and the secondary standard ammonia nitrogen discharge concentration is less than or equal to 25mg / L. [0003] At present, there are many methods for treating ammonia nitrogen wastewater, mainly includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/60C02F9/02C02F1/52C02F1/20C02F3/02
CPCY02W10/10
Inventor 高明华侯秀华梁云赵璞
Owner CHINA PETROLEUM & CHEM CORP
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