Mesophilic methane fermentation of chicken manure at a wide range of ammonia concentration: Stability, inhibition and recovery

Qigui Niu, Wei Qiao, Hong Qiang, Toshimasa Hojo, Yu You Li

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)

Abstract

A 12L mesophilic CSTR of chicken manure fermentation was operated for 400days to evaluate process stability, inhibition occurrence and the recovery behavior suffering TAN concentrations from 2000mg/L to 16,000mg/L. A biogas production of 0.35-0.4L/gVSin and a COD conversion of 68% were achieved when TAN concentration was lower than 5000mg/L. Ammonia inhibition occurred due to the addition of NH4HCO3 to the substrate. The biogas and COD conversion decreased to 0.3L/gVSin and 20% at TAN 10,000mg/L and was totally suppressed at TAN 16,000mg/L. Carbohydrate and protein conversion decreased by 33% and 77% after inhibition. After extreme inhibition, the reactor was diluted and washed, reducing TAN and FA to 4000mg/L and 300mg/L respectively, and the recovered biogas production was 0.5L/gVSin. The extended Monod model manifested the different sensitivities of hydrolysis, acidogenesis and methanogenesis to inhibition. VFA accumulation accompanied an increase in ammonia and exerted a toxic on microorganism.

Original languageEnglish
Pages (from-to)358-367
Number of pages10
JournalBioresource Technology
Volume137
DOIs
Publication statusPublished - 2013 Jun

Keywords

  • Ammonia inhibition
  • Chicken manure
  • Mesophilic CSTR
  • Process stability
  • Reactor recovery

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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