Anaerobic digestion of pig manure with different agro-industrial wastes

Ming Hung WONG*, Y. H. Cheung

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

5 Citations (Scopus)


The present investigation studied the effectiveness of four types of agro-industrial wastes (cardboard, newspaper, sawdust and sugar-cane waste) as a carbon source in the batch anaerobic digestion of pig manure. Pig manure with either sawdust or cardboard, especially sawdust, produced higher total volumes of biogas than with newspaper or sugar-cane waste. Mixtures in the ratio 4:1 pig manure: sawdust, and 4:1 and 3:1 pig manure: cardboard gave the highest yields of gas with the highest percentage of methane. The total solids, volatile solids and chemical oxygen demand of the digested materials showed that the organic material of the wastes had been substantially decreased by digestion. The fertilizer values of the digested materials were tested by planting Lolium perenne (ryegrass) on sand amended with digested wastes. Pig manure with sugar-cane waste gave the highest crop yield, followed by manure plus cardboard or sawdust; pig manure with newspaper gave the lowest yield.

Original languageEnglish
Pages (from-to)143-155
Number of pages13
JournalBiological Wastes
Issue number2
Publication statusPublished - 1989

Scopus Subject Areas

  • Environmental Science(all)
  • Waste Management and Disposal
  • Pollution
  • Earth and Planetary Sciences(all)


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