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

Abstract

The invention discloses a method for removing sulfate radicals in molasses alcohol waste liquid with bagasse ash. (1) Pretreatment of bagasse ash: put 500g of bagasse ash into a crucible, put it into a high-temperature ashing furnace at 800°C for overnight ashing; sieve out a particle diameter of 0.177‐0.250mm, and put it into a drying dish after cooling (2) take 500mL of molasses alcohol waste liquid and carry out centrifugation to separate suspended solids; (3) take 100mL of waste liquid obtained in step (2) and add water to dilute to 1000mL; Add 10g of bagasse ash pretreated in step (1), and perform adsorption in a constant temperature rotary oscillator. Centrifuge for 10 minutes. The invention utilizes bagasse ash to adsorb and precipitate sulfate ions in molasses alcohol waste liquid to increase its anaerobic methane production rate, thereby reducing the generation of hydrogen sulfide and other odorous gases, and improving anaerobic reaction treatment and gas production efficiency.

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 used f...