Method for treating folic acid wastewater

[0028] First, take 200ml of folic acid wastewater, the pH of folic acid wastewater is 0.5, the COD value is 2000mg / L, the ammonia nitrogen value is 210mg / L, and the total dissolved solids is 25000mg / L; add sodium hydroxide, adjust the pH to 4.3, and obtain the solution; then, pour the solution to be treated into the filter tank, and filter it with a filter membrane of 0.45 μm; after the filtration is completed, obtain the filtrate; then pour the filtrate into the rotary evaporator to ensure that the pressure is controlled at 0.04Mpa and the temperature is 80 °C, the concentration rate is 50%, and after the distillation is completed, a condensate is obtained, that is, effluent is obtained.

[0029] Measure the content of COD, ammoniacal nitrogen and TDS in the effluent of Example 1, wherein the removal rate of COD is 97.9%, the extraction rate of ammoniacal nitrogen is 93.9%, and the removal rate of TDS is greater than 99%.

[0031] First, take 100ml of folic acid wastewater, the pH of folic acid wastewater is 1.1, the COD value is 9500mg / L, the ammonia nitrogen value is 330mg / L, and the total dissolved solids is 42000mg / L; add sodium hydroxide, adjust the pH to 4.2, and obtain the solution; then, pour the solution to be treated into the filter tank, and filter it with a 0.22 μm filter membrane; after the filtration is completed, obtain the filtrate; then pour the filtrate into a rotary evaporator to ensure that the pressure is controlled at 0.06Mpa and the temperature is 90 °C, the concentration rate is 60%, and after the distillation is completed, a condensate is obtained, that is, effluent is obtained.

[0032] Measure the content of COD, ammoniacal nitrogen and TDS in the effluent of Example 2, wherein the removal rate of COD is 99.4%, the extraction rate of ammoniacal nitrogen is 95.7%, and the removal rate of TDS is greater than 99%.

[0034] First, take 500ml of folic acid wastewater, the pH of folic acid wastewater is 2.3, the COD value is 30000mg / L, the ammonia nitrogen value is 600mg / L, and the total dissolved solids is 60000mg / L; add sodium hydroxide, adjust the pH to 4.0, and obtain solution; then, pour the solution to be treated into the filter tank, and filter it with a filter membrane of 0.45 μm; after the filtration is finished, obtain the filtrate; then pass the filtrate into the MVR reactor to ensure that the pressure is controlled at 0.05Mpa and the temperature is 85 °C, the concentration rate is 50%, and after the distillation is completed, a condensate is obtained, that is, effluent is obtained.

[0035] Measure the content of COD, ammoniacal nitrogen and TDS in the effluent of Example 3, wherein the removal rate of COD is 99.8%, the extraction rate of ammoniacal nitrogen is 98.5%, and the removal rate of TDS is greater than 99%.