Treatment method for radical curing of black liquor of straw pulp from alkaline process
A technology of straw pulp black liquor and treatment method, which is applied in the directions of anaerobic digestion treatment, chemical instruments and methods, processing wastewater treatment, etc., can solve the problems of high operating cost, high operating cost, equipment corrosion, etc., and achieves a complete solution to pollution. , The effect of mature process route and less one-time investment
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example 1
[0030] Example 1: A reed soda pulping enterprise with a production scale of 100,000 tons per year has a black liquor volume of 2400 cubic meters per day, and its fresh black liquor has a solid content of 16.8%, is dark black, and has a pH value of 13.6. Try the method of the present invention, after the fresh black liquor enters the bioreactor for 11 hours, the outlet material is khaki, with a pH value of 7.8 and obvious odor, and after 2 hours of aeration, the pH value rises to 8.9 without odor After being evaporated and concentrated by a six-effect evaporator, the concentration reaches 67.5%. After the material is sent to the spray granulation system, the product with a particle size of 1.0-1.2mm can be successfully produced under the condition of hot air temperature controlled at 295°C. All products are sold to Thermal power plants are used as grinding aids, combustion aids, and desulfurizers.
example 2
[0031] Example 2: A pulping and papermaking enterprise uses asparagus as raw material for pulping and uses alkaline pulping. The actual annual output is 55,000-60,000 tons, and the amount of black liquor produced per day is 1,800-2,000 cubic meters. Fresh black liquor The specific situation is: the PH value is 12-13, it is dark black, and the solid content is 15%. The enterprise adopts the process design of the present invention, and the total investment of each system is 22 million yuan. During the trial operation of the equipment, the fresh black liquor enters the bioreactor, and the residence time is 15 hours. There is obvious odor, the material is sent into the aeration system, the net residence time is 1.5 hours, the pH value rises to 8.5, basically no odor, the concentration after evaporation and concentration of the six-effect evaporator is controlled at 65%, the material is sent into The spray granulator, under the condition of drying temperature of 290-295 ℃, forms pr...
example 3
[0032] Example 3: A pulp and paper mill with rice straw as the main pulping raw material adopts an alkaline cooking process, with an annual pulping scale of 50,000 tons and a daily black liquor production of 1,500 cubic meters. The black liquor has a pH value of 13- 13.5, 15.5% solids, dark black. During the trial process of the method of the present invention, fresh black liquor enters the anaerobic bioreactor, and under the action of the active flora, when the net residence time reaches 12 hours, the material is discharged, and the outlet material turns grayish red with obvious odor. When the aeration time reaches 2 hours, the PH value rises to 8.5, and there is no smell, and there is no foam after continuing to aerate; the material is sent to The six-effect evaporator evaporates, in order to facilitate the smooth spraying of the subsequent process, after repeated tests, the concentration of the outlet material should be controlled at 58-60%; the material coming out of the e...
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