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Nanofiltration treatment method of desulfurization waste water

A technology for desulfurization wastewater and treatment methods, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve environmental and human health hazards, increase energy consumption of public works, crystallizer Large load and other problems, to achieve the effect of reducing operating costs, low cost and easy operation

Active Publication Date: 2016-01-13
BEIJING WOTEER WATER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This common three-box technology, that is, the traditional coagulation and clarification comprehensive treatment technology, can only achieve simple pretreatment. In order to realize the crystallization treatment of salt in desulfurization wastewater, the load of the follow-up crystallizer is very large, so invisible. The energy consumption of various public works such as steam, electricity, and circulating water in the power plant is increased, and a large amount of chemical agents are used, which is harmful to the environment and human health.
In addition, desulfurization wastewater will also contain a variety of recyclable inorganic salts and other substances. Direct treatment and discharge not only cause waste of resources, but also need to find another discharge point, which increases operating costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Pretreatment: The raw water is the desulfurization wastewater discharged by FGD and the clean salt water after treatment is 18m 3 / h and condensate fine treatment mixed bed and chemical replenishment mixed bed regeneration discharge 4m of brine 3 / h, use the raw water pump to transport to the neutralization tank, slowly pour in sodium hydroxide solid, the pH meter shows that the pH is between 8.5-9.5, then stop the operation, and then use the pump to transport to the clarification tank, in the clarification tank Dosing sodium carbonate and TMT-15 agent to remove calcium ions and heavy metal elements, so that Ca in water 2+ CaCO 3 Settling, and then the product water from the clarifier enters the multi-media filter to remove most of the suspended matter, thus completing the water softening operation. The whole water softening system is in accordance with 26.4m 3 / h configuration, while the normal design water intake is 22m 3 / h, so the system configuration meets t...

Embodiment 2

[0030] 1) Pretreatment: The raw water is the desulfurization wastewater discharged by FGD and the clean salt water after treatment is 18m 3 / h and condensate fine treatment mixed bed and chemical replenishment mixed bed regeneration discharge 4m of brine 3 / h, use the raw water pump to transport to the neutralization tank, slowly add sodium hydroxide solution, and stir while adding, the stirring rate is controlled at 100rad / min, and the pH meter shows that the pH is between 9-9.3. The operation can be stopped, and then pumped to the clarification tank, and sodium carbonate and TMT-15 agents are added to the clarification tank to remove calcium ions and heavy metal elements, so that the Ca in the water 2+ CaCO 3 Precipitation, and then the product water from the clarification tank enters the multimedia filter and sand filter device to remove most of the suspended matter in the water, thus completing the water softening operation. The whole water softening system is in accorda...

Embodiment 3

[0034] 1) Pretreatment: The raw water is the desulfurization wastewater discharged by FGD and the clean salt water after treatment is 18m 3 / h and condensate fine treatment mixed bed and chemical replenishment mixed bed regeneration discharge 4m of brine 3 / h, use the raw water pump to transport to the neutralization tank, slowly add sodium hydroxide solution, and stir while adding, the stirring rate is controlled at 50rad / min, and the pH meter shows that the pH is 9.2, and the operation can be stopped , and then transported to the clarification tank with a pump, and sodium carbonate and TMT-15 are added to the clarification tank to remove calcium ions and heavy metal elements, so that the Ca in the water 2+ CaCO 3 Precipitation, and then the product water from the clarification tank enters the ultrafiltration device and the sand filter device to remove most of the suspended matter in the water, thus completing the water softening operation. The whole water softening system ...

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Abstract

The invention provides a nanofiltration treatment method of desulfurization waste water. The method comprises the following steps that 1, pH of the desulfurization waste water is adjusted to range from 8.5 to 9.5, and TMT-15 and sodium carbonate are added to remove calcium ions and heavy metal elements; 2, the desulfurization waste water treated in the first step is filtered, and nanofiltration treatment is conducted on the filtered desulfurization waste water to obtain separation liquor and concentrated liquor; 3, crystallization treatment is conducted on the separation liquor to obtain NaCl solid salt, the concentrated liquor is treated according to the second step, nanofiltration treatment is repeatedly conducted on the concentrated liquor to make the recovery rate of NaCl in the desulfurization waste water treated in the first step reach above 80%, and MgSO4 solid salt is obtained through crystallization treatment. According to the nanofiltration treatment method of the desulfurization waste water, the treatment method is simple, the cost is low, operation is easy, the operation conditions are mild, the operation method is flexible, and recycling of various inorganic salt in the desulfurization waste water is achieved.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a nanofiltration treatment method for desulfurization wastewater. Background technique [0002] To say what is the dirtiest water in the power plant, it is desulfurization wastewater. The desulfurization wastewater itself is weakly acidic and contains a high content of calcium and magnesium ions. In the prior art, the treatment method for desulfurization wastewater is mainly separated by chemical-mechanical sedimentation. Heavy metals and other precipitates (such as fluoride, sulfite, sulfate, etc.). At present, the typical domestic wastewater treatment processes are derived based on the discharge characteristics of desulfurization wastewater. Therefore, the traditional desulfurization wastewater treatment process generally consists of three major parts: wastewater treatment system, sludge dewatering system, and chemical dosing system. Among them, the wastewater tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F5/40C01D3/04
Inventor 刘玲玲李向杰潘学杰王大新张承慈
Owner BEIJING WOTEER WATER TECH
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