Journal
ENVIRONMENTAL TECHNOLOGY
Volume 39, Issue 14, Pages 1803-1813Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2017.1340346
Keywords
Cleaning; disinfecting agent; toxicity; inhibitory effect; bacteria; biogas yield; cow dung
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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.
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