Anaerobic Digestion of Cheese Whey, Poultry Waste and Cattle Dung – A Study of the Use of Mixture of Adsorbents and/or Surfactants to Improve Digester Performance

1994 ◽  
Vol 5 (4) ◽  
pp. 379-385
Author(s):  
Manik Desai ◽  
Datta Madamwar
Keyword(s):  
Anaerobic Digestion ◽  
Silica Gel ◽  
Cheese Whey ◽  
Gas Production ◽  
Cattle Dung ◽  
Process Performance ◽  
Poultry Waste ◽  
Maximum Enhancement ◽  
Anaerobic Digestion Process ◽  
Digestion Process

This paper describes the improvement of anaerobic digestion process due to the addition of various surfactants and adsorbents in different combinations. Among the different combinations tested mixture of silica gel (2000 mg litre–1) and sodium lauryl sulphate (300 mg litre–1) showed maximum enhancement in gas production as well as methane content indicating better process performance.

A Mathematical Model for the Anaerobic Digestion Process Applied to a Mixture of Night Soil and Septic Tank Sludge

1986 ◽  
Vol 18 (7-8) ◽  
pp. 239-248 ◽  
Author(s):  
Sung Ryong Ha ◽  
Dwang Ho Lee ◽  
Sang Eun Lee
Keyword(s):  
Mathematical Model ◽  
Anaerobic Digestion ◽  
Biomass Concentration ◽  
Gas Production ◽  
Septic Tank ◽  
Volatile Acid ◽  
Hydraulic Residence Time ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Proposed Model

Laboratory scale experiments were conducted to develop a mathematical model for the anaerobic digestion of a mixture of night soil and septic tank sludge. The optimum mixing ratio by volume between night soil and septic tank sludge was found to be 7:3. Due to the high solids content in the influent waste, mixed-liquor volatile suspended solids (MLVSS) was not considered to be a proper parameter for biomass concentration, therefore, the active biomass concentration was estimated based on deoxyribonucleic acid (DNA) concentration in the reactor. The weight ratio between acidogenic bacteria and methanogenic bacteria in the mixed culture of a well-operated anaerobic digester was approximately 3:2. The proposed model indicates that the amount of volatile acid produced and the gas production rate can be expressed as a function of hydraulic residence time (HRT). The kinetic constants of the two phases of the anaerobic digestion process were determined, and a computer was used to simulate results using the proposed model for the various operating parameters, such as BOD5 and volatile acid concentrations in effluent, biomass concentrations and gas production rates. These were consistent with the experimental data.

Highly Efficient Anaerobic Digestion with Thermal Pretreatment

1985 ◽  
Vol 17 (4-5) ◽  
pp. 529-539 ◽  
Author(s):  
M. Hiraoka ◽  
N. Takeda ◽  
S. Sakai ◽  
A. Yasuda
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Pilot Plant ◽  
Molecular Size ◽  
Gas Production ◽  
Thermal Pretreatment ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Before And After ◽  
Pilot Plant Study

The effectiveness of an anaerobic digestion process with thermal pretreatment at a comparatively low temperature was examined. The waste activated sludge was thermally pretreated in the process. A laboratory scale experiment and a pilot plant study were conducted. Changes in volatile acids concentration, in major constituents of sludge and in molecular size distribution were examined before and after thermal pretreatment and anaerobic digestion. Thermal pretreatment resulted in an increase of more than 30 percent in digestion gas production. The major substrates decomposed were fats in the pilot plant study. Glyceride fatty acids are decomposed with thermal pretreatment and produce volatile acids such as acetic and propionic acids. The volatile acids are directly utilized by anaerobes to produce methane. Organic matter such as fats and carbohydrates are depolymerized with thermal pretreatment and produce soluble intermediate compounds such as higher fatty acids. The intermediates are utilized in the anaerobic digestion process. These two major effects facilitate the methane production process.

