| Registro completo |
| Provedor de dados: |
Engenharia na Agricultura
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| País: |
Brazil
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| Título: |
EFFECTIVE MICROORGANISMS (EM) AS BIOFEEDERS FOR ANAEROBIC DIGESTION
EFFECTIVE MICROORGANISMS (EM) AS BIOFEEDERS FOR ANAEROBIC DIGESTION
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| Autores: |
Souza Ferreira, Cecília de Fátima
Gates, Richard Stephen
Batista, Maurílio Duarte
TINOCO, Ilda de Fatima Ferreira
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| Data: |
2017-12-21
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| Ano: |
2017
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| Palavras-chave: |
Construções Rurais e Ambiência animal production
Biogas
Cattle
Digesters
Waste management
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| Resumo: |
Soil micro-organisms called Effective Microorganisms (EM) were first cultivated and used in the 1970s. Researches about these cultures have since then demonstrated their effectiveness in improving soil characteristics and as an alternative for accelerating organic matter decomposition in waste treatment systems. The objective of this study was to test whether the addition of EM to substrates incubated in anaerobic digesters would increase the efficiency of waste treatment and biogas production. EM cultures were obtained from bacterial colonies captured within the A-horizon of a Brazilian forest soil. They were left to grow during 15 days on cooked rice contact with the soil; afterwards, the established colonies were separated according to their colors, discarding all shades of black, gray and white, according to recommendations from related literature. Remaining colonies were further grown in sugarcane broth medium for 18 days, being this the final EM culture. Twelve bench digesters were used, each with a total capacity for three liters. The experiment was composed by four treatments consisting of different concentrations of EM inoculum [15% (T1), 10% (T2), 1% (T3) and 0% (T4)] applied to dairy cattle manure, with three replications per treatment. Anaerobic digestion was carried out under controlled temperature (35oC) over 99 days. Data collected included concentrations of total, fixed and volatile solids (TS, FS and VS), pH and Chemical Oxygen Demand (COD). The pH of the EM inoculum was 3.34 and COD was 24.25 mg L-1. The best reduction efficiencies for COD and TS removal were 79.44% and 42.50%, respectively, in T4. Among the treatments with EM addition, 1% (T3) resulted in better COD reduction. The maximum accumulated biogas production was 20.60 L biogas L substrate-1, also for T3. In conclusion, EM as an inoculum in low concentrations may be advantageous to anaerobic digestion.
In the 1970's the Japanese horticulturist and researcher Dr. Teruo Higa initiated the use of a culture of microorganisms beneficial to soil, which he named "Effective Microorganisms" (EM). Research about this culture has demonstrated its effectiveness in improving soil characteristics, and also as an alternative means of accelerating organic matter decomposition in waste treatment systems. To test whether addition of EM inoculum to substrate in anaerobic digesters increases methane conversion efficiency, the objective of this study was to test the EM culture as inoculum, for its efficiency of waste treatment and biogas production. The culture of EM was obtained from colonies captured within the "A-horizon" of a soil in a Brazilian forest. They were grown in cooked rice in contact with the soil for 15 days, after which the established colonies were separated according to their colors, discarding all shades of black, gray and white, according the recommendation. The remaining colonies were further grown in a sugarcane broth medium for 18 days. Twelve bench digesters were used, with a total capacity of three liters each. Four treatments were applied, consisting of different additions of EM inoculum [mixture concentrations of 15% (T1), 10% (T2), 1% (T3) and 0% (T4)], to dairy cattle manure, with three replications per treatment. Anaerobic digestion was carried out under controlled temperature (35 oC). Data collected included concentrations of total, fixed and volatile solids (TS, FS and VS), pH and Chemical Oxygen Demand (COD). The pH of the EM inoculum was 3.34 and its COD was 24.25 mg L-1. The maximum accumulated biogas production was 20.60 L biogas L substrate-1 for T3 after 99 days, approximately. The efficiencies removing COD and TS were 79.44% and 42.50% respectively, for T4. It was concluded that use of EM in low concentrations as an inoculum may be advantageous to anaerobic digestion.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Português
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| Identificador: |
http://www.seer.ufv.br/seer/index.php/reveng/article/view/687
10.13083/reveng.v25i6.687
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| Editor: |
Universidade Federal de Viçosa - UFV
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| Relação: |
http://www.seer.ufv.br/seer/index.php/reveng/article/view/687/pdf
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| Formato: |
application/pdf
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| Fonte: |
REVISTA ENGENHARIA NA AGRICULTURA - REVENG; v. 25, n. 6 (2017): NOVEMBRO/DEZEMBRO; 491-499
2175-6813
1414-3984
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