PVA precipitant and processing method for desizing waste water
A technology for desizing wastewater and treatment methods, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., which can solve the problems of large consumption, low recycling value, and difficulty in reusing PVA sedimentation agents, so as to reduce consumption and facilitate recycling Use the effect of value
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Embodiment 1
[0019] At 1000m with a PVA concentration of 3g / L and a pH of 13 3 Add primary Cu(OH) to desizing wastewater to be treated 2 1.6 tons, after standing for 2 hours, filtered through the filter tank to obtain 10 tons of filter residue and primary purified water with COD less than 1500mg / L.
[0020] Add 40% H to the obtained 10 tons of filter residue 2 SO 4 2.37 tons, get 2.47 tons of CuSO 4 , the recovery rate of copper salt reaches 94.7%, and the recovered PVA sedimentation agent is returned to the process.
Embodiment 2
[0022] With 7.0 tons of CuSO 4 and 3.5 tons of NaOH to produce primary Cu(OH) 2 4.28 tons, add 1000m of PVA concentration of 10g / L, PH of 11 3 In the desizing wastewater to be treated, after standing for 2 hours, filter through the filter tank to obtain 32 tons of filter residue and primary clean water with COD less than 1550mg / L.
[0023] Add 40% H to the obtained 32 tons of filter residue 2 SO 4 10.5 tons, get 6.42 tons of CuSO 4 , the recovery rate of copper salt reaches 91.7%, and the recovered PVA sedimentation agent is returned to the process.
Embodiment 3
[0025] At 1000m with a PVA concentration of 1g / L and a pH of 12 3 Adding primary Cu(OH) to the desizing wastewater to be treated 2 0.69 tons, after standing for 2 hours, filtered through the filter tank to obtain 3 tons of filter residue and primary purified water with COD less than 1500mg / L.
[0026] Add 40% H to the obtained 3 tons of filter residue 2 SO 4 1.5 tons, get 960Kg CuSO 4 , the recovery rate of copper salt reaches 96%, and the recovered PVA sedimentation agent is returned to the process.
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