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Method for synergetically treating organic waste liquid and heavy-metal waste liquid by supercritical water

A technology of organic waste liquid and synergistic treatment, applied in chemical instruments and methods, heating water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of reducing the concentration of pollutants, and achieve the effect of efficient and rapid treatment and cost reduction

Inactive Publication Date: 2017-04-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to utilize the oxidizing ability of heavy metal ions in heavy metal waste liquid and the problem that oxidants are needed for organic waste liquid treatment to provide an efficient and simple method for co-processing organic waste liquid and heavy metal waste liquid with supercritical water. The treatment of organic waste liquid in the critical water medium does not require oxygen as an oxidant, while the treatment of heavy metal waste liquid does not require the power consumption of electrolysis to achieve the reduction and recovery of heavy metal ions, the concentration of pollutants in the treated wastewater is greatly reduced, and heavy metals are recovered at the same time resource

Method used

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  • Method for synergetically treating organic waste liquid and heavy-metal waste liquid by supercritical water
  • Method for synergetically treating organic waste liquid and heavy-metal waste liquid by supercritical water

Examples

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Embodiment 1

[0015] Embodiment 1: first, the depolymerized residue of corn stalk after 0.1g drying (element mass percent is carbon 45%, oxygen 48%, hydrogen 6%, nitrogen and sulfur add up to 1%) add reactor, then add 1mL concentration 2.5 mol / L containing Ni(NO 3 ) 2 Heavy metal waste liquid, make the material and heavy metal waste liquid mix evenly, and finally seal. Before heating, argon gas was passed into the reactor twice and then evacuated to remove the air inside. Afterwards, the reactor was heated from room temperature to 650°C at a heating rate of about 30°C / min. The reaction was maintained at 650±5°C and 22.5-26MPa for 30min. After the reaction, it was cooled to 300° C. at room temperature, and then water-cooled to normal temperature. Collect the gas for component analysis, then measure the flow rate with a gas flow meter, then open the reactor, separate the liquid and solid, and weigh them separately for analysis. Experimental results show that the gasification rate of corn...

Embodiment 2

[0016] Example 2: Add 0.1 g of dried corn stalk depolymerization residue (element mass percentage is carbon 45%, oxygen 48%, hydrogen 6%, nitrogen and sulfur total 1%) to the reactor, and then add 1 mL concentration of 2.5 moles / L containing Cu(NO 3 ) 2 Heavy metal waste liquid, make the material and heavy metal waste liquid mix evenly, and finally seal. Before heating, argon gas was passed into the reactor twice and then evacuated to remove the air inside. Afterwards, the reactor was heated from room temperature to 650°C at a heating rate of about 30°C / min. The reaction was maintained at 650±5°C and 22.5-26MPa for 30min. After the reaction, it was cooled to 300° C. at room temperature, and then water-cooled to normal temperature. Collect the gas for component analysis, then measure the flow rate with a gas flow meter, then open the reactor, separate the liquid and solid, and weigh them separately for analysis. Experimental results show that the gasification rate of corn...

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Abstract

The invention discloses a method for synergetically treating organic waste liquid and heavy-metal waste liquid by supercritical water. The method comprises the following steps of adding the organic waste liquid and the heavy-metal waste liquid into a reaction kettle, raising the temperature of the reaction kettle to 400 to 700 DEG C, increasing the pressure of the reaction kettle to 20MPa to 30MPa, making the waste liquid reach supercritical states, and completing a reaction in the reaction kettle, wherein finally organic matters in the organic waste liquid are mineralized to be carbon dioxide, water and other inorganic components, and heavy metal ions in the heavy-metal waste liquid are reduced to be low-valence-state ions or simple substances. The method for treating the waste liquid has the characteristics of being low in cost, being high-efficiency, being liable to industrially operate, and the like, and has potential application value.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment and applied chemistry, and in particular relates to a method for co-processing organic waste liquid and heavy metal waste liquid with supercritical water. Background technique [0002] Supercritical water oxidation technology is a technology that uses supercritical water as a medium to carry out deep oxidation treatment of organic waste. This technology oxidizes organic waste into carbon dioxide, water, nitrogen and other small molecules by introducing oxygen into the supercritical water medium as an oxidant. It has the advantages of high efficiency and thorough treatment of organic waste and has been valued by scholars in the field of environmental protection. However, the traditional supercritical water oxidation technology often needs to be filled with a large amount of oxygen to achieve the complete oxidation of organic matter. [0003] Metallurgy, electroplating, minin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/02C02F1/72C02F101/20C02F101/30
CPCC02F1/02C02F1/72C02F2101/20C02F2101/30C02F2301/066
Inventor 陈庆云杨景王晨阳王云海
Owner XI AN JIAOTONG UNIV
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