Method for strengthening treatment of printing and dyeing wastewater by printing and dyeing sludge firing product and acid leaching solution thereof
A printing and dyeing wastewater and printing and dyeing sludge technology, applied in water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, combustion methods, etc.
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Embodiment 1
[0025] Treatment effect of residue acid leaching solution on printing and dyeing wastewater influent after sludge burning
[0026] Dewatered sludge from a printing and dyeing factory, placed in an oven at 105°C for 2 hours, then placed in a muffle furnace at 650°C for 4 hours at high temperature, cooled and ground through a 100-mesh sieve;
[0027] Reaction conditions of acid leaching solution: reaction temperature 100°C, reaction time 2h, liquid-solid ratio 4mL / g, concentrated sulfuric acid 0.4mL / g, concentrated hydrochloric acid 1.2mL / g, iron dissolution rate 75.4%, aluminum dissolution rate 79.2%;
[0028] Take 200mL of printing and dyeing wastewater raw water (incoming water to the system), add acid leaching solution, stir rapidly for 2 minutes (300r / min), and stir slowly for 4 minutes (50r / min), the amount of acid leaching solution added (dosing amount) is 1.2mL / L.
[0029] After the treatment, the pH of the influent water decreased from 11 to 7.26, the CODcr decreased by...
Embodiment 2
[0031] Treatment effect of residue acid leaching solution on printing and dyeing wastewater influent after sludge burning
[0032] Take the dewatered sludge from a printing and dyeing factory, place it in an oven at 105°C for 2 hours, then place it in a muffle furnace at 650°C for 4 hours, and grind it through a 100-mesh sieve after cooling;
[0033] Reaction conditions for acid leaching solution: reaction temperature 80°C, reaction time 2h, liquid-solid ratio 4mL / g, concentrated sulfuric acid 0.4mL / g, concentrated hydrochloric acid 1.4mL / g, iron dissolution rate 79.4%, aluminum dissolution rate 84.2%;
[0034] Take 200mL of printing and dyeing wastewater raw water (incoming water to the system), add acid leaching solution, stir rapidly for 2 minutes (300r / min), and stir slowly for 4 minutes (50r / min), the amount of acid leaching solution added (dosing amount) is 0.8mL / L.
[0035] After treatment, the pH of the influent water decreased from 11 to 8.64, the CODcr decreased by 9...
Embodiment 3
[0037] Treatment effect of residues after sludge burning on the effluent of printing and dyeing wastewater
[0038] Take the dewatered sludge from a printing and dyeing factory, place it in an oven at 105°C for 2 hours, then place it in a muffle furnace at 650°C for 4 hours, and grind it through a 100-mesh sieve after cooling;
[0039] Take the effluent from the secondary sedimentation tank after the treatment of the printing and dyeing wastewater treatment system as the test water, add 0.03% by mass of residue after burning (dosage dosage), stir for 0.5h, and then separate by static sedimentation.
[0040] The effluent CODcr decreased from 54mg / L to 40mg / L, and the dye concentration decreased from 1.97mg / L to 1.25mg / L.
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