Deep treatment method for pulping papermaking wastewater
A technology for pulping and papermaking and advanced treatment, which is applied in the direction of processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high treatment cost and no large-scale promotion and application, and achieve The effect of reducing chemical consumption, reducing processing costs, and reducing production volume
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Embodiment 1
[0046] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:
[0047] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 0.5mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 20:1, adjusted to pH 5.5 with concentrated sulfuric acid, aerated and mixed evenly, to prepare premixed wastewater;
[0048] ②. Introduce the premixed waste water prepared in step ① into the magnetization mixing reactor, add mass concentration of 27.5% hydrogen peroxide solution at multiple points according to the addition amount of 100mg / L, and magnetize it for 0.5s under the magnetization condition with a magnetic field strength of 600mT, Produce magnetized wastewater;
[0049] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tank, adjus...
Embodiment 2
[0059] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:
[0060] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 1.0mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 15:1, the pH value is adjusted to 5.8 with concentrated sulfuric acid, aerated and mixed evenly to obtain premixed wastewater;
[0061] ②. Introduce the premixed wastewater prepared in step ① into the magnetization mixing reactor, add hydrogen peroxide solution with a mass concentration of 27.5% at multiple points according to the addition amount of 150mg / L, and magnetize it for 0.8s under the magnetization condition of 650mT to obtain magnetization waste water;
[0062] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tank, adjust the oxi...
Embodiment 3
[0072] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:
[0073] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 1.5mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 10:1, adjusted to pH 6.0 with hydrochloric acid, aerated and mixed evenly, to prepare premixed wastewater;
[0074] ②. The premixed wastewater prepared in step ① is introduced into the magnetization mixing reactor, and the mass concentration of 27.5% hydrogen peroxide solution is added at multiple points according to the addition amount of 200mg / L. Under the magnetization condition of the magnetic field strength of 700mT, the magnetization is 1.0s, Produce magnetized wastewater;
[0075] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tan...
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