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Sewage sludge composting simulation as carbon/nitrogen concentration change

Available composting models do not describe accurately the dynamics of composting processes. Difficulty in modeling composting processes is attributed mainly to the unpredicted change in process rate caused by change in activation energy value (E). This article presented the results of an attempt...

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Main Author: Kabbashi, Nassereldeen Ahmed
Format: Article
Language:English
Published: Elsevier BV 2011
Subjects:
TD511 Sewage collection and disposal systems. Sewerage
Online Access:http://irep.iium.edu.my/8126/1/Sewage_sludge_composting_simulation_carbon_nitrogen_concentration_change.pdf
http://irep.iium.edu.my/8126/
http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2011231123&flag=1
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spelling my.iium.irep.81262013-06-25T04:19:40Z http://irep.iium.edu.my/8126/ Sewage sludge composting simulation as carbon/nitrogen concentration change Kabbashi, Nassereldeen Ahmed TD511 Sewage collection and disposal systems. Sewerage Available composting models do not describe accurately the dynamics of composting processes. Difficulty in modeling composting processes is attributed mainly to the unpredicted change in process rate caused by change in activation energy value (E). This article presented the results of an attempt made to utilize patterns of change in carbon, nitrogen and temperature profiles to model sewage sludge composting process as a multi-stage process. Results of controlled sewage sludge composting experiments were used in the study. All the experiments were carried out as batch experiments in a 300-liter Horizontal Drum Bioreactor (HDB). Analysis of the profiles of carbon, nitrogen and temperature has indicated that there were clear patterns that could be used to develop simple models of the process, the initial C/N ratio was between 7–8 and the final C/N ratio of the compost in most experiments were found to be around 15.0, indicating the compost was fully matured and could be used safely for agricultural purpose. Electrical conductivity of composting material decreased from 1.83 to 1.67 dS/m, after a period, it increased gradually from 2.01 to 2.23 dS/m and remained at around 2.33 dS/m till the end of composting. It is found that change in the concentration of total carbon can reasonably be described by three constant process rate coefficients (k1, k2, k3). It is found that the process starts with a certain process rate coefficient (k1) and continues until peak temperature is reached, then it reaches lower process (k2) in the declining phase of the thermophilic stage, and finally it proceeds with a faster process rate (k3) when maturation is reached. Change in the concentration of total nitrogen has shown to have the same patterns of change as carbon. Elsevier BV 2011-11 Article REM application/pdf en http://irep.iium.edu.my/8126/1/Sewage_sludge_composting_simulation_carbon_nitrogen_concentration_change.pdf Kabbashi, Nassereldeen Ahmed (2011) Sewage sludge composting simulation as carbon/nitrogen concentration change. Journal of Environmental Sciences-China, 23 (11). pp. 1925-1928. ISSN 1001-0742 http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2011231123&flag=1 DOI: 10.1016/S1001-0742(10)60642-0
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TD511 Sewage collection and disposal systems. Sewerage
spellingShingle TD511 Sewage collection and disposal systems. Sewerage
Kabbashi, Nassereldeen Ahmed
Sewage sludge composting simulation as carbon/nitrogen concentration change
description Available composting models do not describe accurately the dynamics of composting processes. Difficulty in modeling composting processes is attributed mainly to the unpredicted change in process rate caused by change in activation energy value (E). This article presented the results of an attempt made to utilize patterns of change in carbon, nitrogen and temperature profiles to model sewage sludge composting process as a multi-stage process. Results of controlled sewage sludge composting experiments were used in the study. All the experiments were carried out as batch experiments in a 300-liter Horizontal Drum Bioreactor (HDB). Analysis of the profiles of carbon, nitrogen and temperature has indicated that there were clear patterns that could be used to develop simple models of the process, the initial C/N ratio was between 7–8 and the final C/N ratio of the compost in most experiments were found to be around 15.0, indicating the compost was fully matured and could be used safely for agricultural purpose. Electrical conductivity of composting material decreased from 1.83 to 1.67 dS/m, after a period, it increased gradually from 2.01 to 2.23 dS/m and remained at around 2.33 dS/m till the end of composting. It is found that change in the concentration of total carbon can reasonably be described by three constant process rate coefficients (k1, k2, k3). It is found that the process starts with a certain process rate coefficient (k1) and continues until peak temperature is reached, then it reaches lower process (k2) in the declining phase of the thermophilic stage, and finally it proceeds with a faster process rate (k3) when maturation is reached. Change in the concentration of total nitrogen has shown to have the same patterns of change as carbon.
format Article
author Kabbashi, Nassereldeen Ahmed
author_facet Kabbashi, Nassereldeen Ahmed
author_sort Kabbashi, Nassereldeen Ahmed
title Sewage sludge composting simulation as carbon/nitrogen concentration change
title_short Sewage sludge composting simulation as carbon/nitrogen concentration change
title_full Sewage sludge composting simulation as carbon/nitrogen concentration change
title_fullStr Sewage sludge composting simulation as carbon/nitrogen concentration change
title_full_unstemmed Sewage sludge composting simulation as carbon/nitrogen concentration change
title_sort sewage sludge composting simulation as carbon/nitrogen concentration change
publisher Elsevier BV
publishDate 2011
url http://irep.iium.edu.my/8126/1/Sewage_sludge_composting_simulation_carbon_nitrogen_concentration_change.pdf
http://irep.iium.edu.my/8126/
http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2011231123&flag=1
_version_ 1643606075396587520
score 13.211869

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