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Desulfurization wastewater quality-divided crystallization processing method and processing device

A desulfurization wastewater and treatment method technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of large-scale salt crystallization treatment and affect the treatment effect, and reduce the scale , Saving processing costs and reducing usage

Pending Publication Date: 2019-07-05
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a treatment method and device for fractional crystallization of desulfurization wastewater, so as to solve the problem of heavy metal ions affecting the treatment effect in the process of fractional crystallization of desulfurization wastewater in the prior art, and large-scale salt crystallization treatment. question

Method used

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  • Desulfurization wastewater quality-divided crystallization processing method and processing device
  • Desulfurization wastewater quality-divided crystallization processing method and processing device
  • Desulfurization wastewater quality-divided crystallization processing method and processing device

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Pass the desulfurization waste water into the regulating tank, carry out homogenization treatment through the agitator, and then pass the desulfurization waste water after homogenization treatment into the reaction tank. Add soda ash and magnesium chloride to the reaction tank to adjust the pH of the desulfurization wastewater to 10, then pass the desulfurization wastewater into the sedimentation tank and add TMT-15 and iron ore particles, turn on the magnetic separation device for 8 minutes, and obtain sediment and supernatant. The sediment is transferred to the sedimentation tank, and the iron ore particles in it are separated by a cyclone for reuse. In addition, the hardness of the supernatant was measured to be 3ml / L, and hydrochloric acid was added to the supernatant to adjust the pH to 7, and then ultrafiltration was performed through an ultrafilter to filter out suspended solids and colloidal impurities therein to obtain a turbidity of 0.15NTU concentrated water...

Embodiment 2

[0074] Pass the desulfurization waste water into the regulating tank, carry out homogenization treatment through the agitator, and then pass the desulfurization waste water after homogenization treatment into the reaction tank. Add liquid caustic soda and lime to the reaction tank to adjust the pH of the desulfurization wastewater to 12, then pass the desulfurization wastewater into the sedimentation tank and add TMT-15 and iron ore particles, turn on the magnetic separation device for 8 minutes, and obtain precipitates and supernatant. The sediment is transferred to the sedimentation tank, and the iron ore particles in it are separated by a cyclone for reuse. In addition, the hardness of the supernatant was measured to be 4ml / L, and hydrochloric acid was added to the supernatant to adjust the pH to 6.5, and then ultrafiltration was performed through an ultrafilter to filter out suspended solids and colloidal impurities therein to obtain a turbidity of 0.15NTU concentrated wa...

Embodiment 3

[0076] Pass the desulfurization waste water into the regulating tank, carry out homogenization treatment through the agitator, and then pass the desulfurization waste water after homogenization treatment into the reaction tank. Add liquid caustic soda and lime to the reaction tank to adjust the pH of the desulfurization wastewater to 9, then pass the desulfurization wastewater into the sedimentation tank and add PAC, TMT-15 and iron ore particles, and turn on the magnetic separation device for 8 minutes to obtain Precipitate and supernatant. The sediment is transferred to the sedimentation tank, and the iron ore particles in it are separated by a cyclone for reuse. In addition, the hardness of the supernatant was measured to be 3.5ml / L, and hydrochloric acid was added to the supernatant to adjust the pH to 7.5, and then ultrafiltration was performed through an ultrafilter to filter out suspended solids and colloidal impurities therein to obtain a turbidity of 0.15 Concentrate...

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Abstract

The invention provides a desulfurization wastewater quality-divided crystallization processing method and a processing device. Desulfurization wastewater contains sodium chloride and sodium sulfate. The method comprises following steps: adjusting the pH of desulfurization wastewater to 9-12 for the first time, adding an organic sulfur agent and iron ore particles into adjusted desulfurization wastewater, carrying out magnetic separation to obtain precipitates and supernate; adjusting the pH of the supernate to 6.5-7.5 for a second time, carrying out ultrafiltration to obtain concentrated water; subjecting the concentrated water to a reverse osmosis treatment to obtain a reverse osmosis concentrated solution; subjecting the reverse osmosis concentrated solution to a nano filtration treatment to obtain nano filtration producing water and nano filtration concentrated water; subjecting the nano filtration producing water to a concentration treatment and a crystallization treatment in sequence to obtain sodium chloride crystals; and subjecting the nano filtration concentrated water to a concentration treatment and a crystallization treatment in sequence to obtain sodium sulfate decahydrate crystals. Solved are the problems that in conventional desulfurization wastewater quality-divided crystallization processing, the effect is influenced by heavy metal ions, and the salt crystallization amount is large.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment method and a treatment device for fractional crystallization of desulfurization waste water. Background technique [0002] Limestone-gypsum wet flue gas desulfurization process is the most widely used high-efficiency desulfurization technology in the world, and it is also the mainstream process of flue gas desulfurization in my country. The main principle of this process is to use alkaline slurry to absorb SO in the flue gas 2 , to generate by-products such as gypsum, but a large amount of desulfurization wastewater will be produced during the desulfurization process, and the desulfurization wastewater contains suspended solids, supersaturated sulfite, sulfate, and heavy metals, so the treatment of desulfurization wastewater is difficult, and some of them Impurities belong to the first category of pollutants required to be controlled in the national environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C01D3/04C01D3/14C01D3/22C01D5/00C01D5/16C02F103/18C02F101/20
CPCC02F9/00C01D5/004C01D5/16C01D3/04C01D3/22C01D3/14C02F1/66C02F1/441C02F1/444C02F1/442C02F1/5245C02F1/488C02F1/22C02F2103/18C02F2101/20C01P2006/80C01P2006/82
Inventor 何文丽赵金赵永志聂宜文徐腾飞田丽森
Owner CHINA ENFI ENGINEERING CORPORATION
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