Method for treating wet magnesium desulfuration wastewater

Abstract

The invention discloses a method for treating wet magnesium desulfuration wastewater, which comprises the processes of slurry cooling, anaerobic reaction, aerobic reaction and elemental sulfur reclamation. The method is characterized by comprising the following steps of: delivering the slurry in an absorption tower in a cooling circulation tank to reduce the temperature of the slurry, regulating the pH value of the slurry by adding alkali liquor, discharging the cooled desulfuration slurry into a biological anaerobic reaction tank, reducing magnesium sulfite and magnesium sulfate in the slurry into sulfide or hydrogen sulfide under the action of efficient sulfate reducing bacteria, pumping the wastewater into an aerobic reaction tower, and oxidizing the magnesium sulfide or the hydrogen sulfide into elemental sulfur under the action of sulfur bacteria; and discharging the wastewater containing the elemental sulfur into a sedimentation tank, separating sludge and suspension, and dryingthe solid to obtain the elemental sulfur. By the treatment method provided according to the characteristics of high sulfite / sulfide solution of the magnesium desulfuration wastewater, the wastewater can be effectively treated, and reclamation, harmlessness and high value of wastes are realized at the same time. The method is suitable for treating the magnesium desulfuration wastewater.

Description

technical field [0001] The invention relates to a treatment method suitable for desulfurization wastewater, in particular, a treatment method suitable for wet magnesium desulfurization wastewater. It is mainly used in the field of desulfurization and environmental protection. technical background [0002] The treatment methods of sulfur dioxide in coal-fired flue gas are mainly wet methods. There are two most widely used wet desulfurization methods, limestone (lime) desulfurization and magnesium oxide desulfurization. The common problems of wet desulfurization methods are in While removing sulfur dioxide in the flue gas, a large amount of waste water is also produced. At present, the two desulfurization methods have similar treatment methods for the generated waste water. After the calcium sulfate crystallizes, it is stacked and discarded; the waste water produced is discharged after traditional flocculation, precipitation, and pressure filtration. This method has a simple ...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a treatment method suitable for wet magnesium desulfurization wastewater, which not only solves the problem of desulfurization wastewater treatment and discharge, but also alleviates the problem of high sulfite / sulfate content in magnesium desulfurization wastewater. The status quo of scarcity of resources

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