Heavy metal thallium-containing sewage purification treatment method
A technology of sewage purification and treatment method, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of reducing the amount of ozone
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Embodiment 1
[0023] Using the fly ash of the iron and steel plant as the raw material for producing zinc sulfate, the main components of the fly ash are zinc oxide, potassium chloride and sodium chloride. The content of sodium chloride and potassium chloride in the sewage to be treated reaches 22%, the content of thallium ions reaches 100 mg / L, and the content of iron ions reaches 230 mg / L. at 30m 3 In the stainless steel reaction kettle, add the above-mentioned sewage 20m 3 , first adjust the pH value to 11 with 10% concentration of hydrogen peroxide, start the reaction kettle to stir, slowly add 120kg of sodium sulfide solution concentrated to 25% under stirring, react at normal temperature and pressure for 60min, then filter with plate and frame Filter by machine pressure, the obtained filtrate contains 0.9 mg / L of thallium ions and 186 mg / L of ferrous ions. The filtrate was sent into the oxidation tower with a pump and oxidized with ozone for 5 hours, and the total amount of ozone ad...
Embodiment 2
[0025] Zinc sulfate is produced from smelter waste residue as raw material. The main components of this waste residue are zinc oxide and sodium chloride. The sewage generated after the raw material is washed in countercurrent is used as the sewage to be treated in this embodiment, and the sodium chloride in the sewage to be treated in this embodiment is The content reaches 25%, the thallium ion content reaches 60mg / L, and the iron ion content reaches 260mg / L. 3 In the stainless steel reaction kettle, add the above-mentioned sewage 20m 3 , first adjust the pH value to 12 with the concentration of 10% hydrogen peroxide, start the reaction kettle to stir, slowly add 70kg of sodium sulfide solution concentrated to 25% under stirring, react at normal temperature and pressure for 30min, then filter with plate and frame Filter by machine pressure, the obtained filtrate contains 1.3 mg / L of thallium ions and 216 mg / L of iron ions. The filtrate was sent into the oxidation tower with a...
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