The effects of cleaning/disinfecting agents on biogas production in the anaerobic digestion of cow dung slurry
| Autor: | Oluwaseyi Omidiora, Gbolabo A. Ogunwande, Idris O. Nureni, Ademola I. Adeleye |
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| Rok vydání: | 2017 |
| Předmět: |
Livestock
Slaughter house 010501 environmental sciences Biology 01 natural sciences Bacteria Anaerobic Animal science Bioreactors Biogas Environmental Chemistry Animals Anaerobiosis Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Biogas production 0402 animal and dairy science Temperature 04 agricultural and veterinary sciences General Medicine 040201 dairy & animal science Manure Anaerobic digestion Agronomy Biofuels Slurry Cattle Digestion Total bacterial count Cow dung Methane |
| Zdroj: | Environmental technology. 39(14) |
| ISSN: | 1479-487X |
| Popis: | Cleaning/disinfecting agents (CDA) are compounds known to affect the growth of microbes and could have impacts on biogas production in a digester. In this study, three commonly used CDAs (harpic, hypo and izal) in livestock pens and slaughter houses were applied at different digestion stages and concentrations to cow dung (CD) slurry, with the aim of determining their effects on biogas production. Three application stages (early addition, late addition and graduated addition) were carried out for each CDA, and a CD treatment with no CDA applied was set up as the control. The results showed that application stage had different effects on the parameters of CD monitored during the digestion. Significant (p ≤ .05) effect was recorded on: temperature of izal + CD treatment, pH of harpic + CD and hypo + CD treatments, total bacterial count of hypo + CD and izal + CD treatments and biogas of harpic + CD, hypo + CD and izal + CD treatments. Early addition and increased concentration of hypo appeared toxic to anaerobic bacteria, whereas early addition of izal seemed not to affect their development. While early addition and increased concentration of harpic and hypo inhibited biogas production, the contrary was observed with izal. At the end of digestion, biogas yield (% of control) in the CDA + CD treatments ranged between 8% and 69.4% (harpic + CD), 5.4-23.5% (hypo + CD) and 16.1-52.5% (izal + CD). Among the CDAs used, hypo had the highest inhibitory effect on biogas production from CD slurry. The introduction of harpic at fourth week of digestion showed the least inhibitory effect. |
| Databáze: | OpenAIRE |
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