Method for treating coking biochemical effluent by microwave-oxidation-coagulation technology
A technology for biochemical effluent and technical treatment, applied in the direction of oxidation water/sewage treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve COD, total cyanide chromaticity difficult to meet discharge and reuse standards, The external drainage cannot meet the requirements of production reuse, and the internal circulation of coking production water has not been realized, so as to achieve the effects of reducing project land and investment costs, improving sewage treatment efficiency, reducing production and operation costs and operating labor load
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Embodiment 1
[0030] The method for microwave treatment of coking biochemical effluent provided by the present invention undergoes the following process steps:
[0031] A. Add H to the coking biochemical effluent to be treated 2 o 2 Mix reagent with ferrous chloride to the mass concentration of hydrogen peroxide in water is 0.01%, stir and mix, make the mixed solution pH value be 6.0, wherein, H 2 o 2 The mixing ratio with ferrous chloride is H 2 o 2 : Fe 2+ = molar ratio of 10:1;
[0032] B. Send the mixed solution in step A into an industrial microwave oven with a power of 40kW and a working temperature of 5-30°C, and let it act in the microwave field for 5s;
[0033] C. Adjust the pH value to 8.5 with milk of lime for the mixed liquor treated by microwave in step B, and adjust the pH value to 8.5 when the aeration rate is 10m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 4 hours, the upper liquid and the lower sludge are separated by sedimentati...
Embodiment 2
[0039] The present invention is accomplished through the following technical solutions: a method for treating coking biochemical effluent by microwave-oxidation-coagulation technology, which is characterized in that it undergoes the following process steps:
[0040] A. Add H to the coking biochemical effluent to be treated 2 o 2 with FeC 2 o 4 The mixed reagent of (ferrous oxalate) is 1% to the mass concentration of hydrogen peroxide in water, stirs and mixes, and makes mixed solution pH value be 2.0, wherein, H 2 o 2 with FeC 2 o 4 The mixing ratio is: H 2 o 2 : Fe 2+ = 3:1 molar ratio;
[0041] B. Send the mixed solution in step A into an industrial microwave oven with a power of 10kW and a working temperature of 5-30°C, and let it act in the microwave field for 60s;
[0042] C. Adjust the pH of the mixed solution in step B to 8.0 with sodium hydroxide, and the aeration rate is 40m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 1 h...
Embodiment 3
[0048] The method for microwave treatment of coking biochemical effluent provided by the present invention undergoes the following process steps:
[0049] A. Add H to the coking biochemical effluent to be treated 2 o 2 Mix reagent with ferrous carbonate to the mass concentration of hydrogen peroxide in water is 0.18%, stir and mix, make the mixed solution pH value be 4.0, wherein, H 2 o 2 The mixing ratio with ferrous carbonate is: H 2 o 2 : Fe 2+ = molar ratio of 1:4;
[0050] B. Send the mixed solution in step A into an industrial microwave oven with a power of 10kW and a working temperature of 5-30°C, and let it act in the microwave field for 30s;
[0051] C. Adjust the pH to 7.5 with milk of lime for the mixed liquor treated by microwave in step B. When the aeration rate is 30m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 2 hours, the upper liquid and the lower sludge are separated by sedimentation, and the sludge is sent to the ...
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