Biodrying of municipal solid waste under different ventilation modes: drying efficiency and aqueous pollution

Ventilation is very important during the biodrying process because it affects the biodrying efficiency and secondary pollution. In this study, three ventilation modes—intermittent negative ventilation (IN), continuous negative ventilation (CN) and intermittent positive ventilation (IP)—were used to provide the same amount of total air during biodrying of municipal solid waste (MSW). During the entire 16-day experiment, 68.4%, 68.7% and 67.2% of water contained in the initial waste was removed under IN, CN and IP trials respectively. The ratio of water loss to volatile solid loss was used to evaluate the biodrying efficiency, with values of 5.35, 5.93 and 4.82 being observed for IN, CN and IP trials respectively. The total organic carbon concentrations of the leachate generated from the biodrying of waste were as high as 25,000 mg/l, while those of the condensate were not higher than 3500 mg/l. During the entire process, the average ammonia concentrations of leachate and condensate were 1350 mg/l and 2140 mg/l respectively. From the aspect of biodrying efficiency, continuous negative ventilation was the most preferable ventilation mode for biodrying of MSW, while special care should be taken to prevent aqueous pollution if it is used in a MSW treatment plant.

[1]  M. Bertoldi,et al.  The Biology of Composting: a Review , 1983 .

[2]  D. Williams,et al.  Design and operation of an aerated windrow composting facility , 1985 .

[3]  Emeterio Iglesias Jiménez,et al.  Composting of domestic refuse and sewage sludge. I. Evolution of temperature, pH, C/N ratio and cation-exchange capacity , 1991 .

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

[5]  M. Bertoldi,et al.  The Science of Composting , 1996 .

[6]  Tom L. Richard,et al.  Composting High Moisture Materials: Biodrying Poultry Manure in a Sequentially Fed Reactor , 2001 .

[7]  Tao Guihe,et al.  Kinetic analysis of forced aeration composting - I. Reaction rates and temperature. , 2000 .

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

[9]  Frederick C. Michel,et al.  EFFECTS OF AERATION STRATEGIES ON THE COMPOSTING PROCESS: PART I. EXPERIMENTAL STUDIES , 2004 .

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

[11]  M. Martínez,et al.  Volatile organic compounds produced during the aerobic biological processing of municipal solid waste in a pilot plant. , 2005, Chemosphere.

[12]  E C Rada,et al.  Lower Heating Value Dynamics during Municipal Solid Waste Bio-Drying , 2007, Environmental technology.

[13]  L. Shao,et al.  Bio-drying of municipal solid waste with high water content by aeration procedures regulation and inoculation. , 2008, Bioresource technology.

[14]  Pinjing He,et al.  Biodrying of municipal solid waste with high water content by combined hydrolytic-aerobic technology. , 2008, Journal of environmental sciences.

[15]  L. Shao,et al.  Effect of inoculation time on the bio-drying performance of combined hydrolytic-aerobic process. , 2009, Bioresource technology.

[16]  C A Velis,et al.  Biodrying for mechanical-biological treatment of wastes: a review of process science and engineering. , 2009, Bioresource technology.

[17]  Sun Ying-jie.  Effects of Different Aeration Pattern on Co-composting of Night Soil and Leaf , 2010 .

[18]  X. Font,et al.  Odours and volatile organic compounds emitted from municipal solid waste at different stage of decomposition and relationship with biological stability. , 2011, Bioresource technology.

[19]  Xiao He,et al.  The emission patterns of volatile organic compounds during aerobic biotreatment of municipal solid waste using continuous and intermittent aeration , 2012, Journal of the Air & Waste Management Association.