Method for treating acidic wastewater of acrylic acid device
An acid waste water, acrylic acid technology, applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of difficult biological method, difficult to meet the national environmental protection discharge standard, high treatment cost, and achieve energy saving. Significant effect, significant emission reduction effect, significant effect of resource utilization
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Embodiment 1
[0015] In a four-necked reaction flask equipped with a magnetic stirrer, a condenser, and a thermometer, 300 g of acidic waste water with a formaldehyde content of 1.55 wt % and a pH value of 2.5 was added successively, and 7H 2 O Ferrous sulfate 0.253g, start the stirrer, when the temperature rises to 60°C, start to drop 35.23g of 30% hydrogen peroxide, the reaction time is 1h, and the final reaction temperature is 85°C. The content of formaldehyde in the oxidation solution is 0.002wt%, and the removal rate of formaldehyde is 99.87%.
Embodiment 2
[0017] In the 1m equipped with electric stirrer and external circulation heat exchanger 3 In the stainless steel open tank reactor, 530kg of acid waste water with a formaldehyde content of 2.04wt%, a pH value of 2.5, and a COD value of 52765mg / L were added successively, and the 7H 2 O ferrous sulfate 450g, start the agitator, start the circulation pump, open the heating steam valve, raise the temperature to 60°C, use the liquid level to add 50kg of 27.5% hydrogen peroxide dropwise, the reaction time is 3h, and the final reaction temperature is 80°C. The content of formaldehyde in the oxidation solution is 0.005wt%, the removal rate of formaldehyde is 99.75%, the COD value of the oxidation solution is 34593mg / L, and the removal rate of COD is 34.44%.
Embodiment 3
[0019] In the 1m equipped with electric stirrer and external circulation heat exchanger 3 In the stainless steel open tank reactor, the oxidizing solution obtained in Example 2 was added under the condition of 80 ℃, and 28kg of industrial grade sodium carbonate was added to neutralize acidic substances such as acetic acid, and the pH value of the neutralizing solution was 8.5. And the time is 40min, the consumption quota of industrial grade sodium carbonate per ton of acid wastewater is 52.83kg. After the neutralization solution is filtered, it is used as the raw material for the next step of RO membrane separation.
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