Sewage sludge composting simulation as carbon/nitrogen concentration change

作     者：Nassereldeen Kabbashi 

作者机构：Bio-Environmental Research UnitDepartment of Biotechnology Engineering International Islamic University Malaysia (IIUM)Jalan GombakP.O.Box 1050728Malaysia 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2011年第23卷第11期

页      面：1925-1928页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：composting sewage sludge HDB modeling reaction rate 

摘      要：Available composting models do not describe accurately the dynamics of composting *** 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 *** of controlled sewage sludge composting experiments were used in the *** 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 *** 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 *** is found that change in the concentration of total carbon can reasonably be described by three constant process rate coefficients （k 1,k 2,k 3 ）.It is found that the process starts with a certain process rate coefficient （k 1 ） and continues until peak temperature is reached,then it reaches lower process （k 2 ） in the declining phase of the thermophilic stage,and finally it proceeds with a faster process rate （k 3 ） when maturation is *** in the concentration of total nitrogen has shown to have the same patterns of change as carbon.