Vladimirs Kotelenecs

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Vilis Dubrovskis

Latvia University of Life Sciences and Technologies

Eduards Zabarovskis

Imants Plūme

Latvia University of Life Sciences and Technologies

Arvids Celms

ĒS

Ēriks Skripsts

Latvian Biomedical Research and Study Centre

Janis Jasko

Latvia University of Life Sciences and Technologies

A. Adamovičs

Latvia University of Life Sciences and Technologies

Indulis Straume

Latvia University of Life Sciences and Technologies

Valters Kazulis

Riga Technical University

J. Bartuševics

Latvia University of Life Sciences and Technologies

Cooperative Institutions

Latvia University of Life Sciences and Technologies

Riga Technical University

Latvian Biomedical Research and Study Centre

Mykolayiv National Agrarian University

SRI International

Menlo School

University of Washington

Linnaeus University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Anaerobic digestion of vegetable processing wastes with catalyst Metaferm and microelements.

Vilis Dubrovskis Vladimirs Kotelenecs Imants Plūme

biogas plants are working today in Latvia. There is a need to investigate the suitability of various biomasses for energy production. One of the ways for improving the biogas yield in Latvia conditions is adding biological catalysts and microelements. This paper shows results from anaerobic digestion of vegetable processing wastes using a new biological catalyst Metaferm and mix of microelements. The digestion process was investigated for biogas production in sixteen 0.75 l digesters, operated in batch mode at temperature 38 ± 1.0 oC. The average methane yield per unit of dry organic matter added (DOM) from digestion of cucumbers was 0.282 l·g DOM -1 with Metaferm 1 ml - 0.340 l·g DOM -1 and with MEL1 - 0.337 l·g DOM -1 . The average methane yield from digestion of cucumbers with Metaferm 1 ml- and ME5 was 0.322 l·g DOM -1 . The average methane yield from digestion of leftovers and tops of tomatoes was 0.158 l·g DOM -1 and with Metaferm 1 ml - 0.173 l·g DOM -1 . The average methane yield per unit of dry organic matter added from digestion of grass silage and MEL1 was 0.121 l·g DOM - 1 . All investigated vegetable wastes can be successfully cultivated for energy production under agro ecological conditions in Latvia. Addition of the catalyst Metaferm increased the methane yield.

Biogas

Digestion

Silage

Source

Cite

Citations (1)

INVESTIGATION OF BIOGAS PRODUCTION FROM RELATIVELY DRY BIOMASS

Vilis Dubrovskis Imants Plūme Vladimirs Kotelenecs Indulis Straume

Anaerobic treatment of relatively dry biomass ( W=30-55 %) has an advantage, compared to the traditionally used wet biomass, due to lowered expenses of the transportation of raw or finished materials. By the help of laboratory scale 5l digesters biogas production was investigated from different biomass in anaerobic fermentation in the batch process. Inoculum from cow manure finished fermentation process was added in each digester to facilitate the anaerobic fermentation process. The lowest average yield of biogas 185 l kgvos -1 was obtained from fresh sawdust. The methane yield (percentage of methane) obtained from different biomass was the following: fresh sawdust 83 l kg vsd -1 (45 %); old sawdust 91 l kg vsd -1 (46 %); broiler manure with sawdust litter 98 l kg vsd -1 (49 %); broiler manure with slaughterhouse waste 185 l kg vsd -1 (52 %); and grain mill wastes 132 l kg vsd -1 (50 %).

Sawdust

Biogas

Cow dung

Source

Cite

Citations (6)

TECHNOLOGIES FOR BIOGAS PRODUCTION IN AGRICULTURE OF LATVIA

Vilis Dubrovskis Eduards Zabarovskis Vladimirs Kotelenecs

of energy in Latvia is foreseen to be produced in 2020 from renewable resources. Fast development of biogas production, as most perspective, started in recent years. The Ministry of Economics of Latvia planned for 2011 quotas for producing 467 000 MWh electricity from biogas with increased tariffs. 58 new biogas plants will be built. The owners are mostly farmers, which have big farms and land. The proposed technologies and equipment suitable for the local conditions of Latvia are analysed. The advantages and disadvantages are presented, conclusions and proposals are elaborated.

Biogas

Christian ministry

Biogas Production

Renewable resource

Source

Cite

Citations (0)

BIOGAS PRODUCTION FROM FRESH MAIZE BIOMASS

Vilis Dubrovskis Imants Plūme J. Bartuševics Vladimirs Kotelenecs

There is a need to find acceptable energy crops for biogas production for the climatic and soil conditions in Latvia. The average annual dry matter yields from maize vary from 12 to 16 t·ha -1 under the climatic conditions in Latvia. Biogas yield from fresh maize biomass was investigated in dependence on the harvesting time of maize. The maize varieties Tango and Celido were harvested in September 8, September 20 and October 8. For biogas investigations 6 laboratory fermenters of 5 litres volume, operating in batch mode were used. Green maize biomass was mixed with water and animal manure for enhanced anaerobic treatment process. The biogas yield from biomass samples varies from 476 l·kg VOS -1 to 570 l·kg VOS -1 . There were not verifiable advantages in volumes of biogas between the samples harvested in different periods found. The average methane content was in the range from 49.6 % to 59.3 % in biogas from different samples of maize biomass.

