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Impact of atmospheric pressure variations on aerobic biodegradation test

Liu, Gangjin ; Frankó, Balázs LU ; Strömberg, Sten LU ; Zheng, Dan ; Nistor, Mihaela ; Liu, Jing LU and Deng, Liangwei (2023) In Waste Management and Research 41(10). p.1559-1569
Abstract

Biodegradation rate is an important index to evaluate the environmental risk of chemicals, which is usually determined by measuring oxygen consumption through respirometer in a biodegradation test. However, atmospheric pressure variations affect reactor oxygen concentration and oxygen volume recorded by respirometer in biodegradation test, and the parameters of reactor volume and test material amount amplify its effect. Atmospheric pressure variation >1 kPa could introduce >20% underestimation in biodegradation rate when a small amount of test material (0.04–0.2 g per 100 g of inoculum) and high reactor volume (2–4 L) were used according to the international standards. A 5 kPa drop in atmospheric pressure leads to a 6% decrease in... (More)

Biodegradation rate is an important index to evaluate the environmental risk of chemicals, which is usually determined by measuring oxygen consumption through respirometer in a biodegradation test. However, atmospheric pressure variations affect reactor oxygen concentration and oxygen volume recorded by respirometer in biodegradation test, and the parameters of reactor volume and test material amount amplify its effect. Atmospheric pressure variation >1 kPa could introduce >20% underestimation in biodegradation rate when a small amount of test material (0.04–0.2 g per 100 g of inoculum) and high reactor volume (2–4 L) were used according to the international standards. A 5 kPa drop in atmospheric pressure leads to a 6% decrease in headspace oxygen concentration in the reactor, which could subsequently inhibit biodegradation microbials and decrease the biodegradation rate by 30%. Moreover, the biodegradation process (oxygen consumption rate) could be accelerated/delayed several times by atmospheric pressure variations compared to the process without variations when the oxygen consumption rate was <5 mL h−1 in a 0.5 or 1 L reactor and <10 mL h−1 in a 2-L reactor. Mitigating the effects of atmospheric pressure variations on biodegradation test includes lowering the reactor volume, increasing the test material amount and recording atmospheric pressure for further modification.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
aerobic biodegradation test, Atmospheric pressure variations, methodology, oxygen consumption, respirometer
in
Waste Management and Research
volume
41
issue
10
pages
1559 - 1569
publisher
SAGE Publications
external identifiers
  • pmid:37029528
  • scopus:85152432306
ISSN
0734-242X
DOI
10.1177/0734242X231164320
language
English
LU publication?
yes
id
b8ee18d2-1fd2-4bf4-8555-4f75899da908
date added to LUP
2023-07-20 11:31:39
date last changed
2024-04-19 23:48:40
@article{b8ee18d2-1fd2-4bf4-8555-4f75899da908,
  abstract     = {{<p>Biodegradation rate is an important index to evaluate the environmental risk of chemicals, which is usually determined by measuring oxygen consumption through respirometer in a biodegradation test. However, atmospheric pressure variations affect reactor oxygen concentration and oxygen volume recorded by respirometer in biodegradation test, and the parameters of reactor volume and test material amount amplify its effect. Atmospheric pressure variation &gt;1 kPa could introduce &gt;20% underestimation in biodegradation rate when a small amount of test material (0.04–0.2 g per 100 g of inoculum) and high reactor volume (2–4 L) were used according to the international standards. A 5 kPa drop in atmospheric pressure leads to a 6% decrease in headspace oxygen concentration in the reactor, which could subsequently inhibit biodegradation microbials and decrease the biodegradation rate by 30%. Moreover, the biodegradation process (oxygen consumption rate) could be accelerated/delayed several times by atmospheric pressure variations compared to the process without variations when the oxygen consumption rate was &lt;5 mL h<sup>−1</sup> in a 0.5 or 1 L reactor and &lt;10 mL h<sup>−1</sup> in a 2-L reactor. Mitigating the effects of atmospheric pressure variations on biodegradation test includes lowering the reactor volume, increasing the test material amount and recording atmospheric pressure for further modification.</p>}},
  author       = {{Liu, Gangjin and Frankó, Balázs and Strömberg, Sten and Zheng, Dan and Nistor, Mihaela and Liu, Jing and Deng, Liangwei}},
  issn         = {{0734-242X}},
  keywords     = {{aerobic biodegradation test; Atmospheric pressure variations; methodology; oxygen consumption; respirometer}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{1559--1569}},
  publisher    = {{SAGE Publications}},
  series       = {{Waste Management and Research}},
  title        = {{Impact of atmospheric pressure variations on aerobic biodegradation test}},
  url          = {{http://dx.doi.org/10.1177/0734242X231164320}},
  doi          = {{10.1177/0734242X231164320}},
  volume       = {{41}},
  year         = {{2023}},
}