Upgrading of Anaerobic Digestion Processes for Night Soil

1986 ◽  
Vol 18 (7-8) ◽  
pp. 249-256 ◽  
Author(s):  
T. Noike ◽  
J. Matsumoto
Keyword(s):  
Anaerobic Digestion ◽  
Removal Rate ◽  
Field Investigation ◽  
Gas Production ◽  
Cod Removal ◽  
Two Phase ◽  
Anaerobic Digesters ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Cod Removal Rate

The upgrading of night soil anaerobic digestion processes was studied by field investigation of the performance of anaerobic digesters in existing night soil treatment plants and by serai-continuous experiments with bench-scale digesters. Both the average monthly amount of collected night soil fed to a digester and the concentration of volatile solids in night soil increased in winter. A good correlation was found to exist between gas production and digestion temperature. The COD removal rate in the first digester was markedly higher than that in the second digester. The stirring period in the first digester in one plant differs from that in the other plant. Stirring the first digester for too long a period reduces the rate of COD removal by the second digester in the two-stage anaerobic digestion process. The first digester should be stirred for more than one hour per day in order to promote gas production. Gas production and CODCr removal rate in the second digester were hardly affected by reductions in retention time ranging from 15 days to 5 days. As night soil contains a large amount of cellulose and other refractory organics, some kind of pretreatment of the night soil fed to the digester may be necessary for the promotion of acidogenesis in the two-phase anaerobic digestion process.

Zeolite and swine inoculum effect on poultry manure biomethanation

2013 ◽  
Vol 27 (2) ◽  
pp. 169-173 ◽  
Author(s):  
P.G. Kougias ◽  
I.A. Fotidis ◽  
I.D. Zaganas ◽  
T.A. Kotsopoulos ◽  
G.G. Martzopoulos
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Natural Zeolite ◽  
Swine Manure ◽  
Poultry Manure ◽  
Ammonia Toxicity ◽  
Poultry Waste ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Inoculum Effect

Abstract Poultry manure is an ammonia-rich substrate that inhibits methanogenesis, causing severe problems to the anaerobic digestion process. In this study, the effect of different natural zeolite concentrations on the mesophilic anaerobic digestion of poultry waste inoculated with well-digested swine manure was investigated. A significant increase in methane production was observed in treatments where zeolite was added, compared to the treatment without zeolite.Methane production in the treatment with 10 g dm-3 of natural zeolite was found to be 109.75% higher compared to the treatment without zeolite addition. The results appear to be influenced by the addition of zeolite, which reduces ammonia toxicity in anaerobic digestion and by the ammonia-tolerant swine inoculum.

scholarly journals Influence of temperature and water to poultry waste ratio on methane production from anaerobic digestion

2018 ◽  
Vol 7 (3.11) ◽  
pp. 254
Author(s):  
Hazwani Hasmi ◽  
Faieza Buyong
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Operating Temperature ◽  
Poultry Waste ◽  
Influence Of Temperature ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Cumulative Amount ◽  
Different Temperatures ◽  
Mesophilic Temperature

The operating temperature and water to poultry waste ratio in anaerobic digestion process are among the factors that affect methane production. Therefore, this paper aimed to investigate the influence of temperature and water to poultry waste ratio on anaerobic digestion of poultry waste. In this study, three different temperatures were used; psychrophilic (25 °C), mesophilic (35 °C) and thermophilic (55 °C), while two different water to poultry waste ratio were examined; 1: 1 and 2: 1 (water: poultry waste). The methane production was the highest at mesophilic temperature followed by psychrophilic and thermophilic temperature with cumulative amount of methane at 14.99 x 10-3 L, 0.62 x 10-3 L and 0.22 x 10-3 L respectively. The highest methane production was observed at the water to poultry waste ratio of 2: 1 followed by ratio 1: 1 with cumulative amount of methane production at 0.11 x 10-3 L and 0.05 x 10-3 L.  

Sign in / Sign up

Export Citation Format

Share Document