Anaerobic digestion of municipal solid wastes containing variable proportions of waste types

Joseph C. Akunna, Y. A. Abdullahi, N. A. Stewart

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

In many parts of the world there are significant seasonal variations in the production of the main organic wastes, food and green wastes. These waste types display significant differences in their biodegradation rates. This study investigated the options for ensuring process stability during the start up and operation of thermophilic high-solids anaerobic digestion of feedstock composed of varying proportions of food and green wastes. The results show that high seed sludge to feedstock ratio (or low waste loading rate) is necessary for ensuring process pH stability without chemical addition. It was also found that the proportion of green wastes in the feedstock can be used to regulate process pH, particularly when operating at high waste loading rates (or low seed sludge to feedstock ratios). The need for chemical pH correction during start-up and digestion operation decreased with increase in green wastes content of the feedstock. Food wastes were found to be more readily biodegradable leading to higher solids reduction while green wastes brought about pH stability and higher digestate solid content. Combining both waste types in various proportions brought about feedstock with varying buffering capacity and digestion performance. Thus, careful selection of feedstock composition can minimise the need for chemical pH regulation as well as reducing the cost for digestate dewatering for final disposal.
Original languageEnglish
Pages (from-to)143–149
Number of pages7
JournalWater Science & Technology
Volume56
Issue number8
DOIs
StatePublished - 2007

Fingerprint

digestion
food
sludge
seed
dewatering
buffering
municipal solid waste
biodegradation
seasonal variation
cost

Cite this

Akunna, Joseph C.; Abdullahi, Y. A.; Stewart, N. A. / Anaerobic digestion of municipal solid wastes containing variable proportions of waste types.

In: Water Science & Technology, Vol. 56, No. 8, 2007, p. 143–149.

Research output: Contribution to journalArticle

@article{d29361b3521947d6b418df304473be5f,
title = "Anaerobic digestion of municipal solid wastes containing variable proportions of waste types",
abstract = "In many parts of the world there are significant seasonal variations in the production of the main organic wastes, food and green wastes. These waste types display significant differences in their biodegradation rates. This study investigated the options for ensuring process stability during the start up and operation of thermophilic high-solids anaerobic digestion of feedstock composed of varying proportions of food and green wastes. The results show that high seed sludge to feedstock ratio (or low waste loading rate) is necessary for ensuring process pH stability without chemical addition. It was also found that the proportion of green wastes in the feedstock can be used to regulate process pH, particularly when operating at high waste loading rates (or low seed sludge to feedstock ratios). The need for chemical pH correction during start-up and digestion operation decreased with increase in green wastes content of the feedstock. Food wastes were found to be more readily biodegradable leading to higher solids reduction while green wastes brought about pH stability and higher digestate solid content. Combining both waste types in various proportions brought about feedstock with varying buffering capacity and digestion performance. Thus, careful selection of feedstock composition can minimise the need for chemical pH regulation as well as reducing the cost for digestate dewatering for final disposal.",
author = "Akunna, {Joseph C.} and Abdullahi, {Y. A.} and Stewart, {N. A.}",
year = "2007",
doi = "10.2166/wst.2007.725",
volume = "56",
pages = "143–149",
journal = "Water Science & Technology",
issn = "0273-1223",
number = "8",

}

Anaerobic digestion of municipal solid wastes containing variable proportions of waste types. / Akunna, Joseph C.; Abdullahi, Y. A.; Stewart, N. A.

In: Water Science & Technology, Vol. 56, No. 8, 2007, p. 143–149.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Anaerobic digestion of municipal solid wastes containing variable proportions of waste types

AU - Akunna,Joseph C.

AU - Abdullahi,Y. A.

AU - Stewart,N. A.

PY - 2007

Y1 - 2007

N2 - In many parts of the world there are significant seasonal variations in the production of the main organic wastes, food and green wastes. These waste types display significant differences in their biodegradation rates. This study investigated the options for ensuring process stability during the start up and operation of thermophilic high-solids anaerobic digestion of feedstock composed of varying proportions of food and green wastes. The results show that high seed sludge to feedstock ratio (or low waste loading rate) is necessary for ensuring process pH stability without chemical addition. It was also found that the proportion of green wastes in the feedstock can be used to regulate process pH, particularly when operating at high waste loading rates (or low seed sludge to feedstock ratios). The need for chemical pH correction during start-up and digestion operation decreased with increase in green wastes content of the feedstock. Food wastes were found to be more readily biodegradable leading to higher solids reduction while green wastes brought about pH stability and higher digestate solid content. Combining both waste types in various proportions brought about feedstock with varying buffering capacity and digestion performance. Thus, careful selection of feedstock composition can minimise the need for chemical pH regulation as well as reducing the cost for digestate dewatering for final disposal.

AB - In many parts of the world there are significant seasonal variations in the production of the main organic wastes, food and green wastes. These waste types display significant differences in their biodegradation rates. This study investigated the options for ensuring process stability during the start up and operation of thermophilic high-solids anaerobic digestion of feedstock composed of varying proportions of food and green wastes. The results show that high seed sludge to feedstock ratio (or low waste loading rate) is necessary for ensuring process pH stability without chemical addition. It was also found that the proportion of green wastes in the feedstock can be used to regulate process pH, particularly when operating at high waste loading rates (or low seed sludge to feedstock ratios). The need for chemical pH correction during start-up and digestion operation decreased with increase in green wastes content of the feedstock. Food wastes were found to be more readily biodegradable leading to higher solids reduction while green wastes brought about pH stability and higher digestate solid content. Combining both waste types in various proportions brought about feedstock with varying buffering capacity and digestion performance. Thus, careful selection of feedstock composition can minimise the need for chemical pH regulation as well as reducing the cost for digestate dewatering for final disposal.

U2 - 10.2166/wst.2007.725

DO - 10.2166/wst.2007.725

M3 - Article

VL - 56

SP - 143

EP - 149

JO - Water Science & Technology

T2 - Water Science & Technology

JF - Water Science & Technology

SN - 0273-1223

IS - 8

ER -