Treatment method of textile printing industry effluent
A technology for industrial wastewater, textile printing and dyeing, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as toxic and harmful, environmental pollution, etc.
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Embodiment 1
[0031] In a printing and dyeing workshop in Hangu District, Tianjin, there are 40 printing and dyeing machines with a daily displacement of 300-500 tons. When 40 printing and dyeing machines are started at the same time, and the dyes used are different in composition, nature, and quantity, the waste water is black-red, black-yellow, black-green, etc., and the comprehensive discharge of printing and dyeing waste water uses 1 to 6 six All the treatment process of the unit: the waste water flows into the sump, adjusts the pH to about 8 with the waste alkali of our factory, and filters it through the non-woven net cage, and the volume of the net cage is about 1M 3 , and then pump the wastewater into the acidification aeration tank, the aeration tank is about 20M 3 , add sulfuric acid to adjust the pH to 3, aerate for more than 30 minutes, absorb the released hydrogen sulfide with 40% isocratic lye, pump it into a non-woven net cage for filtration, and the volume of the net cage is...
Embodiment 2
[0037] When the dyes used include basic dyes, sulfur dyes and disperse dyes, the printing and dyeing wastewater at the outlet of the factory workshop is mainly black in suspension, and the treatment method is to combine 1 and 2 units. Flow the printing and dyeing wastewater into the sump, adjust the pH to about 8 with the waste lye from our factory, and filter it through a non-woven net cage with a volume of about 1M 3 , and then pump the wastewater into the acidification aeration tank, the aeration tank is about 20M 3 , add sulfuric acid to adjust the pH to 3, aerate for more than 30 minutes, absorb the released hydrogen sulfide with 40% caustic soda of equal concentration, pump it into the non-woven net cage filter for filtration, and slightly neutralize the effluent with lye to When the PH is 6-7, the emission can reach the standard.
[0038] Wastewater before treatment: chroma 500-1000 dilution times, S ＝ 5~10mg / L,
[0039] SS is 200~500mg / L;
[0040] Efflu...
Embodiment 3
[0043] When the dyes used are soluble reactive dyes or cationic dyes, the printing and dyeing wastewater at the outlet of the factory workshop is bright red, transparent, with a chromaticity of about 2000 dilution times, and no sulfide discharge. Units 3 and 6 can be combined. Put this printing and dyeing wastewater into the oxidation pool, the oxidation pool is about 20M 3 , add sodium hypochlorite solution with a volume ratio of 0.1-0.2%, add sulfuric acid to adjust the pH to about 3.5, aerate for more than 30 minutes, and pump 140M 3 The oxidation storage pool is placed for about 12 hours, filtered through a non-woven filter, and the effluent is neutralized with an alkaline solution until the pH is 6-7. After being absorbed by the slag, it can be discharged up to the standard.
[0044] Wastewater before treatment: chromaticity 200-2000 dilution times, SS 200-500mg / L;
[0045] Effluent after treatment: chromaticity≤80 dilution times, SS≤70mg / L.
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