Anaerobic Leaching-Bed Reactor Treating Food Waste for Organic Acid Production: Effect of Bulking Agent

2015 ◽  
Vol 768 ◽  
pp. 289-298 ◽  
Author(s):  
Yong Han ◽  
Yong Jun Hao ◽  
Lei Zhang ◽  
Zhi Kun Zhang ◽  
Ai Min Li
Keyword(s):  
Fatty Acid ◽  
Food Waste ◽  
Volatile Fatty Acid ◽  
Organic Waste ◽  
Ph Control ◽  
Bulking Agent ◽  
Special Focus ◽  
Adhesive Properties ◽  
Organic Acid Production ◽  
Good Adhesive

Food waste was a troublesome organic waste stream, but a highly desirable substrate for anaerobic digestion to recover energy. Among the diverse reactor configurations, the leaching-bed reactor was reported to be best choice to treating the particular organic waste for platform compounds (volatile fatty acid). In this study, we carried out a series of experiments to investigate the bulking agent and pH control on process performance, and special focus was put on the biodegradability of bulking agent. The supplement of bulking agent greatly improved the leaching rate by 3.6 folds. Although the hydrolytic and acidogenic bacteria were resistant to low pH, the pH control (neutralization) caused a significantly increased volatile fatty acid (VFA) productions from 39.1 g COD/kg VSaddedto 183.4 g VFA/kg VSadded. Comparing with the undegradable bulking agent, the case with supplementing corncob as a bulking agent showed superior VFA yields (225 g COD/kg VSadded) which could be ascribed to the good adhesive properties for microorganisms and biodegradability. The ultimate analysis of the substrate (excluding the bulking agent) also showed that most of food waste was degraded with relative short reaction time. In addition, the TG/DTA and FTIR of residual corncob results indicated some components (cellulose, hemi-cellulose) were degraded, which could contribute to the additional VFA production (14 g COD/kg VSadded). This study suggested that the corncob could be considered as a good bio-compatible bulking agent for leaching-bed reactor, which not only increased the VFA productivity, but provided additional VFA production.

Enhancement of volatile fatty acid production using semi-continuous anaerobic food waste fermentation without pH control

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 103876-103883 ◽  
Author(s):  
Qinglian Wu ◽  
Wanqian Guo ◽  
Shanshan Yang ◽  
Haichao Luo ◽  
Simai Peng ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Food Waste ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Cost Effective ◽  
Ph Control ◽  
High Yield ◽  
Fatty Acid Production ◽  
Production Strategy

This study proposed a cost-effective and high-yield volatile fatty acid (VFA) production strategy using anaerobic food waste (FW) fermentation without pH control, which could be recommended for practical scale VFA production and FW treatment.

Effect of enzymatic pretreatment on solubilization and volatile fatty acid production in fermentation of food waste

2005 ◽  
Vol 52 (10-11) ◽  
pp. 51-59 ◽  
Author(s):  
H.J. Kim ◽  
Y.G. Choi ◽  
G.D. Kim ◽  
S.H. Kim ◽  
T.H. Chung
Keyword(s):  
Fatty Acid ◽  
Food Waste ◽  
Volatile Fatty Acid ◽  
Biological Nutrient Removal ◽  
High Concentration ◽  
Acid Fermentation ◽  
Mixture Ratio ◽  
Enzymatic Pretreatment ◽  
Enzyme Mixture ◽  
Enzyme Dosage

Food waste can be a valuable carbon source in biological nutrient removal (BNR) systems because of the high C/N and C/P ratio. However, pretreatment is necessary to promote hydrolysis of food waste because of the high concentration of volatile solids associated with organic matter. The influence of the enzymatic pretreatment on acid fermentation of food waste was investigated in this study. Solubilization of particulate matter in food waste was carried out using commercial enzymes. The acidification efficiency and the volatile fatty acid (VFA) production potential of enzymatically pretreated food waste were examined. The highest volatile suspended solid (VSS) reduction was obtained with an enzyme mixture ratio of 1: 2: 1 for carbohydrase: protease: lipase. An optimum enzyme dosage for solubilization of food waste was 0.1% (V/V) with the enzyme mixture ratio of 1: 2: 1. In the acid fermen- tation of enzymatically pretreated food waste, the maximum VFA production and the highest VFA fraction in soluble COD (SCOD) were also achieved at 0.1% (V/V) of total enzyme dosage. Increase in VFA production at this level of enzyme dosage was over 300% compared with the control fermenter. The major form of VFA produced by fermentation was n-butyrate followed by acetate.

Effects of salt and oil concentrations on volatile fatty acid generation in food waste fermentation

2017 ◽  
Vol 113 ◽  
pp. 1523-1528 ◽  
Author(s):  
Nuo Liu ◽  
Quan Wang ◽  
Jianguo Jiang ◽  
Haowei Zhang
Keyword(s):  
Fatty Acid ◽  
Food Waste ◽  
Volatile Fatty Acid ◽  
Acid Generation

scholarly journals Can salt-tolerant sludge mitigate the salt inhibition to acidogenic fermentation of food waste? Insight into volatile fatty acid production microbial community

2021 ◽  
Author(s):  
Jun Yin ◽  
Xiaozheng He ◽  
Ting Chen
Keyword(s):  
Salt Stress ◽  
Fatty Acid ◽  
Microbial Community ◽  
Food Waste ◽  
Acid Production ◽  
Biological Treatment ◽  
Volatile Fatty Acid ◽  
Salt Tolerant ◽  
Fatty Acid Production ◽  
Acidogenic Fermentation

Abstract For treatment of saline wastewater, the feasible approach to mitigate the salt inhibition is using the acclimated salt-tolerant sludge. The aim of this work was to verify if the use of the acclimated sludge (AS) also could alleviate salinity stress on acidogenic fermentation of food waste (FW) under saline environment. The responses of volatile fatty acid (VFA) production and the microbial community to salt stress were investigated. Results showed that VFA production was reduced by high salinity (30 g/L and 70 g/L NaCl) compared with the control (0 g/L NaCl), especially for groups inoculated with the AS, whereas inoculating with the non-acclimated sludge (non-AS) caused less reduction. The impact of salinity was seen on VFA production with accumulation of more propionic acid and acetic acid along with traces of butyric acid. Significant shift on microbial community composition occurred upon biomass exposure to salt. The microbial communities of the non-AS and AS groups at the same NaCl concentrations converged over time. The non-AS groups contained a more proportion of the phyla Bacteroidetes, Atribacteria and Chloroflexi at high salt levels. These findings demonstrate that the non-AS was more conducive to VFA production due to the presence of higher proportions of hydrolytic and fermenting bacteria.Statement of NoveltyAlthough anaerobic digestion (AD) would be the most cost‐effective and sustainable technology, the salinity is considered to be inhibitory to anaerobic biological treatment processes. The recent applications of salt‐tolerant cultures for the treatment of saline wastewaters suggest that biological treatment is promising. Previous studies also reported that acidogenic fermentation as the first step of AD process is inhibited under saline conditions. However, no study to date has focused on acidogenic fermentation for volatile fatty acid production from food waste using salt-tolerant sludge. Therefore, there is a need for improved understanding of high salt stress to resource recovery from organic wastes. This understanding can help in the design of an operating strategy to alleviate the inhibition of waste treatment by salinity.

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