Performance of uasb reactor treating leachate from acidogenic fermenter in the two-phase anaerobic digestion of food waste

2001 ◽  
Vol 35 (14) ◽  
pp. 3441-3447 ◽  
Author(s):  
H.S Shin ◽  
S.K Han ◽  
Y.C Song ◽  
C.Y Lee
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Uasb Reactor ◽  
Two Phase

A hybrid two-phase system for anaerobic digestion of food waste

2002 ◽  
Vol 45 (12) ◽  
pp. 159-165 ◽  
Author(s):  
J.Y. Wang ◽  
H.L. Xu ◽  
J.H. Tay
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Batch Reactor ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Phase System ◽  
Bioreactor Landfills ◽  
Two Phase ◽  
Methanogenic Phase

A hybrid two-phase system, consisting of a solid waste reactor as the acidification reactor and a wastewater reactor, i.e. an upflow anaerobic sludge blanket (UASB) reactor, as the methanogenic reactor, for anaerobic digestion of food waste was investigated. After the pre-acidification stage, COD and total VFA removals in the methanogenic phase were in the ranges of 74-93% and 77-100%, respectively, while leachate COD and total VFA concentrations in the acidification phase decreased by 95% and 97-99%, respectively. Some 99% of the total CH4 generated was from the methanogenic phase with the CH4 content of 68-70%. About 77-79% of TOC, 57-60% of volatile solids and 79-80% of total COD were removed. The results of this laboratory-scale study show that the hybrid two-phase anaerobic batch reactor system is suitable for effective conversion of food waste into CH4 and CO2. The hybrid two-phase system can be further developed into an effective and efficient way to enhance waste stabilization in operating bioreactor landfills.

Semi-continuous anaerobic digestion of food waste using a hybrid anaerobic solid-liquid bioreactor

2003 ◽  
Vol 48 (4) ◽  
pp. 169-174 ◽  
Author(s):  
J.-Y. Wang ◽  
H.-L. Xu ◽  
H. Zhang ◽  
J.-H. Tay
Keyword(s):  
Anaerobic Digestion ◽  
Solid Waste ◽  
Food Waste ◽  
Biogas Production ◽  
Continuous Operation ◽  
Methane Content ◽  
High Rate ◽  
Uasb Reactor ◽  
Two Phase ◽  
Solid Liquid

A hybrid anaerobic solid-liquid (HASL) bioreactor was developed to enhance food waste conversion. The HASL bioreactor is a modified two-phase anaerobic digestion system with a solid waste reactor and a high-rate anaerobic wastewater reactor, which was a UASB reactor. In this study, the methanogenesis in the UASB reactor was investigated under a semi-continuous operation of the food waste digestion system. The HASL process, including 7 days of start-up and 23 days of semi-continuous operation followed by 6 days of batch operation, was commenced by loading 2.8 kg of shredded food waste. During the semi-continuous operation, 0.2 kg of the same waste was loaded daily. The leachate from acidification phase, i.e., solid waste reactor, remained acidic (pH 4.9-5.5) and high in total VFA (TVFA), 9,500-11,500 mg/L, and COD (8,000-11,800 mg/L) levels. In the methanogenesis phase, i.e., UASB reactor, effective TVFA and COD removals (88 ± 5% and 85 ± 7%, respectively) were obtained, while the methane content was 71%. At the end of operation, about 78% of VS added in the HASL bioreactor was removed, while TOC and total COD reductions were 78% and 79%, respectively. The results showed that the use of UASB reactor in the semi-continuous HASL system can enhance the methanogenesis process and increase the methane content in biogas production.

pH regulation of the first phase could enhance the energy recovery from two‐phase anaerobic digestion of food waste

2021 ◽  
Author(s):  
Qing Zhao ◽  
Samuel Gyebi Arhin ◽  
Ziyi Yang ◽  
Haopeng Liu ◽  
Zongye Li ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Energy Recovery ◽  
Ph Regulation ◽  
Two Phase

Effect of liquid digestate recirculation on the ethanol-type two-phase semi-continuous anaerobic digestion system of food waste

2020 ◽  
Vol 313 ◽  
pp. 123534
Author(s):  
Xinxin Ma ◽  
Miao Yu ◽  
Min Yang ◽  
Shuang Zhang ◽  
Ming Gao ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Two Phase ◽  
Liquid Digestate

Two-Phase Mesophilic Anaerobic Co-Digestion of Food Waste and Sewage Sludge: Effect of Hydraulic Retention Time

2014 ◽  
Vol 852 ◽  
pp. 789-796 ◽  
Author(s):  
Guo Hua Wang ◽  
Lei Wang ◽  
Xue Jun Tan ◽  
Yi Xian Wang ◽  
Feng Wang
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Food Waste ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Two Phase ◽  
Acidogenic Reactor ◽  
In Series ◽  
The Impact

The impact of hydraulic retention time (HRT) on two-phase mesophilic (35°C) anaerobic co-digestion of food waste and sewage sludge was studied under mixing ratio of 1:1 on the TS basis. Laboratory-scale, two-phase anaerobic digestion systems were employed with each system consisting of an acidogenic reactor and a methanogenic reactor linked in series. For the acidogenic phase, an increase of volatile fatty acid (VFA) concentration was observed as HRT increased from 1d to 5d and the HRT of 5d was recommended for significantly higher VFA production and less propionate percentage, which could provide stable and favourable substrates for the methane reactor. Under acidogenic HRT of 5d, 20d was proved to be the optimum HRT for methanogenic phase with the methane content, methane production rate, methane yield and two-phase VS removal rate reached 71%, 0.7L/(L·d), 0.69L/gVSremoved and 64.7%, respectively. Results verified that the constraints of conventional anaerobic digestion for food waste or sewage sludge separately could be overcome by synergistic effect of co-digestion strategy and two-phase treatment.

scholarly journals The Single- and Two-Phase Anaerobic Digestion of Food Waste Effluent

2011 ◽  
Vol 2 (1) ◽  
pp. 87-92
Author(s):  
Jun-Kwon HwangBo ◽  
Jae-Gun Seo ◽  
Heui-Chul Yoon ◽  
Hyeon-Gun Park ◽  
Bo-Won Lee
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Two Phase
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