Rapid start-up of ethanol-type fermentation with acidogenic reactor

According to the disadvantages of wastewater two-phase anaerobic treatment process as low start-up speed of ethanol-type fermentation with acidogenic reactor and sludge easily to be washed out, the ethanol-type fermentation formation of acidogenic reactor was studied by seeding anaerobic granular sludge, controlling volume loading rate, loading increased range, alkalinity, etc. The running condition of the reactor was monitored by parameters such as terminal liquid products, pH, ORP and acidifying degree etc. Test showed that the succession process from mixed acid fermentation to butyrate-type fermentation reactor to ethanol-type fermentation of reactor was completed within 34 d. At the end of start-up, the mass concentration of ethanol and acetic acid was 75.9 percent of liquid terminal products; pH value was 4.1-4.3; ORP value was-230-250 mV. The sludge properties of seed anaerobic granular sludge changed obviously. Its apparent color changed from black and grey black to khaki and snuff color. The particle size of seed granular sludge became smaller with the range of 0.50-1.25 mm.