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/ http://irep.iium.edu.my/8126/ http://irep.iium.edu.my/8126/ http://irep.iium.edu.my/8126/1/Sewage_sludge_composting_simulation_carbon_nitrogen_concentration_change.pdf

id	iium-8126
recordtype	eprints
spelling	iium-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 PeerReviewed 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
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
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/ http://irep.iium.edu.my/8126/ http://irep.iium.edu.my/8126/ http://irep.iium.edu.my/8126/1/Sewage_sludge_composting_simulation_carbon_nitrogen_concentration_change.pdf
first_indexed	2023-09-18T20:17:46Z
last_indexed	2023-09-18T20:17:46Z
_version_	1777407902910251008

Sewage sludge composting simulation as carbon/nitrogen concentration change

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