Organic neem compounds inhibit soft-rot fungal growth and improve the strength of anthracite bricks bound with collagen and lignin for use in iron foundry cupolas

D. J. Kelsey, C. Nieto-Delgado, F. S. Cannon, R. A. Brennan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Aims: To examine organic neem compounds for their effective growth inhibition of saprotrophic soft-rot fungi on anthracite bricks bound with collagen and lignin for use in iron foundry cupolas as an alternative fuel source. Methods and Results: Azadirachtin, crude neem oil (NO), and clarified neem oil extract (CNO) were combined with copper to inhibit the growth of the soft-rot fungus, Chaetomium globosum. A synergistic interaction was observed between CNO and a low dose of copper on nutrient media (two-factor anova with triplicate replication: P < 0·05). Interaction was confirmed on lab-scale collagen-lignin-anthracite briquettes by measuring their unconfined compressive (UC) strength. The effective collagen strength of the briquettes was enhanced by applying CNO to their surface prior to inoculation: the room temperature UC strength of the briquettes was 28 ± 4·6% greater when CNO (0·4 mg cm-2) was surface-applied, and was 43 ± 3·0% greater when CNO plus copper (0·14 μg cm-2) were surface-applied. Conclusion: Surface application of CNO and copper synergistically prevents fungal growth on bindered anthracite briquettes and increases their room temperature strength. Significance and Impact of the Study: This novel organic fungicidal treatment may increase the storage and performance of anthracite bricks in iron foundries, thereby saving 15-20% of the energy used in conventional coke production.

Original languageEnglish (US)
Pages (from-to)65-75
Number of pages11
JournalJournal of Applied Microbiology
Volume119
Issue number1
DOIs
StatePublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology

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