A hybrid anaerobic solid–liquid system for food waste digestion

2005 ◽  
Vol 52 (1-2) ◽  
pp. 223-228 ◽  
Author(s):  
J.Y. Wang ◽  
H. Zhang ◽  
O. Stabnikova ◽  
S.S. Ang ◽  
J.H. Tay
Keyword(s):  
Food Waste ◽  
Methane Production ◽  
Anaerobic Treatment ◽  
Liquid System ◽  
Ammonia Removal ◽  
Total Removal ◽  
Two Phase ◽  
Satisfactory Performance ◽  
Volatile Solids ◽  
Solid Liquid

A hybrid anaerobic solid – liquid (HASL) system was developed to enhance food waste bioconversion in comparison with the conventional two-phase anaerobic digester. The advantages of the HASL system were the higher efficiency of methane production and smaller volume of effluent from the system. The biogas, which was generated from the methanogenic phase, had an average methane content of 71–72%. Total removal of volatile solids consisted of 78–80%. The HASL system can be operated in both batch and semi-continuous modes with satisfactory performance. The addition of a submerged biofilter for ammonia removal to the HASL system further enhanced the performance of anaerobic digestion. Methane production in the enhanced HASL system was increased by 26% in comparison with the HASL system without submerged filter. This paper describes the development of the enhanced HASL system for anaerobic treatment of food waste.

Enhancement of food waste digestion in the hybrid anaerobic solid-liquid system

2008 ◽  
Vol 57 (9) ◽  
pp. 1369-1373 ◽  
Author(s):  
X. Y. Liu ◽  
H. B. Ding ◽  
S. Sreeramachandran ◽  
O. Stabnikova ◽  
J. Y. Wang
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Waste Treatment ◽  
Liquid System ◽  
Net Energy ◽  
Two Phase ◽  
Treatment Processes ◽  
Pre Treatment ◽  
Solid Liquid ◽  
Net Energy Gain

The hybrid anaerobic solid-liquid (HASL) system is a modified two-phase anaerobic digester for food waste treatment. To enhance the performance of anaerobic digestion in the HASL system, thermal pre-treatment (heating at 150°C for 1 h) and freezing/thawing (freezing for 24 h at−20°C and then thawing for 12 h at 25°C) were proposed for food waste pre-treatment before the anaerobic digestion. Both processes were able to alter the characteristics and structure of food waste favoring substance solubilization, and hence production of methane. However, there was no net energy gain when the energy required by the pre-treatment processes was taken into account.

Facile Synthesis of Polysubstituted Cyclopropanes in a Two-Phase Solid-Liquid System

1992 ◽  
Vol 22 (12) ◽  
pp. 1651-1653 ◽  
Author(s):  
Yan Chaoguo ◽  
Kong Qiangzhi ◽  
Lu Wenxing ◽  
Wu Jitao
Keyword(s):  
Liquid System ◽  
Facile Synthesis ◽  
Two Phase ◽  
Solid Liquid

Digestion of frozen/thawed food waste in the hybrid anaerobic solid–liquid system

2008 ◽  
Vol 28 (9) ◽  
pp. 1654-1659 ◽  
Author(s):  
O. Stabnikova ◽  
X.Y. Liu ◽  
J.Y. Wang
Keyword(s):  
Food Waste ◽  
Liquid System ◽  
Solid Liquid

ChemInform Abstract: Facile Synthesis of Polysubstituted Cyclopropanes in a Two-Phase Solid- Liquid System.

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
C. YAN ◽  
Q. KONG ◽  
W. LU ◽  
J. WU
Keyword(s):  
Liquid System ◽  
Facile Synthesis ◽  
Two Phase ◽  
Solid Liquid

A comparative study of anaerobic digestion of food waste in a single pass, a leachate recycle and coupled solid/liquid reactors

2003 ◽  
Vol 47 (1) ◽  
pp. 319-324 ◽  
Author(s):  
H.L. Xu ◽  
J.Y. Wang ◽  
H. Zhang ◽  
J.H. Tay
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Methane Content ◽  
Anaerobic Sludge ◽  
Methane Fermentation ◽  
Two Phase ◽  
Single Pass ◽  
Digestion Process ◽  
Solid Liquid ◽  
Methanogenic Phase

A single pass reactor (R1), a leachate recycle reactor (R2) and a coupled solid/liquid bioreactor (R3-Rm) for anaerobic digestion of food waste were comparatively investigated in terms of digestion process and treatment efficiency. The coupled solid/liquid bioreactor is an enhanced two-phase system and distinctive from a traditional two-phase process with an upflow anaerobic sludge blanket (UASB) reactor as the methanogenic phase and a circulation of treated leachate between the acidification and methanogenic phases. In comparison with R1 and R2, R3-Rm enhanced the digestion process and increased the methane content of biogas. 100% of the R3-Rm methane yield was from the methanogenic phase with average methane content of 71%. The significant enhancement was also confirmed by the removal of 79% of total organic carbon (TOC), 60% of volatile solids (VS) and 80% of total COD in 12 days running of R3-Rm. However, no active methane fermentation was detected in R1 and R2 during 60 days operation. The results in this laboratory-scale study show that the rapid accumulation of volatile fatty acids (VFAs) due to the rapid acidification of food waste inhibits the development of effective methane fermentation in single pass and leachate recycle reactors. The coupled solid/liquid bioreactor is more efficient in converting food waste into methane and carbon dioxide.

