Synergistic co-digestion of wastewater grown algae-bacteria polyculture biomass and cellulose to optimize carbon-to-nitrogen ratio and application of kinetic models to predict anaerobic digestion energy balance

被引：39

作者：

Bohutskyi, Pavlo ^{[1
]}

Duc Phan ^{[2
,3
]}

Kopachevsky, Anatoliy M. ^{[4
,5
,6
]}

Chow, Steven ^{[2
]}

Bouwer, Edward J. ^{[2
]}

Betenbaugh, Michael J. ^{[7
]}

机构：

[1] Pacific Northwest Natl Lab, Div Biol Sci, 3300 Stevens Dr, Richland, WA 99354 USA

[2] Johns Hopkins Univ, Dept Environm Hlth & Engn, 3400 North Charles St, Baltimore, MD 21218 USA

[3] Univ Texas San Antonio, Dept Civil & Environm Engn, 1 UTSA Cir, San Antonio, TX 78249 USA

[4] VI Vernadsky Crimean Fed Univ, Dept Water Supply & Sanit Engn, Acad Construct & Architecture, 4 Prospekt Vernadskogo, UA-295007 Simferopol, Crimea, Ukraine

[5] Water Technol Res & Prod Co, 7 Petropavlovskaya St, UA-295000 Simferopol, Crimea, Ukraine

[6] Water Crimea State Unitary Enterprise, 1a Kievskaya St, UA-295053 Simferopol, Crimea, Ukraine

[7] Johns Hopkins Univ, Dept Chem Biomol Engn, 3400 North Charles St, Baltimore, MD 21218 USA

来源：

BIORESOURCE TECHNOLOGY | 2018年 / 269卷

基金：

美国国家科学基金会;

关键词：

Synergistic co-digestion of algae with cellulose; Carbon to nitrogen ratio; Biogas and methane production kinetic models; Digester energy balance; Net energy ratio; METHANE PRODUCTION; MICROALGAE PRODUCTION; BIODIESEL PRODUCTION; ORGANIC WASTES; SWINE MANURE; POLY-CULTURE; SLUDGE; PHYTOREMEDIATION; PRODUCTIVITY; PRETREATMENT;

D O I：

10.1016/j.biortech.2018.08.085

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

This study investigated enhancing methane production from algal-bacteria biomass by adjusting the C/N ratio through co-digestion with a nitrogen-poor co-substrate - cellulose. A biomethane potential test was used to determine cumulative biogas and methane production for pure and co-digested substrates. Four kinetic models were evaluated for their accuracy describing experimental data. These models were used to estimate the total energy output and net energy ratio (NER) for a scaled AD system. Increasing the algal C/N ratio from 5.7 to 20-30 (optimal algae: cellulose feedstock ratios of 35%:65% and 20%:80%) improved the ultimate methane yield by > 10% and the first ten days production by > 100%. The modified Gompertz kinetic model demonstrated highest accuracy, predicting that co-digestion improved methane production by reducing the time-lag by similar to 50% and increasing rate by similar to 35%. The synergistic effects increase the AD system energy efficiency and NER by 30-45%, suggesting potential for substantial enhancements from co-digestion at scale.

引用

页码：210 / 220

页数：11