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Method of eliminating magnesium sulfate from magnesium sulfate containing waste water solution

A magnesium sulfate and wastewater technology, which is applied in chemical instruments and methods, water pollutants, frozen water/sewage treatment, etc., can solve the problems of magnesium sulfate waste, secondary environmental pollution, etc., and achieves low operating cost, low impurity content, Environmentally friendly effects

Active Publication Date: 2007-08-15
BEFAR GROUP CO LTD
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Problems solved by technology

[0003] The desulfurization wastewater containing magnesium sulfate produced by the above desulfurization process is directly discharged outside after removing suspended solids. Therefore, the desulfurization wastewater will cause secondary pollution to the environment
Simultaneously, also caused the waste of valuable magnesium sulfate

Method used

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  • Method of eliminating magnesium sulfate from magnesium sulfate containing waste water solution
  • Method of eliminating magnesium sulfate from magnesium sulfate containing waste water solution
  • Method of eliminating magnesium sulfate from magnesium sulfate containing waste water solution

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Embodiment Construction

[0019] The present invention is further described below.

[0020] The microfiltration membrane materials used in the microfiltration membrane device are polypropylene (PP), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), carbon microporous tubes, metal microporous tubes and ceramics One of the microporous tubes.

[0021] The nanofiltration membrane material adopted in the nanofiltration membrane device is polysulfone (PS), composite film (TFM), cellulose acetate (CA), aromatic polyamide (PA), polyvinyl alcohol (PVA), sulfone One of polyethersulfone (SPES).

[0022] During nanofiltration, the temperature of the magnesium sulfate-containing wastewater solution is controlled between 40 and 50°C.

[0023] The nanofiltration membrane device in the present invention adopts membrane separation technology. Whether a membrane can separate a dissolved component from solution depends on the size, charge, shape of that component and its interaction with the membrane sur...

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Abstract

The invention discloses a removing method of magnesium sulfate from waste water solution with magnesium sulfate, which comprises the following steps: predisposing waste water solution with magnesium sulfate; transmitting the solution into micro-filter film device to remove micro-particle impurity; transmitting the solution into nano-filter film; obtaining percolation liquid with low-content magnesium sulfate and condensate with high-content of magnesium sulfate; freezing the condensate; extracting the solid of magnesium sulphate heptahydrate or adding calcium salt or barium salt to obtain calcium sulfate or barium sulfate; reacting magnesium salt and calcium hydroxide to produce magnesium hydroxide and calcium salt; saving the disposing cost; protecting environment; recycling magnesium sulfate.

Description

technical field [0001] The invention provides a method for treating wastewater, in particular a method for treating wastewater containing magnesium sulfate. Background technique [0002] In industrial production, a large amount of wastewater containing magnesium sulfate will be produced, such as the wastewater formed after magnesium desulfurization of flue gas in thermal power plants. Let's take this as an example to illustrate. Sulfur dioxide in coal-fired flue gas will pollute the environment. Therefore, the removal of sulfur dioxide (desulfurization), as an important factor affecting the operation of power plants, has been paid more and more attention. The magnesium oxide wet desulfurization process in the desulfurization process uses magnesium oxide as a desulfurization agent. This process system is simple and has good adaptability. Therefore, it has been widely used in recent years and has a tendency to gradually replace calcium-based desulfurization. In the magnesia ...

Claims

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Application Information

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IPC IPC(8): C02F1/22B01D61/14C02F101/10
Inventor 李德敏宋绍勇
Owner BEFAR GROUP CO LTD
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