Multifunctional supercritical water enhanced oxidation system for degradation-resistant nitrogen-containing and high-salt organic pollutants

A technology of supercritical water oxidation and organic pollutants, applied in water pollutants, water/sewage treatment, oxidized water/sewage treatment, etc. Reduce investment and avoid the effect of increased aggregation

Inactive Publication Date: 2020-10-13
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a multifunctional supercritical water enhanced oxidation system and method for refractory nitrogen-containing and high-salt organic pollutants, which can effectively solve the problem of supercritical water oxidation technology. When dealing with nitrogen-containing organic pollutants, the difficult-to-degrade intermediate product ammonia nitrogen is difficult to completely remove with COD under relatively mild reaction conditions, so as to realize the one-time standard discharge of COD and ammonia nitrogen after nitrogen-containing organic pollutants are treated

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  • Multifunctional supercritical water enhanced oxidation system for degradation-resistant nitrogen-containing and high-salt organic pollutants

Examples

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Embodiment 1

[0060] This example takes supercritical water oxidation technology to treat typical nitrogen-containing organic compound pyridine as an example, and explains in detail the multifunctional supercritical water enhanced oxidation system:

[0061] 1) Add appropriate tap water to the material blending tank to prepare the reactant pyridine according to the required concentration, and turn on the agitator to stir evenly, and then pressurize it to about 25MPa through the material high-pressure pump. The material first enters the outer tube of the preheater for preheating in the first stage. Since the temperature of the material in the supercritical water oxidation reactor is not enough to preheat the material to the required reaction temperature at one time in the initial stage of the reaction, it needs to be heated again. The high-pressure material is preheated in the second stage by the material heater (preheated to about 400°C). After the material is preheated and boosted, it enters...

Embodiment 2

[0067] The difference from Example 1 is that in step 1), when the material solution to be treated contains inorganic salt ions, the material is prepared by adding appropriate tap water in the material preparation tank according to the required concentration and mixed evenly, and then passes through the material solution. The high-pressure pump pressurizes it to about 25MPa, and then the high-pressure cold material directly enters the material channel at the end cover of the supercritical water oxidation reactor, and is sprayed onto the initial reaction plane through the atomization of the spiral atomizing nozzle, and opens at the same time The heater on the upper part of the supercritical water oxidation reactor directly heats the material in the reactor to the reaction temperature.

[0068] In step 4), according to the concentration of the required alcohol fuel (methanol, ethanol, ethylene glycol, isopropanol), add appropriate tap water in the medicament preparation tank for d...

Embodiment 3

[0071] The difference from Example 1 is that in step 2), the valve V101 is closed and the valve V102 is opened. After the hydrogen peroxide in the hydrogen peroxide storage tank is pressurized to about 25MPa by a high-pressure pump, it is determined whether it is necessary to pass Use a hydrogen peroxide heater to preheat it, and then determine whether it is necessary to inject oxygen into the reactor in sections, and the remaining steps are the same as in Example 1.

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Abstract

The invention relates to a multifunctional supercritical water enhanced oxidation system for degradation-resistant nitrogen-containing and high-salt organic pollutants. The multifunctional supercritical water enhanced oxidation system comprises an oxidant pretreatment unit, a material pretreatment unit, a medicament pretreatment unit, a supercritical water oxidation unit, a water supply unit and aproduct subsequent treatment unit. In the supercritical water oxidation system, a plurality of enhanced oxidation technologies such as reactor inner wall surface catalysis, heterogeneous metal oxidecatalysis, co-oxidation of auxiliary aids, sectional oxidation, sectional co-oxidation and catalytic oxidation of inorganic salt are coupled at one time, one or a combination of more than one of the enhanced technologies can realize synergistic and efficient removal of COD and ammonia nitrogen from the nitrogen-containing organic pollutants under relatively mild reaction conditions, so that the operating conditions of the system and the investment cost of equipment are reduced, and the economy, safety and reliability of the system are improved. And meanwhile, the phenomena of salt crystallization, deposition and blockage of equipment such as a preheater and a heater and connecting pipelines thereof in the preheating process are avoided, and the running reliability of the system is improved.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and in particular relates to a multifunctional supercritical water enhanced oxidation system and method for refractory nitrogen-containing and high-salt organic pollutants. Background technique [0002] The rapid economic development has brought severe environmental pollution problems. The annual discharge of high-concentration refractory organic wastewater and sludge continues to grow. In 2016, the discharge of industrial wastewater exceeded 20 billion tons, and the discharge of municipal sludge exceeded 4,000 10,000 tons, seriously affecting the safety of the ecological environment and human health. It is worth noting that waste water produced by chemical, petrochemical, pharmaceutical, petroleum, printing and dyeing industries contains a large amount of nitrogen-containing organic matter, such as sulfonamides and quinolone antibiotics in pharmaceutical w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/16C02F101/30
CPCC02F1/725C02F2101/16C02F2101/30
Inventor 王树众李建娜蒋卓航李艳辉杨健乔
Owner XI AN JIAOTONG UNIV
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