Method for efficiently removing chemical oxygen demand of pulping wastewater
A chemical oxygen demand, pulping wastewater technology, applied in chemical instruments and methods, processing wastewater treatment, water pollutants and other directions, can solve no help; Liu Xiyang et al (patent application number, Fenton dosage cannot be effectively reduced , unfavorable business operation control and other problems, to achieve the effect of improving complicated steps, saving equipment investment and low cost
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Embodiment 1
[0030] Take 1000ml of biochemical wastewater treated with microbial aerobic aeration and COD of 278ppm, and divide it into 2 groups for testing: Group A: add flocculant [polyferric sulfate (11% of total iron, 10% of basicity)] 0.6ml, 0.1 % Cationic polyacrylamide 2ml, the system was stirred and reacted for 2min under the condition of pH 5, then added Fenton's reagent (6.5% Fe 2+ 1.16ml of ferrous sulfate, 0.20ml of 27.5% hydrogen peroxide) stirring for 1min, standing for 15min, then adding liquid caustic soda to the standing wastewater to adjust the pH to 6-9, adding anionic polyacrylamide and flocculating and settling, then discharging, the treated wastewater The COD is 42ppm, the COD removal rate is 84.9%, and it meets the national GB3544-2008 "Water Pollutant Discharge Standard for Pulp and Paper Industry" about the emission limit requirements of 100ppm for pulping enterprises and 80ppm for papermaking enterprises; Group B: no flocculant, Directly add an equal amount of Fen...
Embodiment 2
[0032] Take 1000ml of biochemical wastewater treated with microbial aerobic aeration and COD of 290ppm, and divide it into 2 groups for testing: Add flocculant [polyferric sulfate (full iron 11%, basicity 10%) 0.6ml, 0.1% cationic poly Acrylamide 2ml], the system was stirred and reacted for 5min under the condition that the pH was 5, and then Fenton’s reagent (6.5% Fe 2+ 1.16ml of ferrous sulfate, 0.20ml of 27.5% hydrogen peroxide) stirring for 5min, standing for 15min, then adding slaked lime to the standing wastewater to adjust the pH to 6-9, adding anionic polyacrylamide and flocculating and settling, then discharging, the treated wastewater COD The COD removal rate is 42ppm, and the COD removal rate is 87.9%, and it meets the national GB3544-2008 "Pulp and Paper Industry Water Pollutant Discharge Standard" about the discharge limit requirements of 100ppm for pulping enterprises and 80ppm for papermaking enterprises; Group B: no flocculant, directly Add Fenton's reagent (6....
Embodiment 3
[0034] Take 1000ml biochemical wastewater treated with microbial aerobic aeration, COD is 189ppm, add flocculant [polyferric sulfate (full iron 11%, basicity 10%) 0.4ml, 0.1% cationic polyacrylamide 2ml], the system is in The reaction was stirred for 5 min under the condition of pH 6, and then Fenton's reagent (6.5% Fe 2+1.16ml of ferrous sulfate, 0.05ml of 27.5% hydrogen peroxide) stirring for 1min, standing for 20min, then adding slaked lime to adjust the pH to 6-9 in the waste water left standing after treatment, adding anionic polyacrylamide and discharging after flocculation and sedimentation, after treatment The wastewater COD is 71ppm, and the COD removal rate is 62.4%, which meets the national GB3544-2008 "Water Pollutant Discharge Standard for Pulp and Paper Industry". ml, stirred at a speed of 150r / min for 2min at a pH of 4, and left to stand for 30min. After treatment, the effluent COD was 28ppm, and the COD removal rate was 85.2%.
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