Effect of inoculation with a microbial consortium that degrades organic acids on the composting efficiency of food waste

Abstract

SummaryIn order to overcome the excessive acidification problem, a microbial consortium for the degradation of organic acids (MCDOA), which acts synergistically in degrading organic acids, was developed and used as an inoculum to improve the efficiency of food waste composting. MCDOA could eliminate the initial lag phase of the pile temperature rise because of excessive acidification and effectively shorten the composting period. Fluorescence regional integration analysis of the excitation‐emission matrix spectra of dissolved organic matter showed that compared with raw material, in compost with MCDOA inoculation, the percent fluorescence response (P i,n) values of Regions I, II and IV decreased by 95.11%, 94.19% and 87.41%, respectively, and P i,n of Region V increased by 172.57%. The decreased and increased levels were markedly higher than in the two control groups (MgO and K2 HPO 4 treatment, and uninoculated compost). These findings revealed that MCDOA accelerated the degradation of proteinaceous compounds and the formation of complicated humic‐like materials. Bacterial profiles implied that MCDOA could improve the indigenous bacterial community structure and diversities of acetic and propionic acid‐degrading and lignin‐degrading bacteria, which might account for the high composting efficiency and degree of humification of the inoculated compost.

High-Value-Added Compound Recovery with High-Temperature Hydrothermal Treatment and Steam Explosion, and Subsequent Biomethanization of Residual Strawberry Extrudate

“…The decrease in the total phenol content at 170 • C could be explained by the thermosensitive character of some bioactive compounds in the strawberry, which are usually degraded at high temperatures [18,19]. At 220 • C, although some thermosensitive compounds would be also degraded, the steam-explosion pre-treatment is able to alter the cellulose and, even, partially the lignin [26], releasing phenolic compounds that were not available after less severe hydrothermal treatments [27,28].…”

Aceleração do Processo de Compostagem

“…Dentre os aditivos, os inoculantes também são citados em muitos estudos (Abdel-Rahman et al, 2016;Awasthi et al, 2015;Awasthi et al, 2018b;Barrena et al, 2006;Hemati;Aliasgharzad;Khakvar, 2018;Nissaikla, 2014;Kato;Miura, 2008;Krusir et al, 2019;Li et al, 2017;Maji et al, 2015;Mat Saad et al, 2013;Nakasaki et al, 1996;Araya;Mimoto, 2013;Hirai, 2017;Dam;Sen, 2012;Saffari et al, 2017;Sharma et al, 2014;Song et al, 2018aSong et al, , 2018bTran;Nakasaki, 2015;Voběrková et al, 2017;Wang et al, 2015;Wei et al, 2019;Xi et al, Os inoculantes são micorganismos adicionados ao material a ser compostado com o objetivo de acelerar o processo (Awasthi et al, 2018b;Heidarzadeh; Amani; Javadian, 2019; Hemati; Aliasgharzad; Khakvar, 2018; Krusir et al, 2019;Song et al, 2018aSong et al, , 2018bWei et al, 2019;Yang et al, 2018). Nakasaki et al (1996) em sua pesquisa sobre o uso do Bacillus Licheniformis HA1 para acelerar a compostagem de resíduos orgânicos, observaram que sua utilização evitou a queda de pH no estágio inicial e, assim, estimulou a proliferação de outros microrganismos termófilos, que contribuíram para o aumento da decomposição da ...…”

“…Song et al (2018a) pesquisando o impacto do consórcio microbiano anti-acidificação, no metabolismo de carboidratos de micróbios-chave, durante a compostagem de resíduos alimentares, concluíram que o consórcio microbiano anti-acidificação acelera a degradação de carboidratos, melhora a eficiência da compostagem e aumenta significativamente os tipos de enzimas que catalisam a degradação de lignina, celulose e hemicelulose. Song et al (2018b) estudando o efeito da inoculação, com um consórcio microbiano que degrada ácidos orgânicos, na eficiência da compostagem de restos de alimentos, concluíram que a utilização deste consórcio microbiano atua sinergicamente na degradação dos ácidos orgânicos, aumentando a eficiência da compostagem e encurtando o período de tempo.…”

Enhancement of Nutrients in Poultry Excreta through Formulated Microbial Consortium along with Bio Fertilizer Microorganisms

“…One of the important characteristics of waste composting is a decrease in pH in the premature stages of composting [77], because poultry excreta contain abundant and easily decomposable sugary substances, fatty materials, and grease. Degradation of these materials produces a large amount of intermediate acidic by-products, organic acids, which leads to the reduced pH of the composting substrate at the initial stage of waste composting [78], low pH values could lead to the slow down the rate of decomposition of organic matter, and thereby lower the efficiency of composting due to reduce the activity of microbes. pH of initial stage composts are slightly alkaline in this study (Fig.…”