Treatment method of high-concentration waste water during methanol-to-olefin process
A technology of methanol to olefins and a treatment method is applied in the field of treatment of high-concentration methanol to olefins process wastewater, which can solve the problems of reducing the total amount of MTO pollutants, and achieve the effects of stable treatment effect, simple operation and low treatment cost.
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Embodiment 1
[0075] The high-concentration MTO process wastewater undergoes homogenization treatment with an average residence time of 24 hours in the homogeneous adjustment unit, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: water temperature is 35°C, pH is 6.5, and COD is 45500mg / L, the content of methanol is 9500mg / L, the content of acetic acid is 4050mg / L, the content of acetone is 6650mg / L, the content of petroleum is 900mg / L, the content of SS is 2300mg / L, and the conductivity is 3560μS / cm.
[0076] In the oil separation coagulation sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, wherein the dosage of polyaluminum chloride is 50mg / L, and the dosage of polyacrylamide is 5mg / L. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 20mg / L, and the SS dropped to 50mg / L.
[0077] In the high-efficiency anaerobic treatment ...
Embodiment 2
[0081] The high-concentration MTO process wastewater is homogenized in the homogeneous adjustment unit with an average residence time of 12 hours, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: water temperature is 25°C, pH is 7.0, and COD is 50500mg / L, the content of methanol is 10100mg / L, the content of acetic acid is 4500mg / L, the content of acetone is 7200mg / L, the content of petroleum is 1050mg / L, the content of SS is 5200mg / L, and the conductivity is 4560μS / cm.
[0082] In the oil separation coagulation sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, wherein the dosage of polyaluminum chloride is 80mg / L, and the dosage of polyacrylamide is 5mg / L. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 35mg / L, and the SS dropped to 65mg / L.
[0083] In the high-efficiency anaerobic treatment unit, anaerobic gr...
Embodiment 3
[0087] The high-concentration MTO process wastewater is homogenized in the homogeneous adjustment unit with an average residence time of 12 hours, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: the water temperature is 40°C, the pH is 7.5, and the COD is 55500mg / L, the content of methanol is 11000mg / L, the content of acetic acid is 4950mg / L, the content of acetone is 8000mg / L, the content of petroleum is 1450mg / L, the content of SS is 7800mg / L, and the conductivity is 5960μS / cm.
[0088] In the oil separation coagulation and sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, and the dosage of polyaluminum chloride is 120mg / L, and no polyacrylamide is added. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 45mg / L, and the SS dropped to 70mg / L.
[0089] In the high-efficiency anaerobic treatment unit, anaerobic ...
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