Thermophilic anaerobic fermentation of olive pulp for hydrogen and methane production: modelling of the anaerobic digestion process

2006 ◽  
Vol 53 (8) ◽  
pp. 271-279 ◽  
Author(s):  
H.N. Gavala ◽  
I.V. Skiadas ◽  
B.K. Ahring ◽  
G. Lyberatos
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Anaerobic Fermentation ◽  
Anaerobic Treatment ◽  
Two Phase ◽  
Production Of Hydrogen ◽  
Subsequent Step ◽  
Methane Potential ◽  
Olive Pulp ◽  
Semi Solid

The present study investigates the thermophilic biohydrogen and methane production from olive pulp, which is the semi-solid residue coming from the two-phase processing of olives. It focussed on: a) production of methane from the raw olive pulp; b) anaerobic bio-production of hydrogen from the olive pulp; c) subsequent anaerobic treatment of the hydrogen-effluent with the simultaneous production of methane; and d) development of a mathematical model able to describe the anaerobic digestion of the olive pulp and the effluent of hydrogen producing process. Both continuous and batch experiments were performed. The hydrogen potential of the olive pulp amounted to 1.6 mmole H2 per g TS. The methane potential of the raw olive pulp and hydrogen-effluent was as high as 19 mmole CH4 per g TS suggesting that: a) olive pulp is a suitable substrate for methane production; and b) biohydrogen production can be very efficiently coupled with a subsequent step for methane production.

scholarly journals Acid and enyzymatic hyrolysis of Solarium tuberosum L. Glycoalkaloids: Comparison results

2006 ◽  
Vol 12 (4) ◽  
pp. 241-245 ◽  
Author(s):  
Nada Nikolic ◽  
Mihajlo Stankovic ◽  
Milorad Cakic
Keyword(s):  
Liquid Phase ◽  
Enzymatic Hydrolysis ◽  
Acid Hydrolysis ◽  
Liquid System ◽  
Two Phase ◽  
Comparison Results ◽  
Phase Liquid ◽  
Comparison Of The Results ◽  
Solid Liquid ◽  
Hydrolysis Of

A comparison of the results of the acid and enzymatic hydrolysis of GA from potato haulm and tuber sprouts is presented in this paper. Different systems were used for acid hydrolysis: monophase liquid, two-phase liquid-liquid or solid-liquid and three-phase solid-liquid-liquid systems. Enzymatic hydrolysis was carried out by enzymes present in fresh haulm and fresh tuber sprouts and the fresh juice obtained from fresh plant material. The procedure of acid hydrolysis of GA from potato sprouts in a two-phase liquid-liquid system was selected as the optimal procedure for obtaining solanidine. The liquid-liquid system was composed of GA extract with hydrochloric acid as the first liquid phase and chloroform as the second liquid phase. A degree of GA hydrolysis of 96% and a solanidine yield of 1.50 g per 100 g of dried tuber sprouts after 90 minutes were then achieved.

scholarly journals Thermodynamics of phase equilibrium in solid-liquid and solid-gas systems

2021 ◽  
Vol 83 (1) ◽  
pp. 30-35
Author(s):  
Y. I. Shishatskii ◽  
A. A. Derkanosova ◽  
S. A. Tolstov
Keyword(s):  
Driving Force ◽  
Cheese Whey ◽  
Extraction Process ◽  
Liquid System ◽  
Average Concentration ◽  
Phase System ◽  
Gibbs Equation ◽  
Two Phase ◽  
Thermodynamic Potentials ◽  
Solid Liquid

The thermodynamic equilibrium of a two-phase system is described by the Gibbs equation, which includes state parameters. On the basis of the Gibbs equation and the combined equation of the first and second laws of thermodynamics, thermodynamic potentials are written: internal energy, enthalpy and Gibbs free energy. If the two phases are in equilibrium, then the temperatures, pressures and chemical potentials of these phases are equal to each other. Equalities express the conditions of thermal and mechanical equilibrium, as well as the condition for the absence of a driving force for the transfer of a component across the interface. For a two-phase system, the Gibbs-Duhem equation connects the volume and entropy of 1 mole of the mixture, the content of any component, expressed in mole fractions. Extraction from lupine particles with cheese whey (solid-liquid system) is considered. The driving force of the extraction process in the solid-liquid system is the difference between the concentration of the solvent at the surface of the solid C and its average concentration C0 in the bulk of the solution. The concentration at the interface is usually taken to be equal to the concentration of a saturated solution of Cn, since equilibrium is established rather quickly near the surface of a solid. Then the driving force of the process is expressed as Cn – C0. A curve for the extraction of extractives from lupine with cheese whey was plotted by superimposing low-frequency mechanical vibrations.

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