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Treatment and recycling method of ammonia nitrogen containing high-salt catalyst wastewater

A catalyst and wastewater technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc. Achieving a high degree of recycling

Active Publication Date: 2013-08-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a method for advanced treatment and reuse of ammonia-nitrogen-containing high-salt catalyst wastewater by using membrane separation technology. There is a high-salt and ammonia-nitrogen discharge of ammonia-nitrogen-containing high-salt catalyst wastewater that is not up to standard, and water resources are recycled

Method used

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  • Treatment and recycling method of ammonia nitrogen containing high-salt catalyst wastewater

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Effect test

Embodiment 1

[0041] A chemical plant contains ammonia nitrogen and high-salt catalyst wastewater. The main water quality characteristics of the wastewater are: wastewater pH 8.19, conductivity 17.6mS / cm, COD cr 61mg / L, SS 33mg / L, H 2 PO 4 - 116.1mg / L, Cu 5.3mg / L, Zn 2.12mg / L, Na + 3448.1mg / L, Ca 2+ 7.8mg / L, NO 3 - 12105.7mg / L, Cl - 12.7mg / L, NH 4 -N 397.2mg / L. The processing flow is attached figure 1 shown.

[0042] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.19 to about 5, so that most of the ammonia nitrogen in the wastewater is NH + Existence (at 25°C and pH 5, the free ammonia in the liquid phase accounts for 0.0056% of the total ammonia).

[0043] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 5, wastewater temperature abou...

Embodiment 2

[0048] The main water quality characteristics of ammonia nitrogen-containing high-salt catalyst wastewater are the same as in Example 1.

[0049] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.19 to about 6, so that most of the ammonia nitrogen in the wastewater is NH + Existence (at 25°C, at pH 6, free ammonia in the liquid phase accounts for 0.0555% of the total ammonia).

[0050] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 6, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 60-100L / m 2 h, the turbidity of the product water is lower than 0.2NTU;

[0051] Step 3: Heat the microfiltration product water to a specific temper...

Embodiment 3

[0055] A chemical plant contains ammonia nitrogen and high-salt catalyst wastewater. The main water quality characteristics of the wastewater are: wastewater pH 8.24, conductivity 20.9mS / cm, COD cr 12mg / L, SS 940mg / L, Cu 185mg / L, Zn 45.6mg / L, NO 3 - 12122.6mg / L, PO 4 3- (as P) 0.3mg / L, NH 4 -N 252mg / L. The processing flow is attached figure 1 shown.

[0056] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.24 to about 5.5, so that most of the ammonia nitrogen in the wastewater is NH + exist.

[0057] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 5.5, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 50-80L / m 2 h, the t...

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Abstract

The invention relates to a recycling method for treating ammonia nitrogen containing high-salt catalyst wastewater by adopting a membrane separation technology. The process flow of 'acid regulation, micro-filtration, membrane distillation, cooling and crystallization' is adopted in the method. By adopting the process flow, salts, ammonia nitrogen and metal ions in the wastewater can be effectively removed, and deep treatment and recycle of the ammonia nitrogen containing high-salt catalyst wastewater are realized. The process flow makes full use of the technical advantages of membrane distillation, solves the problem that the discharge of high salts, ammonia nitrogen and metal ions of the ammonia nitrogen containing high-salt catalyst wastewater does not reach the standards, and realizes recycle of the produced water. After the ammonia nitrogen containing high-salt catalyst wastewater is treated by the process flow, the reclamation rate of the wastewater is more than 90 percent, and high recycle of the ammonia nitrogen containing high-salt catalyst wastewater is realized; and the method accords with the development strategies of energy conservation and emission reduction, and has remarkable social benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for advanced treatment and reuse of ammonia-nitrogen-containing high-salt catalyst wastewater by using membrane separation technology, and belongs to the field of industrial wastewater 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 causes water eutrophication and environmental pollution. It can easily cause algae and other microorganisms to multiply in water. Increase the amount of chlorine used in the process of water supply disinfection and industrial circulating water sterilization; in addition, ammonia nitrogen is corrosive to some metals (copper), and when sewage is reused, ammonia nitrogen in reclaimed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/66C02F1/44C02F101/16
Inventor 张新妙杨永强李井峰王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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