Vermistabilization of primary sewage sludge.

An integrated composting-vermicomposting process has been developed for utilization of primary sewage sludge (PSS). Matured vermicompost was used as bulking material and a source of active microbial culture during aerobic activated composting (AAC). AAC resulted in sufficient enrichment of bulking material with organic matter after 20 cycles of recycling and mixing with PSS and produced materials acceptable for vermicomposting. Vermicomposting caused significant reduction in pH, volatile solids (VS), specific oxygen uptake rate (SOUR), total organic carbon (TOC), C/N ratio and pathogens and substantial increase in electrical conductivity (EC), total nitrogen (TN) and total phosphorous (TP) as compared to compost. Environmental conditions and stocking density have profound effects on vermicomposting. Temperature of 20°C with high humidity is favorable environmental condition for vermicomposting employing Eisenia fetida. Favorable stocking density range for vermiculture is 0.5-2.0 kg m(-2) (optimum: 0.5 kg m(-2)) and for vermicomposting is 2.0-4.0 kg m(-2) (optimum: 3.0 kg m(-2)), respectively.

[1]  Wayne H. Thompson,et al.  Test methods for the examination of composting and compost , 1998 .

[2]  Esther Llorens,et al.  Sludge dewatering and stabilization in drying reed beds: characterization of three full-scale systems in Catalonia, Spain. , 2009, Bioresource Technology.

[3]  M. Bertoldi,et al.  Compost: Production, Quality, and Use , 1987 .

[4]  Jorge Domínguez,et al.  Seasonal population dynamics of Eisenia fetida (Savigny, 1826) (Oligochaeta, Lumbricidae) in the field. , 2006, Comptes rendus biologies.

[5]  P. Ndegwa,et al.  Integrating composting and vermicomposting in the treatment and bioconversion of biosolids. , 2001, Bioresource technology.

[6]  V. Garg,et al.  Vermicomposting of mixed solid textile mill sludge and cow dung with the epigeic earthworm Eisenia foetida. , 2003, Bioresource technology.

[7]  Luis Sampedro,et al.  Vermicomposting of sludges from paper mill and dairy industries with Eisenia andrei: A pilot-scale study , 1998 .

[8]  N. Senesi,et al.  Composted materials as organic fertilizers , 1989 .

[9]  B. R. Eastman,et al.  The Effectiveness of Vermiculture in Human Pathogen Reduction for USEPA Biosolids Stabilization , 2001 .

[10]  D. G. Allen,et al.  Alkaline extraction of wastewater activated sludge biosolids. , 2010, Bioresource technology.

[11]  Richard M. Dinsdale,et al.  Production of hydrogen from sewage biosolids in a continuously fed bioreactor: Effect of hydraulic retention time and sparging , 2010 .

[12]  Clive A. Edwards,et al.  Vermicomposting organic wastes : A review , 2006 .

[13]  D. Kaplan,et al.  Growth of the earthworm Eisenia foetida in relation to population density and food rationing , 1980 .

[14]  Vinod Tare,et al.  Vermicomposting of source-separated human faeces for nutrient recycling. , 2010, Waste management.

[15]  Satyawati Sharma,et al.  Municipal solid waste management through vermicomposting employing exotic and local species of earthworms. , 2003, Bioresource technology.

[16]  R. M. Morris,et al.  Combining vermiculture with traditional green waste composting systems , 1997 .

[17]  H. Obarska-Pempkowiak,et al.  Polish experience with sewage sludge utilization in reed beds , 2000 .

[18]  L. Dendooven,et al.  Vermicomposting of biosolids with cow manure and oat straw , 2005, Biology and Fertility of Soils.

[19]  E. V. Ramasamy,et al.  Solid Waste Management with Earthworms , 2005 .

[20]  C. Edwards,et al.  Earthworms in Waste and Environmental Management , 1990 .

[21]  S. Shrestha,et al.  Risk Management in Vermicomposting of Domestic Organic Waste , 2004 .

[22]  V. Garg,et al.  Stabilization of primary sewage sludge during vermicomposting. , 2008, Journal of hazardous materials.

[23]  Pius M. Ndegwa,et al.  Effects of stocking density and feeding rate on vermicomposting of biosolids , 2000 .

[24]  Z. Hseu,et al.  Elucidating the process of co-composting of biosolids and spent activated clay. , 2010, Bioresource technology.

[25]  V. Garg,et al.  Dynamics of biological and chemical parameters during vermicomposting of solid textile mill sludge mixed with cow dung and agricultural residues. , 2004, Bioresource technology.

[26]  K. E. Lee.  Some trends and opportunities in earthworm research or: Darwin's children—the future of our discipline , 1992 .

[27]  S. H. Hanna,et al.  Soil zoology for sustainable development in the 21st century: a festschrift in honour of Prof. Samir I. Ghabbour on the occasion of his 70th birthday. , 2004 .

[28]  S. Suthar,et al.  Feasibility of vermicomposting in biostabilization of sludge from a distillery industry. , 2008, The Science of the total environment.

[29]  M. Aiello,et al.  Phragmites australis for sewage sludge stabilization , 2009 .

[30]  M. Khwairakpam,et al.  Vermitechnology for sewage sludge recycling. , 2009, Journal of hazardous materials.

[31]  J. C. Williamson,et al.  Heavy metal fractionation during the co-composting of biosolids, deinking paper fibre and green waste. , 2009, Bioresource technology.

[32]  Katia Lasaridi,et al.  A simple respirometric technique for assessing compost stability , 1998 .

[33]  A. E. Greenberg,et al.  Standard Methods for the Examination of Water and Wastewater seventh edition , 2013 .

[34]  M. Ghosh,et al.  Transformation of phosphorus during vermicomposting , 1999 .

[35]  Clive A. Edwards,et al.  Effects of stocking rate and moisture content on the growth and maturation of Eisenia andrei (Oligochaeta) in pig manure , 1997 .

[36]  Rod Greenshields,et al.  Resources and Applications of Biotechnology , 1988, Palgrave Macmillan UK.

[37]  M. C. Dash,et al.  Observation on the effect of earthworm in the decomposition process in soil under laboratory conditions. , 1980 .

[38]  Esther Llorens,et al.  Sludge treatment wetlands: a review on the state of the art. , 2010, Bioresource technology.