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A kind of antiscaling agent and application thereof for treating waste water by supercritical water oxidation technology

A supercritical water oxidation and technical treatment technology, applied in the directions of oxidized water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc. Equipment oxidation efficiency and other issues to achieve the effect of reducing fouling, reducing deposition, and promoting oxidation efficiency

Active Publication Date: 2020-10-09
SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are great difficulties in the practical application of this technology. One of the most important reasons is that under supercritical conditions, the solubility of inorganic salts decreases sharply, especially calcium, magnesium, copper, zinc and other water hardness elements will form dirt, which is very difficult. It is easy to cause blockage of the pipeline of the treatment device and reduce the oxidation efficiency of the equipment
In industrial applications in other fields, it is a practical and effective method to prevent and eliminate fouling by adding scale inhibitors, but the existing scale inhibitors are not suitable for supercritical conditions, and there is no specific The scale inhibitor used in supercritical water oxidation technology, the present invention emerges at the historic moment from the problems existing in the application of supercritical water oxidation treatment technology, and can effectively solve the above problems

Method used

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  • A kind of antiscaling agent and application thereof for treating waste water by supercritical water oxidation technology
  • A kind of antiscaling agent and application thereof for treating waste water by supercritical water oxidation technology
  • A kind of antiscaling agent and application thereof for treating waste water by supercritical water oxidation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The total hardness is 500mg / L (calculated as calcium, 12.5mol / t), the raw water alkalinity is 0.01mol / t, after configuration, it needs to be maintained at 0.05mol / t, and the wastewater COD concentration is 20000mg / L. Therefore, every ton of wastewater treated requires Add 5% by mass of sodium carbonate and sodium nitrite (mass ratio 10:0.2) 13.292 kg of scale inhibitor solution, the concentration of salicylic acid in the scale inhibitor solution is 2%;

[0029] Using the supercritical pilot plant to treat the waste water described in Application Case 1, under the same experimental conditions, experiments with and without scale inhibitors were carried out. The experimental data are shown in Table 1.

[0030] Table 1: Comparison of the effects of adding antiscalants in supercritical experiments (running at 25MPa; sodium carbonate, sodium nitrite (10:0.2), salicylic acid (2% concentration))

[0031]

[0032]

Embodiment 2

[0034] The total hardness is 3000mg / L (calculated as calcium, 75mol / t), the raw water alkalinity is 0.02mol / t, and it needs to be maintained at 0.05mol / t after configuration; the wastewater COD concentration is 100000mg / L in wastewater, so it is necessary to treat each ton of wastewater Add 10% by mass of sodium carbonate and sodium nitrite (mass ratio 10:1) 39.766kg of scale inhibitor solution, 5-nitro-2-hydroxybenzoic acid and sodium acetate (mass ratio 1:1) in the scale inhibitor solution 1) the concentration is 9%;

[0035] Using the supercritical pilot plant to treat the waste water described in Application Case 2, under the same experimental conditions, experiments with and without scale inhibitors were carried out. The experimental data are shown in Table 2.

[0036] Table 2: Comparison of the effects of adding antiscalants in supercritical experiments (running at 25MPa; sodium carbonate, sodium nitrite (10:1), 5-nitro-2-hydroxybenzoic acid and sodium acetate (9% concen...

Embodiment 3

[0039] The total hardness is 800mg / L (calculated as magnesium, 33.33mol / t), the raw water alkalinity is 0.0mol / t, and it needs to be maintained at 0.05mol / t after configuration; the wastewater COD concentration of wastewater is 80000mg / L, and the mass of wastewater added per ton The antiscalant solution of sodium carbonate and sodium nitrite (mass ratio 10:0.5) 29.489kg of percentage 6%, dinitrosalicylic acid, pyruvic acid and sodium edetate (three Mass ratio 1:1:0.5) concentration is 8%.

[0040] Using the supercritical pilot plant to treat the waste water described in Application Case 3, under the same experimental conditions, the experiments with and without scale inhibitors were carried out. The experimental data are shown in Table 3.

[0041] Table 3: Comparison of the effects of adding scale inhibitors to supercritical experiments (operating under the condition of 25MPa; sodium carbonate, sodium nitrite (10:0.5), dinitrosalicylic acid, pyruvic acid and sodium edetate (8%...

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Abstract

The invention discloses an antisludging agent used for disposing sewage with the supercritical water oxidation technology. The antisludging agent is composed of an inorganic component and an organic component, the inorganic component is a mixture of sodium carbonate and sodium nitrite with the mass ratio of 10:0.2-1, and the organic component is a mixture of one or several of salicylic acid, dinitrosalicylic acid, 5-nitro-2-hydroxybenzoic acid, sodium acetate, pyruvic acid and sodium ethylene diamine tetracetate. The invention further discloses an application of the antisludging agent. The antisludging agent is applicable to sewage disposal with the supercritical water oxidation technology, hardness in water can be removed, mixed dissolving of insoluble organic matters in the water and the water is promoted, deflagration can be formed in the supercritical condition to promote oxidative combustion, heat release of the sewage in supercritical water oxidation is sustained or improved, efficient and continuously stable running of supercritical water oxidation equipment is guaranteed, and the sewage is disposed thoroughly.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a scale inhibitor for supercritical water oxidation treatment of wastewater. Background technique [0002] Supercritical water oxidation technology is a high temperature and high pressure technology, using water under supercritical conditions (Pc=220.55bar, T C =373.976°C), through the oxidant, it will undergo violent oxidation or even combustion reaction with organic matter, including O 2 Gases such as gas and organic substances are completely dissolved in supercritical water, so almost all organic substances can be oxidized into harmless small molecular compounds under its conditions, which is a very efficient wastewater treatment technology. However, there are great difficulties in the practical application of this technology. One of the most important reasons is that under supercritical conditions, the solubility of inorganic salts decreases sharply, especially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12C02F1/72
CPCC02F1/727C02F5/125
Inventor 陈善平邰俊欧阳创张瑞娜戴迎春许碧君申哲民
Owner SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD
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