Enhancing waste decomposition and methane production in simulated landfill using combined anaerobic reactors

2006 ◽  
Vol 53 (8) ◽  
pp. 243-251 ◽  
Author(s):  
N. Sanphoti ◽  
S. Towprayoon ◽  
P. Chaiprasert ◽  
A. Nopharatana
Keyword(s):  
Methane Production ◽  
Buffer Capacity ◽  
High Strength ◽  
Organic Content ◽  
Bioreactor Landfill ◽  
Anaerobic Reactor ◽  
Anaerobic Reactors ◽  
Fixed Film ◽  
Simulated Landfill ◽  
High Organic Content

The design of leachate recirculation to enhance municipal solid waste decomposition, methane production and microbial activities was taken into account in this study by using the combined anaerobic reactors of a simulated high organic content landfill reactor and a stabilized fixed film anaerobic reactor. The latter aimed to treat high strength leachate from the simulated landfill reactor before recirculation back to the former reactor. The results showed the possibility to apply this technique to high organic waste landfill where rapid and accumulative acids formed in the leachate were removed and treated by a fixed film anaerobic reactor. In addition, the treated leachate when circulated back to the simulated bioreactor landfill helps accelerate waste decomposition and methane production by providing buffer capacity as well as diluting organic content in the leachate to achieve the favourable conditions for acidogen and methanogen, respectively, to rapidly enter into the methanogenesis phase.

Performances of Charcoal Chip and Sand Packed Anaerobic Reactors

1989 ◽  
Vol 21 (12) ◽  
pp. 1677-1680
Author(s):  
Kee Kean Chin
Keyword(s):  
Shock Loading ◽  
High Strength ◽  
Gas Production ◽  
Organic Loading Rate ◽  
Equivalent Diameter ◽  
Treatment Efficiency ◽  
High Concentration ◽  
Oil Refineries ◽  
Anaerobic Reactors ◽  
Fixed Film

Performances of anaerobic fixed film reactors were studied using 200 litre field units packed with 20 mm equivalent diameter charcoal chips and 7 litre laboratory units packed with charcoal chips and 0.35 mm sand particles. Wastewaters from edible oil refineries were used as feed. Treatment efficiency was greater than 80% at organic loading rate of 7 kg COD/m3-d and 60% at 12 kg COD/m3-d. The systems were able to withstand a shock loading of over 22 kg COD/m3-d. Efficiency dropped when wastewaters contained a high concentration level of SO4− and Na+. Gas production rate was in general greater than 0.26 m3/kg COD removed of which 80% by volume was methane gas. The fixed film anaerobic reactors were shown to be effective in treating high strength organic wastewaters.

Vacuum Operation for Overloaded Anaerobic Treatment Systems

1989 ◽  
Vol 21 (4-5) ◽  
pp. 87-95
Author(s):  
J. De Santis ◽  
A. A. Friedman
Keyword(s):  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Anaerobic Treatment ◽  
Optimum Operating ◽  
Operating Pressure ◽  
Simple Modification ◽  
Anaerobic Reactors ◽  
Fixed Film ◽  
Solids Retention ◽  
High Concentrations

Overloaded anaerobic treatment systems are characterized by high concentrations of volatile fatty acids and molecular hydrogen and poor conversion of primary substrates to methane. Previous experiments with fixed–film reactors indicated that operation with reduced headspace pressures enhanced anaerobic treatment. For these studies, four suspended culture, anaerobic reactors were operated with headspace pressures maintained between 0.5 and 1.0 atm and a solids retention time of 15 days. For lightly loaded systems (0.4 g SCOD/g VSS-day) vacuum operation provided minor treatment improvements. For shock organic loads, vacuum operation proved to be more stable and to support quicker recovery from upset conditions. Based on these studies and a companion set of bioassay tests, it was concluded that: (a) a loading rate of about 1.0 g SCOD/g VSS-day represents a practical loading limit for successful anaerobic treatment, (b) a headspace pressure of approximately 0.75 atm appears to be an optimum operating pressure for anaerobic systems and (c) simple modification to existing systems may provide relief for organically overloaded systems.

