A method for the recycling and recycling of waste water from m-cresol production
A technology for waste water production and recycling, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. The effect of shortened processing cycle, low cost and simple steps
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Embodiment 1
[0034] The treated m-cresol production wastewater was taken from a chemical plant in Huaian, Jiangsu, and the water quality components are shown in Table 2.
[0035] Table 2 Example 1 intermediate cresol production wastewater water quality
[0036]
[0037] Two parts of 1.8mL (about 0.5g) NDA150 resin were loaded into two jacketed glass adsorption columns (φ8×240mm), which were the first-stage resin column and the third-stage resin column.
[0038] Fill 818mL of anion exchange resin soaked in 2mol / L sulfuric acid solution into a jacketed plexiglass adsorption column (φ47×472mm), which is the second-stage resin column.
[0039] combine figure 1 , the present embodiment a kind of method for m-cresol production waste water circulation separation quality recycling treatment, and its steps are:
[0040] A) 215mL of m-cresol production waste water that is filtered to remove suspended matter is pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 5BV...
Embodiment 2
[0048] The resin consumption of the present embodiment is the same as above.
[0049] A) 203mL of m-cresol production waste water that has been filtered to remove suspended matter is pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 3BV / h at 30°C to remove m-cresol in the waste water;
[0050] B) pump the effluent after passing through the first-stage resin column into the second-stage resin column filled with anion exchange resin at a flow rate of 5BV / h at 30°C;
[0051] C) adjust the pH of the effluent passing through the second-stage resin column to 12.3, and pump it into the third-stage resin column filled with NDA150 resin at a flow rate of 3BV / h at 30°C to achieve the removal of m-toluidine;
[0052] D) The pH of the effluent from the third-stage resin column was 12.5, and the concentrations of m-cresol and m-toluidine were 1.7 mg / L and 0.6 mg / L, respectively. Part of the effluent from the third-stage resin column was used as a regenerant...
Embodiment 3
[0057] The resin consumption of the present embodiment is the same as above.
[0058] A) 210mL of m-cresol production wastewater that was filtered to remove suspended matter was pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 2BV / h at 20°C to remove m-cresol in the wastewater;
[0059] B) pump the effluent after passing through the first-stage resin column into the second-stage resin column filled with anion exchange resin at a flow rate of 8BV / h at 30°C;
[0060] C) adjust the pH of the effluent passing through the second-stage resin column to 12.7, and pump it into the third-stage resin column filled with NDA150 resin at a flow rate of 2BV / h at 20°C to achieve the removal of m-toluidine;
[0061] D) The pH of the effluent from the third-stage resin column is 12.9, and the concentrations of m-cresol and m-toluidine are 1.4 mg / L and 0.4 mg / L respectively; part of the effluent from the third-stage resin column is used as a regeneration agent at...
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