Digestive performance of sludge with different crop straws in mesophilic anaerobic digestion

Yongdong Chen; Ziyan Zhao; Huijing Zou; Haifeng Yang; Tong Sun; Mingxing Li; Hongxiang Chai; Li Li; Hainan Ai; Dezhi Shi; Qiang He; Li Gu

doi:10.1016/j.biortech.2019.121595

Digestive performance of sludge with different crop straws in mesophilic anaerobic digestion

Bioresour Technol. 2019 Oct:289:121595. doi: 10.1016/j.biortech.2019.121595. Epub 2019 Jun 1.

Authors

Yongdong Chen¹, Ziyan Zhao¹, Huijing Zou¹, Haifeng Yang¹, Tong Sun², Mingxing Li², Hongxiang Chai¹, Li Li¹, Hainan Ai¹, Dezhi Shi¹, Qiang He¹, Li Gu³

Affiliations

¹ Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Urban Construction and Environmental Engineering, Chongqing University, 174 Shapingba Road, Chongqing 400045, PR China.
² Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Urban Construction and Environmental Engineering, Chongqing University, 174 Shapingba Road, Chongqing 400045, PR China; General Research Institute of Architecture & Planning Design Co. LTD., Chongqing University, 174 Shapingba Road, Chongqing 400045, PR China.
³ Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Urban Construction and Environmental Engineering, Chongqing University, 174 Shapingba Road, Chongqing 400045, PR China. Electronic address: guli@cqu.edu.cn.

PMID: 31203179
DOI: 10.1016/j.biortech.2019.121595

Abstract

This study evaluated the digestive performance of excess sludge and different crop straws. Methane production, hydrolytic and acidogenic performance of different substrates were specially focused. Results showed that wheat straw presented the highest experimental biochemical methane potential (BMP, 462.5 mL/g VS_removal). Corn cob-added digester obtained the highest VS removal (68.8%) and the lowest methane content due to its high hemicellulose content. Kinetic studies showed that addition of crop straws could shorten the lag phase and accelerate the hydrolysis of substrates. 3DEEM results indicated that lignocellulosic compositions play important roles in sludge hydrolysis, while FE-SEM analysis showed that the lignocellulosic textures of different crop straws determine their hydrolytic performances. Microbial community and diversity results showed that the crop straws in sludge provided abundant nutrients and their unique structures supplied attachment points for microorganisms, which ensured the efficient operation of digestive process.

Keywords: Acidogenic performance; Different crop straws; Hydrolytic performance; Lignocellulose components; Lignocellulosic textures; Methane production.

MeSH terms

Anaerobiosis
Bioreactors
Hydrolysis
Kinetics
Methane*
Sewage*

Substances

Sewage
Methane