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A Homogeneous Ion Exchange Membrane Electrodialysis Advanced Treatment Process for Fly Ash Leach Solution

A homogeneous ion exchange and advanced treatment technology, which is applied in the field of homogeneous ion exchange membrane electrodialysis advanced treatment process of stabilized waste incineration fly ash solution, can solve the problems of different treatment costs and different pretreatment requirements, and achieve reduction Effects of pretreatment requirements, pollution avoidance, and treatment cost savings

Active Publication Date: 2020-01-24
XIAMEN KENING WOTE WATER TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since various technologies have different requirements for calcium content (calcium tolerance) in the influent solution, the corresponding pretreatment requirements are also different, which will eventually lead to differences in the overall treatment cost of the overall process plan

Method used

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  • A Homogeneous Ion Exchange Membrane Electrodialysis Advanced Treatment Process for Fly Ash Leach Solution
  • A Homogeneous Ion Exchange Membrane Electrodialysis Advanced Treatment Process for Fly Ash Leach Solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 1 As shown, a kind of stabilized garbage incineration fly ash drenching solution homogeneous ion exchange membrane electrodialysis advanced treatment process proposed by the present invention comprises the following steps:

[0030] (1) The conductivity of the stabilized waste incineration fly ash leaching solution is 70mS / cm, and it is pumped into the chemical dosing and decalcification system. By adding Na 2 CO 3 agent and stirred to remove part of Ca 2+ , to obtain a fly ash solution with a hardness of 1500ppm. Play the role of softening pretreatment, get CaCO 3 The precipitated (mud) and softened fly ash leaching solution and mud can be recycled or returned to landfill for landfill.

[0031] (2) The softened fly ash leaching solution with a hardness of 1500 ppm obtained in step (1) is further clarified by immersion ultrafiltration to obtain a clarified softened fly ash leaching solution. In this embodiment, the submerged ultrafiltration adopts c...

Embodiment 2

[0039] refer to figure 1 As shown, a kind of stabilized garbage incineration fly ash drenching solution homogeneous ion exchange membrane electrodialysis advanced treatment process proposed by the present invention comprises the following steps:

[0040] (1) The stabilized waste incineration fly ash solution with a conductivity of 80.4mS / cm is pumped to the dosing and decalcification system. By adding Na 2 CO 3 agent and stirred to remove part of Ca 2+ , to obtain a fly ash leaching solution with a hardness of 1600 ppm. Play the role of softening pretreatment, get CaCO 3 The precipitated (mud) and softened fly ash leaching solution and mud can be recycled or returned to landfill for landfill.

[0041] (2) The softened fly ash leaching solution with a hardness of 1600 ppm obtained in step (1) is further clarified by immersion ultrafiltration to obtain a clarified softened fly ash leaching solution. In this embodiment, the submerged ultrafiltration adopts curtain hollow fi...

Embodiment 3

[0049] refer to figure 1 As shown, a kind of stabilized garbage incineration fly ash drenching solution homogeneous ion exchange membrane electrodialysis advanced treatment process proposed by the present invention comprises the following steps:

[0050] (1) The stabilized waste incineration fly ash leaching solution TDS=75mS / cm is pumped to the dosing and decalcification system. By adding Na 2 CO 3 agent and stirred to remove part of Ca 2+ , to obtain a fly ash leaching solution with a hardness of 1870 ppm. Play the role of softening pretreatment, get CaCO 3 The precipitated (mud) and softened fly ash leaching solution and mud can be recycled or returned to landfill for landfill.

[0051] (2) The softened fly ash leaching solution with a hardness of 1870 ppm obtained in step (1) is further clarified by immersion ultrafiltration to obtain a clarified softened fly ash leaching solution. In this embodiment, the submerged ultrafiltration adopts curtain hollow fiber membrane...

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Abstract

The invention belongs to the field of water treatment, and particularly relates to a homogeneous phase ion exchange membrane electrodialysis deep treatment process for stabilizing the fly ash leachateof waste incineration, which returns produced nanofiltered concentrated water and reverse osmosis concentrated water into electrodialysis fresh water to undergo cyclic desalination by means of a dosing and calcium removal system, an immersed ultrafiltration system, PH regulation, an electrodialysis system, a nanofiltration system and a reverse osmosis system, so that the overall recovery rate ofthe system is increased. By choosing a homogeneous phase ion exchange membrane with high calcium tolerance and an electrodialysis device thereof, the invention decreases the requirement of fly ash leachate pretreatment, thus greatly reducing the treatment cost. By adopting the electrodialysis technique and reasonably designing a feed liquid amount ratio, feed liquid flow velocity and average current density, the invention realizes the high concentration and great reduction of high-hardness fly ash leachate, preventing leachate from overflowing to cause the risk of surrounding environment pollution.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a homogeneous ion-exchange membrane electrodialysis advanced treatment process for a stabilized garbage incineration fly ash leaching solution. Background technique [0002] Fly ash refers to solid waste collected in processes such as flue gas cleaning systems, chimney bottoms, and heat recovery systems in waste incineration plants. [0003] In order to control the leaching of heavy metals in fly ash, reduce the toxicity of fly ash and the harm to the environment, fly ash must undergo intermediate treatment processes such as stabilization or solidification before it can be finally landfilled or recycled. The curing / stabilization process needs to add chemical stabilizers, cement, fly ash, sodium silicate, lime and other chemical additives to stabilize and then solidify. This method has limited ability to stabilize heavy metals, and there is a possibility of long-term rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/469B01D61/48
CPCB01D61/485C02F1/441C02F1/442C02F1/444C02F1/4693C02F1/66C02F5/06C02F9/00C02F2209/055Y02A20/124Y02A20/131
Inventor 纪镁铃
Owner XIAMEN KENING WOTE WATER TREATMENT TECH