An innovative intermittent-vacuum assisted thermophilic anaerobic digestion process for effective animal manure utilization and treatment

Renchuan Zhang, Erik Anderson, Min Addy, Xiangyuan Deng, Fayal Kabir, Qian Lu, Yiwei Ma, Yanling Cheng, Yuhuan Liu, Paul Chen, Roger Ruan

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Intermittent-vacuum stripping (IVS) was developed as a pretreatment for thermophilic anaerobic digestion (TAD) to improve methanogenesis and hydrolysis activity through preventing free ammonia and hydrogen sulfide (H2S) inhibition from liquid swine manure (LSM). Over 98% of ammonia and 38% organic nitrogen were removed in 60 min from 55 °C to 85 °C with vacuum pressure (from 100.63 ± 3.79 mmHg to 360.91 ± 7.39 mmHg) at initial pH 10.0 by IVS. Thermophilic methanogenesis and hydrolysis activity of pretreated LSM increased 52.25% (from 11.56 ± 1.75% to 17.60 ± 0.49%) in 25 days and 40% (from 10 days to 6 days) in bio-methane potential assay. Over 80% H2S and total nitrogen were removed by IVS assistance, while around 70% nitrogen was recycled as ammonium sulfate. Therefore, IVS-TAD combination could be an effective strategy to improve TAD efficiency, whose elution is more easily utilized in algae cultivation and/or hydroponic system.

Original languageEnglish (US)
Pages (from-to)1073-1080
Number of pages8
JournalBioresource Technology
Volume244
DOIs
StatePublished - Jan 1 2017

Keywords

  • Ammonia inhibition
  • Hydrogen sulfide inhibition
  • Intermittent-vacuum stripping (IVS)
  • Thermophilic anaerobic digestion
  • Waste water treatment

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