Biological and chemical pretreatment methods using liquid fraction of digestate (LFD), ammonia solution
(AS), and NaOH were compared in the process of mesophilic anaerobic co-digestion of cattle manure and
corn stover. The results showed that LFD pretreatment could achieve the same effect as the chemical
pretreatment (AS, NaOH) at the performance of anaerobic digestion (AD). Compared with the untreated
corn stover, the cumulative biomethane production (CBP) and the volatile solid (VS) removal rate of three
pretreatment methods were increased by 25.40–30.12% and 14.48–16.84%, respectively, in the
co-digestion of cattle manure and corn stover. T80 was 20–37.14% shorter than that of the control test
(35 ± 1 days). LFD pretreatment not only achieved the same effect as chemical pretreatment, but also
reduced T80 and improved buffer capacity of anaerobic digestion system. Therefore, this study provides
meaningful insight for exploring efficient pretreatment strategy to stabilize and enhance AD performance
for practical application.
Biological and chemical pretreatment methods using liquid fraction of digestate (LFD), ammonia solution(AS), and NaOH were compared in the process of mesophilic anaerobic co-digestion of cattle manure andcorn stover. The results showed that LFD pretreatment could achieve the same effect as the chemicalpretreatment (AS, NaOH) at the performance of anaerobic digestion (AD). Compared with the untreatedcorn stover, the cumulative biomethane production (CBP) and the volatile solid (VS) removal rate of threepretreatment methods were increased by 25.40–30.12% and 14.48–16.84%, respectively, in theco-digestion of cattle manure and corn stover. T80 was 20–37.14% shorter than that of the control test(35 ± 1 days). LFD pretreatment not only achieved the same effect as chemical pretreatment, but alsoreduced T80 and improved buffer capacity of anaerobic digestion system. Therefore, this study providesmeaningful insight for exploring efficient pretreatment strategy to stabilize and enhance AD performancefor practical application.
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