A process and device for removing heavy metal ions in sewage by pressurized dissolved air flotation
A technology of heavy metal ions and pressurized dissolved gas, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , the low efficiency of removing heavy metals, etc., to achieve the effect of improving the technical content, realizing the reuse of resources, and improving the efficiency of sewage treatment
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Embodiment 1
[0029] The technical process of removing heavy metal ions in waste water by pressurized dissolved air method described in this embodiment includes the following steps, such as figure 1 Shown:
[0030] In this example, waste water from Huize, Yunnan Province is used as the treatment object, and the waste water mainly contains pb 2+ , Zn 2+ , algae and other substances of which pb 2+ , Zn 2+ The contents were 1.5mg / L and 3.2mg / L respectively.
[0031](1) First pass calcium hydroxide into the wastewater at a ratio of 1.5g / L to neutralize the acidic ions in the wastewater, and then introduce sodium oleate at a ratio of 25mg / L to make the formed precipitate hydrophobic and achieve The wastewater was pretreated, and the pH value was adjusted to 8.5 with calcium carbonate, and the residence time was 60 min.
[0032] (2) Compressed air and return water are made into high-pressure dissolved air water.
[0033] (3) Pass the high-pressure dissolved air water into the pretreated was...
Embodiment 2
[0041] In this embodiment, waste water from Chihong, Yunnan is used as the treatment object, and the waste water mainly contains Zn 2+ , algae and other substances in which Zn 2+ 、Cd 2+ The contents were 4.5mg / L and 2.5mg / L respectively.
[0042] The simultaneous desulfurization, denitrification and demercuration dry flue gas purification process described in this embodiment includes the following steps:
[0043] (1) First pass calcium hydroxide into the wastewater at a ratio of 40kg / t to neutralize the acid ions in the wastewater, and then introduce sodium oleate at a ratio of 120kg / t to make the formed precipitate hydrophobic and achieve The wastewater was pretreated, and the pH value was adjusted to 10 with calcium carbonate, and the residence time was 60 min.
[0044] (2) Compressed air and return water are made into high-pressure dissolved air water.
[0045] (3) Pass the high-pressure dissolved air water into the pretreated wastewater obtained in step (1) according t...
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