Biogas

Biogas Production

Source

Cite

Citations (5)

Co-Digestion of Various Biomasses for Biogas Production

European Biomass Conference and Exhibition Proceedings (2013)

Vilis Dubrovskis Vladimirs Kotelenecs Arvids Celms Eduards Zabarovskis

Biogas Production

Biogas

Digestion

10.5071/21steubce2013-2dv.4.21

Cite

Citations (0)

Co-fermentation of Various Biomasses for Biogas Production

European Biomass Conference and Exhibition Proceedings (2012)

Vilis Dubrovskis Vladimirs Kotelenecs Arvids Celms Eduards Zabarovskis

Biogas Production

Biogas

10.5071/20theubce2012-2dv.3.17

Cite

Citations (0)

Anaerobic digestion of sewage sludge.

Vilis Dubrovskis Imants Plūme Vladimirs Kotelenecs Eduards Zabarovskis

Utilization of sewage sludge causes environmental problems in Latvia, therefore anaerobic digestion of sludge was investigated as the treatment method. Sludge from the wastewater plant „Jurmala” was processed at temperature 38 C ± 1.0 C in laboratory bioreactors operating in batch mode. The investigated differences between total solids and organic solids contents were 2.0 % for fresh sludge, 2.1 % for old sludge, 3.6 % for sludge stored for a long period and 4.2 % for sludge from a ditch overgrown with vegetation in the wastewater treatment plant „Jurmala”. The average biogas yield obtained from the sludge samples was varying from 233 l·kgVSd -1 for sludge from the ditch overgrown by vegetation to 397 l·kgVSd -1 for fresh sludge. The average methane yield from fresh sludge was 233 l·kgVSd -1 and average methane yield from long time stored sludge was 122 l·kgVSd . The investigated average methane content was 59.0 % in biogas from fresh sludge, and the methane content was 46.1 % in biogas from sludge located for a long storage period. Co-digestion of sludge stored for years with fresh sludge or with agricultural biomass is recommended to increase the methane content in biogas.

Sewage sludge

Biogas

Sludge bulking

Ditch

Source

Cite

Citations (2)

Biogas yield from aerobic hydrolysis using biogas plant digestate.

Vilis Dubrovskis Vladimirs Kotelenecs

To find out how full the conversion rate of biomass for biogas production process is if aerobic hydrolysis in anaerobic digestion technology is used, a study was conducted using laboratory equipment. 6 bioreactors were filling a batch mode at 40 oC fermented digestate, which was taken from normal functioning of the biogas production plant. The same digestate was fermented and another 5 bioreactors at 18 oC temperature. On average, 40 days fermentation at 40 oC were obtained even 242 l·kgdom -1 biogas (119 l·kgdom -1 methane) and at 18 oC – 43 l·kgdom -1 biogas (9 l·kgdom -1 methane). The study shows that the digestate is still possible to gain a significant amount of methane and appropriate to provide a heated post digester not only cover the lagoon.

Digestate

Biogas

Source

Cite

Citations (0)

Biogas production potential from agricultural residues in Latvia.

Vilis Dubrovskis Vladimirs Kotelenecs Eduards Zabarovskis Arvids Celms Imants Plūme

It is needed to evaluate the biogas and energy potential from different biomass, including manure, wastewater sludge, energy plants, and food and biofuel processing waste in Latvia. Biogas output from different biomass was investigated in laboratory scale digesters operated at 38 oC. Biomass mixed with inoculums (fermented cow manure) was investigated for biogas production in fifteen digesters, operated in batch mode at temperature 38 ± 1.0 oC. Average methane yield per unit of dry organic matter added (dom) from ryegrass silage was 316 l·kg dom -1 and average methane (CH 4) content was 58.36 %. Average methane yield from oat middlings was 244 l·kg dom -1 and average methane content was 60.72 %. Average methane yield from jam was 728 l·kg dom -1 and average methane content was 62.77 %. All investigated biomass can be successfully cultivated for energy production in Latvia.

Biogas

Silage

Cow dung

Source

Cite

Citations (1)

BIOGAS PRODUCTION FROM GREATER BURDOCK, LARGELEAF LUPIN AND SOSNOVSKY COW PARSNIP

Vilis Dubrovskis A. Adamovičs Imants Plūme Vladimirs Kotelenecs Eduards Zabarovskis

There is a need to find acceptable crops for energy production for the climatic and soil conditions in Latvia. Greater burdock (Arctium lappa L ) and largeleaf lupin (Lupinus polyphyllus L.) are growing in Latvia for years. Sosnovsky cow parsnip (Heracleum sosnowskyi MANDEN .) was introduced around 50 years ago as the fodder crop, but it was labelled as an invading plant spreading over 10 230 ha in Latvia in 2010. Green fresh plant biomass was investigated for biogas production in six 5 l digesters operated in batch mode at temperature 38 oC. Average biogas yield 480 l·kg vos -1 , 520 l·kg vos -1 or 296 lkg vos -1 was obtained from greater burdock, largeleaf lupin or sosnovsky cow parsnip biomass respectively. The estimated average energy potential per unit of area is 87 GJ . ha -1 or 82 GJ . ha -1 for greater burdock or largeleaf lupin biomass cultivated on not used agricultural land area respectively, and energy potential is 38 GJ . ha -1 for sosnovsky cow parsnip during its elimination period.

Fodder

Biogas

Arctium lappa

Biogas Production

Source

Cite

Citations (5)