Sewage treatment method in synthetic rubber production
A sewage treatment method and synthetic rubber technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of synthetic rubber sewage effluent not meeting discharge standards, high investment cost, Problems such as the complete oxidation treatment of rubber sewage cannot be applied to achieve the effects of pollutant emission reduction, safe and reliable operation, and great practical significance
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[0028] Example 1
[0029] A synthetic rubber production sewage (COD 922.3mg / L, flow rate 150 m 3 / h) Enter figure 1 In the process flow shown, the main process parameters of each treatment unit are as follows: the pretreatment unit adds NaOH to adjust the pH to 8.5, the added amounts of PAC and PMA are 200 mg / L and 4 mg / L, respectively, and the air flotation residence time is 0.5 h. The effluent COD of this unit is 719mg / L, and the COD removal rate is 22%.
[0030] The sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD is reduced to 371.3mg / L, and the COD is treated by 48%.
[0031] The sewage then enters the hydrolysis acidification tank with a hydraulic retention time of 8 hours, dissolved oxygen DO: 0.3 mg / L, and sludge concentration MLSS: 8000 mg / L. The B / C of this unit is increased from 0.3 to 0.5, the effluent COD concentration is 295mg / L, and the COD removal rate is 21%...
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[0034] Example 2
[0035] A synthetic rubber production wastewater (COD is 1069mg / L, flow rate is 200 m 3 / h) Enter figure 1 In the process flow shown, the main process parameters of each treatment unit are: the pretreatment unit adds NaOH to adjust the pH to 8.9, the added amounts of PAC and PMA are 300 mg / L and 5 mg / L, respectively, and the air flotation residence time is 1 h. The effluent COD of this unit is 965mg / L, and the COD removal rate is 21%.
[0036] Sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD is reduced to 495mg / L, and the COD treatment reaches 43%.
[0037] The sewage then enters the hydrolysis acidification tank with a hydraulic retention time of 13 hours, dissolved oxygen DO: 0.2 mg / L, and sludge concentration MLSS: 9000 mg / L. The B / C of this unit is increased from 0.4 to 0.6, the effluent COD concentration is 309mg / L, and the COD removal rate is 21%.
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[0040] Example 3
[0041] A certain synthetic rubber production sewage (COD is 761.2mg / L, flow rate is 120 m 3 / h) Enter figure 1 In the process flow shown, the main process parameters of each treatment unit are: the pretreatment unit adds NaOH to adjust the pH to 7.5, the added amounts of PAC and PMA are 200 mg / L and 3 mg / L, respectively, and the air flotation residence time is 0.5 h. The effluent COD of this unit is 601mg / L, and the COD removal rate is 21%.
[0042] Sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD is reduced to 312mg / L, and the COD treatment reaches 48%.
[0043] The sewage then enters the hydrolysis acidification tank with a hydraulic retention time of 10.0h, dissolved oxygen DO0: 0.15 mg / L, and sludge concentration MLSS: 7000 mg / L. The B / C of this unit is increased from 0.3 to 0.5, the effluent COD concentration is 234mg / L, and the COD removal rate is 25...
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