A review of mixing, design and loading conditions in household anaerobic digesters

A.O. Jegede, G. Zeeman, H. Bruning

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Household digesters are anaerobic reactors applied mostly in rural areas of developing countries with tropical climate. The Chinese dome digester is the most popular household digester type in Asia and Africa, and has become the basis for contemporary developments in the household digester sector around the world. Household digesters are operated at ambient temperatures and have no internal mixing device, making them simple to operate. In the absence of internal mixing mechanism, the Chinese dome digester is mixed via pressure variation during gas production, gas use and feeding. Since mixing is limited in household digesters, they are operated at low organic loading rates and long hydraulic retention time when compared with forced mixed reactors. This review analyses and presents the various types of domestic biogas plants and operating parameters, with emphasis on mixing. Experimental results of household reactors, forced mixed reactors with different mixing modes and intensities were also reviewed and compared.

LanguageEnglish
Pages2117-2153
JournalCritical Reviews in Environmental Science and Technology
Volume49
Issue number22
DOIs
Publication statusPublished - 5 Jul 2019

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Domes
dome
Biogas
Gases
Developing countries
Hydraulics
household
digester
biogas
gas production
rural area
developing world
hydraulics
reactor
gas
Temperature
temperature

Keywords

  • Chinese dome digester (CDD)
  • household digesters
  • hydraulic retention time (HRT)
  • mixing

Cite this

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A review of mixing, design and loading conditions in household anaerobic digesters. / Jegede, A.O.; Zeeman, G.; Bruning, H.

In: Critical Reviews in Environmental Science and Technology, Vol. 49, No. 22, 05.07.2019, p. 2117-2153.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - Household digesters are anaerobic reactors applied mostly in rural areas of developing countries with tropical climate. The Chinese dome digester is the most popular household digester type in Asia and Africa, and has become the basis for contemporary developments in the household digester sector around the world. Household digesters are operated at ambient temperatures and have no internal mixing device, making them simple to operate. In the absence of internal mixing mechanism, the Chinese dome digester is mixed via pressure variation during gas production, gas use and feeding. Since mixing is limited in household digesters, they are operated at low organic loading rates and long hydraulic retention time when compared with forced mixed reactors. This review analyses and presents the various types of domestic biogas plants and operating parameters, with emphasis on mixing. Experimental results of household reactors, forced mixed reactors with different mixing modes and intensities were also reviewed and compared.

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