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An innovative intermittent-vacuum assisted thermophilic anaerobic digestion process for effective animal manure utilization and treatment
- Zhang, Renchuan, Anderson, Erik, Addy, Min, Deng, Xiangyuan, Kabir, Fayal, Lu, Qian, Ma, Yiwei, Cheng, Yanling, Liu, Yuhuan, Chen, Paul, Ruan, Roger
- Bioresource technology 2017 v.244 pp. 1073-1080
- algae culture, ammonia, ammonium sulfate, anaerobic digestion, biogas, hydrogen sulfide, hydrolysis, hydroponics, methane production, nitrogen, nitrogen content, pH, pig manure
- 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 60min from 55°C to 85°C with vacuum pressure (from 100.63±3.79mmHg to 360.91±7.39mmHg) 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 25days and 40% (from 10days to 6days) 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.