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Effects of zero-valent iron and enzymes on the anaerobic co-digestion of sewage sludge and corn silage

Zhou Haidong, Cao Zhengcao, Ying Zhenxi, Liu Jicheng, Hu Tao, Zhang Mingquan, Zhang Jingyuan

Environment Protection Engineering

2020

Vol. 46, nr 4

41--56

Anaerobic co-digestion of sewage sludge and corn silage with zero-valent iron powder (Fe0), cellulase, and papain as reinforcement means was conducted. COD-based feeding ratio of sewage sludge to corn silage was set to 2:1, the solids retention time (SRT) 20 day, digestion temperature 35 °C, and mixing speed 60 rpm. Removal rates of total COD during the control group, and Fe0, papain, cellulase, and papain, Fe0, and the two kinds of enzyme-added tests were 38.04, 41.02, 34.62, 34.55, 35.42, and 48.21%, respectively. The corresponding biogas production was 2.12, 2.62, 2.22, 2.41, 2.25, and 2.81 dm3/day, respectively. The results indicated the addition of cellulase, and papain could maximize the decomposition and hydrolysis of organic matter in sewage sludge and corn silage to volatile fatty acids. Fe0 could reduce the redox potentials of the anaerobic co-digestion, optimize the circumstances of the methanogenesis stage, accelerate biogas production, and improve biogas components. Fe0 and enzymes played a synergistic role in the anaerobic co-digestion system. Life cycle assessment indicated that the anaerobic co-digestion of sludge and corn silage co-substrates could benefit the economy, environment, and social development under the synergistic action of Fe0 and enzymes.

Anaerobic digestion and microwave pyrolysis techniques for recycling organic wastes

Butlewski Krystian

Polimery

2019

T. 64, nr 11-12

811--817

Two promising techniques – anaerobic digestion (AD) and microwave pyrolysis (MP) – have been presented in this work for possible recycling of organic waste. The main products of AD are biogas and digestate, which can be utilized for production energy, fuels and valuable materials. MP products are gases, liquids and char, which can be used as substrates for producing hydrogen, biodiesel, kerosene, and activated carbon. MP provides fast heating and can be used for various material waste blends including biomass – plastic mixtures. AD and MP can be combined for a synergic effect with respect to system efficiency.

W pracy przedstawiono dwie nowoczesne techniki – beztlenową fermentację (AD) i mikrofalową pirolizę (MP) w kontekście możliwości ich wykorzystania w recyklingu odpadów organicznych. Głównymi produktami AD są biogaz i poferment stosowane w produkcji energii, paliw i wartościowych materiałów. Produktami MP są natomiast gaz, ciecz i substancja węglowa stanowiące materiał wejściowy do produkcji wodoru, biodiesla, nafty i węgla aktywowanego. Technika MP zapewnia szybkie nagrzewanie i może być wykorzystana w wypadku różnych mieszanin materiałów odpadowych, m.in. mieszanin biomasy z „plastikami”. Instalacje AD i MP mogą być stosowane łącznie w celu uzyskania synergii wytwarzania energii, paliw i wartościowych wyrobów.