Synergic treatment method of heavy metals in hazardous waste incineration plant wastewater and fly ash

A hazardous waste and co-processing technology, applied in chemical instruments and methods, solid waste removal, water/sewage multi-stage treatment, etc. Significant energy-saving effect, reduced leaching toxicity, and reduced leachate concentration

Inactive Publication Date: 2015-12-30
ZHEJIANG UNIV OF TECH
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Problems solved by technology

These methods generally have the disadvantages of high energy consumption, the need to consume

Method used

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  • Synergic treatment method of heavy metals in hazardous waste incineration plant wastewater and fly ash
  • Synergic treatment method of heavy metals in hazardous waste incineration plant wastewater and fly ash
  • Synergic treatment method of heavy metals in hazardous waste incineration plant wastewater and fly ash

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[0022] Refer to the attached drawings,

[0023] Step 1: Take 20kg of fly ash from a hazardous waste incineration plant, 4kg of coal-fired power plant fly ash, and 200L of hazardous waste incineration plant waste water to mix; add 0.8kg NaOH to the mixture to adjust the pH of the mixture, and test to ensure that the solution is alkaline (PH > 12); Check that the discharge port of the reactor is closed, and pour the mixture into a 500L hydrothermal reactor;

[0024] Step 2: Close the mixed liquid injection port of the hydrothermal reactor, turn on the automatic stirrer (100r / min), connect the flue waste heat steam generator, slowly open the steam inlet valve, and use the waste heat steam to gradually increase the pressure inside the reactor; Observe the temperature and pressure gauges of the reactor to ensure safe operation;

[0025] Step 3: After the temperature reaches 250°C (about 4.0MPa), adjust the steam flow to keep the temperature of the reactor at 250°C (±5°C) for 2.0h;

[0026...

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Abstract

The invention relates to a synergic treatment method of heavy metals in hazardous waste incineration plant wastewater and fly ash, which is used for treating high-concentration heavy metals in hazardous waste incineration plant fly ash and wastewater. In the treatment environment of hydrothermal conditions, a certain amount of alkaline and exogenous silicon aluminum additive (incineration power plant fly ash) is added, and hydrothermal reaction is performed, so that the heavy metals in the wastewater are transferred from the liquid phase into the solid phase, thereby removing the heavy metals; and the fly ash has high adsorption capacity for most heavy metals, and especially after the hydrothermal modification, the adsorption capacity of the fly ash for heavy metals is further enhanced. After the hydrothermal reaction, the heavy metals are not simply enriched on the fly ash surface, but coated in the zeolite crystals, and exists in a stable form which is difficult for ion exchange and desorption, thereby stabilizing the heavy metals in the fly ash; and thus, the heavy metal percolation concentration is greatly lowered, and is lower than the relevant standard value, thereby satisfying the requirements for comprehensive utilization and landfill treatment.

Description

technical field [0001] The invention relates to a co-processing method for removing heavy metals in waste water and stabilizing heavy metals in fly ash. Background technique [0002] With the rapid and continuous growth of China's national economy and the diversification of lifestyles, the production and accumulation of domestic garbage and industrial solid waste in my country are also increasing year by year. In 2013, the amount of industrial hazardous waste produced in my country was 31.569 million tons. With the improvement of residents' requirements for environmental quality and the promulgation and implementation of the "National Planning for the Construction of Hazardous Waste and Medical Waste Disposal Facilities", my country's hazardous waste disposal has gradually embarked on the road of standardization. Incineration technology has been widely used because of its ability to quickly reduce volume, volume and harm, and realize thermal energy recovery. According to t...

Claims

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Application Information

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IPC IPC(8): C02F9/04B09B3/00B09B5/00
Inventor 严密方祝敏江志强何磊林杰金剑徐璋
Owner ZHEJIANG UNIV OF TECH
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