Contribution of Biomethane from Different Substrate into Energy Sustainability and Greener Economy

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


The economic development depends on a large extent on energy. With the fast depletion of fossil fuels which has an impact on environmental degradation and the global climate change, the commercial production of biogas and other alternative energy gives a good drive for the development of the green/circular economy. The removal of CO2, H2S, and nitrogen gas from raw biogas is a necessary step before the gas can be injected in to the gas grid. The study aimed at using high temperature and pressure process as an alternative to conventional upgrading processes (water scrubbing, pressure swing adsorption, chemical and physical scrubbing) of biogas from substrates. The carbon/nitrogen (C/N) ratio of cow dung was found to be 21.12 and grass clippings to be 64.87. Laboratory experimental data from 500 ml batch anaerobic digester operating at a mesophilic temperature of 37 °C and pH of 7.7 was used. The presented process revealed that from a mixture of cow dung and grass clippings (ratio 25:35 g), a product purity of 91.3 mol% CH4 was attainable by combining absorption (using a mixture of methyl diethanolamine, water, and calcium hydroxide), flash separation, and internal heat recovery. The process captures CO2 in liquid form with a purity of 99.94 mol% as a by-product. The proposed hybrid process could serve as an alternative to conventional upgrading techniques due to its energy efficiency and environmentally friendly process of CO2 removal.

Original languageEnglish
Title of host publicationHandbook of Solid Waste Management
Subtitle of host publicationSustainability through Circular Economy
PublisherSpringer Nature
Number of pages15
ISBN (Electronic)9789811642302
ISBN (Print)9789811642296
Publication statusPublished - 1 Jan 2022


  • Absorption
  • Anaerobic co-digestion
  • Biogas upgrading
  • Mesophilic temperature
  • Renewable energy

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences


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