Potassium Ferrate Enhanced Anaerobic Fermentation of Excess Sludge to Produce Volatile Fatty Acids
In view of the low efficiency of volatile fatty acid production by excess sludge(ES)anaerobic fermentation,this sutdy ana-lyzed the method to produce VFA potassium ferrate(PF)by enhanced ES anaerobic fermentation.The mechanism of PF enhanced ES an-aerobic fermentation was analyzed.The results showed that increasing the concentration of PF was beneficial to the accumulation of VFA,and when the content of PF was 5%,the maximum yield of VFA was 251.6 mg/g VSS,which was about2.45 times that in the control.PF increased the release of organic matter from ES,and the maximum soluble COD(SCOD)was 1856 mg/L.PF promoted the concentra-tion of soluble proteins and polysaccharides in ES,which was beneficial to the subsequent acidification process.High concentration of PF reduced the biogas accumulation in ES fermentation and reduced the consumption of VFA.Enzymatic analysis showed that PF promoted the activity of enzymes related to hydrolysis and acidification,but decreased the activity of enzymes related to methanogenesis.The results provide an alternative for ES anaerobic fermentation to accumulate VFA.
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