Method for removing sulfate radical in molasses alcohol wastewater by using bagasse ash

Abstract

The invention discloses a method for removing sulfate radical in molasses alcohol wastewater by using bagasse ash. The method includes steps: (1), bagasse ash pretreatment, namely, taking 50g of bagasse ash and placing into a crucible, placing in a high-temperature ashing furnace of 800 DEG C for ashing and overnighting; and screening particles with the grain size of 0.177-0.250mm, and placing in a drying vessel after cooling for standby; (2), taking 500ml of molasses alcohol wastewater for centrifugation and separation of suspended solid; and (3), taking 100ml of wastewater obtained in the step (2) and adding water to dilute to 1000ml; using a conical flask of 300ml to take 100ml of diluent and respectively adding 10g of the bagasse ash after pretreatment in the step (2), placing in a constant-temperature rotary shaker for adsorption, adjusting temperature to be 30 DEG C and pH to be 3.5-4.5, and using a centrifugal machine of 6000rpm for centrifugation for 10min after adsorption for 60min. The bagasse ash is used to adsorb and precipitate the sulfate radical in the molasses alcohol wastewater to improve anaerobic methane production rate, so that generation of smelly gases such as hydrogen sulfide is reduced, and anaerobic reaction treatment and gas production efficiency is improved.

Description

technical field [0001] The invention relates to a method for removing sulfate radicals in molasses alcohol waste liquid by bagasse ash—adding pretreated bagasse ash to molasses alcohol waste liquid, and free sulfate ions are adsorbed to the surface of bagasse particles containing metal oxides Or the metal ions dissolved by the acidic molasses alcohol waste liquid directly react with sulfate ions to form precipitates and remove them, so as to realize the liquid-solid separation of sulfate ions. . Background technique [0002] Guangxi has an annual crushing capacity of 60 million tons of sugar cane, which can produce 2 million tons of molasses alcohol waste liquid and 14.8 million tons of bagasse. Because bagasse fuel has no sulfur dioxide emissions and is cheaper than coal, it can reduce the emission costs of sugar factories. At present, all the bagasse in Guangxi sugar factories is used for boiler fuel and pulp and paper making, of which 75% or about 11 million tons are use...

AI Technical Summary

Problems solved by technology

[0004] The molasses alcohol waste liquid contains a large amount of sulfate, chloride ions and organic acids, which seriously corrodes the wastewater treatment device. At the same time, the molasses alcohol waste liquid contains a high concentration of sulfate ions, which are harmful to anaerobic microorganisms after the action of sulfate radical reducing bacteria The toxic hydrogen sulfide reduces the efficiency of anaerobic reaction treatment and gas production, and becomes the bottleneck of the biological treatment of molasses alcohol waste liquid and its resource utilization