scholarly journals Uranium-series isotopes from Eemian lake deposits, Hollerup, Denmark

1998 ◽  
Vol 44 ◽  
pp. 173-179
Author(s):  
C. Israelson ◽  
S. Bjorck ◽  
N. Noe Nygaard ◽  
C. J. Hawkesworth
Keyword(s):  
Ground Water ◽  
Lake Sediments ◽  
Sedimentary Facies ◽  
Organic Content ◽  
Time Interval ◽  
Decay Products ◽  
Large Spread ◽  
Isotope Study ◽  
Lake Deposits ◽  
High Organic Content

We report the results of a U-series isotope study on Eemian lake sediments from Hollerup, western Denmark. The purpose is to examine the possibility of dating these, and similar, sediments with the 238U-23"h method. Two sedimentary facies were studied; carbonate-present, and virtually carbonate-free but organic-rich sediments. All carbonate-present sediments (5-95%) have (230ThP38U) values higher than unity and relatively radiogenic (23"W232Th) values between 2 and 6.5, indicating postdeposition removal of U, probably by percolation of ground water. Carbonate-free sediments, but with high organic content (40-60%) had (230Th/238U) values lower than 1 and 'model ages' between 89 and 199 ky. The large spread in ages and variation in U content for these sediment samples that were deposited over a much shorter time interval, indicate a complex postdepositional migration pattern of U, probably involving several episodes of leaching and absorption of U from ground water. Our results suggest that lake sediments, such as those found in Hollerup, are vulnerable to mobilization of U and its decay products and care should be taken when interpreting U-series disequilibrium data from such sediments. Future studies will concentrate on sediments that have been more deeply buried andor are less compacted and sealed from percolation of oxidized groundwater.

scholarly journals Sosialisasi Pengelolaan Limbah Dapur Serta Program 3R (Reuse, Reduce, Recycle) Bagi Pemilik Rumah Makan dan Jasa Boga di Wilayah Kota Tasikmalaya

2018 ◽  
Vol 1 (2) ◽  
pp. 53-62
Author(s):  
Melly Mellyanawaty ◽  
Estin Nofiyanti ◽  
A Ibrahim ◽  
N Salman ◽  
N Nurjanah ◽  
...  
Keyword(s):  
Solid Waste ◽  
Energy Requirement ◽  
Organic Content ◽  
Limited Area ◽  
Solid Waste Disposal ◽  
Kitchen Waste ◽  
Egg Shells ◽  
Cooked Food ◽  
Pre Treatment ◽  
High Organic Content

Society services activity in kitchen waste management system has been implemented to the owner of restaurant and catering work in Tasikmalaya City area. This activity has colaborated with Indonesian Catering Associations (APJI). The rapid growth of restaurant and catering activities has created serious problems of energy requirement, water, and solid waste disposal. Less information and limited area become the problems in handling of kitchen waste. A simple technique is needed to overcome the environmental problem which is caused by kitchen waste. The components of kitchen waste include vegetables, peelings, fruit skins, spoilt fruit, cooked and uncooked meat, bones, fats, egg-shells, bread and pastries, cooked food waste, etc. Due to a high organic content, bioconversion technologies such as anaerobic digestion are more suitable to handle the waste convert to biogas. It would be reducing the LPG usage. For the kitchen wastewater, grease trap as pre-treatment followed by a physical and biological process is one of a simple process which can produce the effluent in accordance with government standard. The activities were continued by the socialization of 3R program (reuse, reduce, recycle) by doing demo utilization of kitchen solid waste such as packing material, mineral water bottle is made a handicraft. Knowledge transfer run well and the enthusiasm of the participants in following the activity were very good.

