Simulation of water removal process and optimization of aeration strategy in sewage sludge composting.

Reducing moisture in sewage sludge is one of the main goals of sewage sludge composting and biodrying. A mathematical model was used to simulate the performance of water removal under different aeration strategies. Additionally, the correlations between temperature, moisture content (MC), volatile solids (VS), oxygen content (OC), and ambient air temperature and aeration strategies were predicted. The mathematical model was verified based on coefficients of correlation between the measured and predicted results of over 0.80 for OC, MC, and VS, and 0.72 for temperature. The results of the simulation showed that water reduction was enhanced when the average aeration rate (AR) increased to 15.37 m(3) min(-1) (6/34 min/min, AR: 102.46 m(3) min(-1)), above which no further increase was observed. Furthermore, more water was removed under a higher on/off time of 7/33 (min/min, AR: 87.34 m(3) min(-1)), and when ambient air temperature was higher.

[1]  A. de Guardia,et al.  Influence of aeration rate on nitrogen dynamics during composting. , 2008, Waste management.

[2]  F. C. Miller,et al.  Composting Process Control Based on Interaction Between Microbial Heat Output and Temperature , 1981, Applied and environmental microbiology.

[3]  P. Aarne Vesilind,et al.  The role of water in sludge dewatering , 1994 .

[4]  L. Shao,et al.  Effect of air-flow rate and turning frequency on bio-drying of dewatered sludge. , 2010, Water research.

[5]  R. Haug.  The Practical Handbook of Compost Engineering , 1993 .

[6]  F. Prenafeta-Boldú,et al.  An integrated biochemical and physical model for the composting process. , 2007, Bioresource technology.

[7]  N. Ren,et al.  The modelling of combined strategies to achieve thermophilic composting of sludge in cold region , 2013 .

[8]  Paul Stuart,et al.  Emerging Biodrying Technology for the Drying of Pulp and Paper Mixed Sludges , 2006 .

[9]  Tongbin Chen,et al.  Application of a recyclable plastic bulking agent for sewage sludge composting. , 2014, Bioresource technology.

[10]  J. Devore,et al.  Statistics: The Exploration and Analysis of Data , 1986 .

[11]  Kiyohiko Nakasaki,et al.  Thermal balance in composting operations , 1987 .

[12]  I G Mason,et al.  Mathematical modelling of the composting process: a review. , 2006, Waste management.

[13]  Tetsuo Akiyama,et al.  A new composting model and assessment of optimum operation for effective drying of composting material , 1987 .

[14]  Hong-tao Liu,et al.  Influence of forced air volume on water evaporation during sewage sludge bio-drying. , 2013, Water research.

[15]  Hong-tao Liu,et al.  Moisture variation associated with water input and evaporation during sewage sludge bio-drying. , 2012, Bioresource technology.

[16]  Fabrizio Adani,et al.  Biostabilization-biodrying of municipal solid waste by inverting air-flow. , 2005, Bioresource technology.

[17]  Tiago Silva,et al.  Moisture Relationships in Composting Processes , 2002 .

[18]  Dirk De Clercq,et al.  A survey of bacteria and fungi occurring during composting and self-heating processes , 2003 .

[19]  Kamil Ekinci.  Theoretical and experimental studies on the effects of aeration strategies on the composting process , 2001 .

[20]  A. Hassen,et al.  Microbial characterization during composting of municipal solid waste. , 2001, Bioresource technology.

[21]  Fabrizio Adani,et al.  The influence of biomass temperature on biostabilization-biodrying of municipal solid waste. , 2002, Bioresource technology.

[22]  E. Epstein.  The science of composting , 1996 .

[23]  M. Hamoda,et al.  Evaluation of municipal solid waste composting kinetics , 1998 .

[24]  Harold M. Keener,et al.  NUMERICAL MODEL FOR THE DYNAMIC SIMULATION OF A LARGE SCALE COMPOSTING SYSTEM , 1997 .

[25]  Weiguang Li,et al.  Spatial distribution of dynamics characteristic in the intermittent aeration static composting of sewage sludge. , 2011, Bioresource technology.

[26]  F. C. Miller,et al.  Matric water potential as an ecological determinant in compost, a substrate dense system , 1989, Microbial Ecology.