MESSAI.iO

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Specialized MEC research in advanced-systems focusing on advanced-configuration, process-integration, substrates. Due to the limited hydrolysis rate of particulate organics and suitable substrates for hydrogen-producing bacteria in raw waste ac...

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What they did

System
MEC

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Abstract

Due to the limited hydrolysis rate of particulate organics and suitable substrates for hydrogen-producing bacteria in raw waste activated sludge (WAS), traditional fermentative hydrogen production has low hydrogen yield and energy recovery efficiency. The role of free nitrous acid (FNA) pretreatment on WAS and hydrogen recovery was investigated in a prefermentation–microbial electrolysis cells (MECs) system. The results demonstrated that WAS hydrolysis and acidification were enhanced by FNA pretreatment. Notably, the accumulation of acetic acid and propionic acid eventually reached to 55% and 22% during prefermentation. During MECs cascade utilization, volatile fatty acids (VFAs) were exhausted and the utilization efficiencies of soluble carbohydrates and proteins reached 62% and 41.5%, respectively. The hydrogen yield from FNA-pretreated sludge was 1.44 mL/g of volatile suspended solids, which was approximately 3 times than that of the control. High-throughput sequencing and canonical correspondence anal...

Keywords

Activated sludgeHydrogen productionHydrolysisNitrous acidHydrogenFermentation

Identifiers

DOI
10.1021/ACSSUSCHEMENG.7B04201
Journal
ACS Sustainable Chemistry & Engineering
Year
2018