Erosion resistance and behaviour of highly organic in-sewer sediment

2013 ◽  
Vol 69 (3) ◽  
pp. 672-679 ◽  
Author(s):  
I. Seco ◽  
M. Gómez Valentín ◽  
A. Schellart ◽  
S. Tait
Keyword(s):  
Organic Content ◽  
Natural Environments ◽  
Time Varying ◽  
Storm Events ◽  
Dry Period ◽  
Sewer Systems ◽  
Organic Sediment ◽  
Combined Sewer ◽  
Tank Design ◽  
High Organic Content

Reliable prediction of time-varying pollutant loads in combined sewer systems during storm periods can aid better management of the release of pollution into natural environments as well as enhancing storage tank design. Better understanding of the behaviour of sewer sediments is crucial for the development of models that adequately describe the transport of in-sewer solids and accurately predict the changes in pollutant concentration within combined sewers during storm events. This paper reports on the results of a test programme to examine the erosion of highly organic sewer sediment under the application of time-varying shear stress. The tests were carried out with and without supplying oxygen, and varying simulated dry-weather periods. The aim was to investigate the behaviour of real in-sewer sediment with a high organic content (around 80%) in an attempt to improve prediction of the transport rates under the particular Mediterranean conditions of long dry-period/build-up and intense rainfall/wash-off, and understand how this environment affects the erosional resistance and subsequent sediment release. Results have been compared with previous work on lower organic content sewer sediments and artificial organic sediment.

Anaerobic digestion of macroalgae: methane potentials, pre-treatment, inhibition and co-digestion

2011 ◽  
Vol 64 (8) ◽  
pp. 1723-1729 ◽  
Author(s):  
H. B. Nielsen ◽  
S. Heiske
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Organic Content ◽  
Saccharina Latissima ◽  
Green Tides ◽  
Volatile Solids ◽  
Continuously Stirred Tank Reactor ◽  
Pre Treatment ◽  
Centralized Biogas Plant ◽  
Chaetomorpha Linum

In the present study we tested four macroalgae species – harvested in Denmark – for their suitability of bioconversion to methane. In batch experiments (53 °C) methane yields varied from 132 ml g volatile solids−1 (VS) for Gracillaria vermiculophylla, 152 ml g VS−1 for Ulva lactuca, 166 ml g VS−1 for Chaetomorpha linum and 340 ml g VS−1 for Saccharina latissima following 34 days of incubation. With an organic content of 21.1% (1.5–2.8 times higher than the other algae) S. latissima seems very suitable for anaerobic digestion. However, the methane yields of U. lactuca, G. vermiculophylla and C. linum could be increased with 68%, 11% and 17%, respectively, by pretreatment with maceration. U. lactuca is often observed during ‘green tides’ in Europe and has a high cultivation potential at Nordic conditions. Therefore, U. lactuca was selected for further investigation and co-digested with cattle manure in a lab-scale continuously stirred tank reactor. A 48% increase in methane production rate of the reactor was observed when the concentration of U. lactuca in the feedstock was 40% (VS basis). Increasing the concentration to 50% had no further effect on the methane production, which limits the application of this algae at Danish centralized biogas plant.

Leachate properties as indicators of methane production process in MSW anaerobic digestion bioreactor landfill

2018 ◽  
Author(s):  
Yunmin Zeng ◽  
Li’ao Wang ◽  
Tengtun Xu ◽  
Jiaxiang Li ◽  
Xue Song ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Production Process ◽  
Methane Production ◽  
Bioreactor Landfill

scholarly journals Glycan-specific precipitation of glycopeptides in high organic content sample solvents used in HILIC

2020 ◽  
Vol 1150 ◽  
pp. 122196
Author(s):  
Petr Kozlik ◽  
Katarina Molnarova ◽  
Tomas Jecmen ◽  
Tomas Krizek ◽  
Radoslav Goldman
Keyword(s):  
Organic Content ◽  
High Organic Content
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