Process for removing elemental sulfur in desulfurization and denitration acid-making wastewater

Abstract

The invention discloses a process for removing elemental sulfur in desulfurization and denitration acid-making wastewater. The process comprises the following steps that (1) acid is added to the acid-making wastewater to adjust the PH of the acid-making wastewater to be 2-3, so that the elemental sulfur in the acid-making wastewater is precipitated; (2) activated carbon powder is added to the wastewater treated in step (1), full stirring and uniform mixing are conducted, and activated carbon adsorbs the elemental sulfur precipitated out of the wastewater; (3) the wastewater treated in step (2)is subjected to gravity sedimentation; (4) the wastewater subjected to gravity sedimentation in step (3) is subjected to precision filtration. By means of the process, the PH value of the acid-makingwastewater is adjusted to make the elemental sulfur in the wastewater precipitated, then the elemental sulfur is adsorbed by the activated carbon, after adsorption, a majority of the activated carbonadsorbed with the elemental sulfur is settled by gravity sedimentation, through precision filtration, the activated carbon adsorbed with the elemental sulfur in the wastewater is further removed, andfinally, the elemental sulfur in the acid-making wastewater is effectively removed.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a process for removing elemental sulfur in desulfurization and denitration acid production wastewater. Background technique [0002] Coal-fired boilers are used in the production of most industrial industries in my country, and a large amount of flue gas containing sulfur dioxide and nitrogen oxides needs to be desulfurized and denitrified. With the implementation of a series of relevant environmental regulations and standards in my country, the construction of flue gas desulfurization and denitrification facilities has gradually improved, and the subsequent desulfurization and denitrification wastewater containing nitrate and sulfate is also discharged in large quantities, which is likely to cause secondary pollution. Therefore, it is necessary to treat desulfurization and denitrification wastewater. [0003] The existing acid wastewater is generally filtered and t...

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Problems solved by technology

[0003] The existing acid wastewater is generally filtered and then enters the central water plant for biochemical treatment; however, the elemental sulfur contained in the acid wastewater has a significant inhibitory effect on biochemical bacteria, which will seriously affect the biochemical effect

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