Solids removal in upflow anaerobic reactors, a review.

This desk study deals with the mechanisms and parameters affecting particles separation from wastewater in mainly upflow anaerobic reactors. Despite the fact that the functioning of upflow anaerobic sludge blanket (UASB) systems depends on both physical parameters and biological processes, the physical parameters have been barely reported in the literature. The reason is that the underlying mechanisms are very complex and depend on various interrelated parameters. In addition, the lack of a serious attempt to gather the entire physical theme into one picture has resulted in just a superficial understanding of this field of science. Better understanding of the interaction and role of these parameters is essential for the development of anaerobic treatment technologies. In this study, the various parameters that might affect the solid liquid separation process by filtration through the sludge bed of a UASB have been elaborated. These parameters have been classified into (1) reactor operational conditions (temperature, organic loading rate, hydraulic retention time and upflow velocity), (2) influent characteristics (influent concentration, influent particle size and influent particle charge) and (3) sludge bed characteristics (particle size distribution, extracellular polymeric substances, and charge). The overall output of this study includes (1) a literature review, (2) structuring of this field of science, and (3) highlighting fields where research is needed.

[1]  C. F. Forster,et al.  A comparative study of the nature of biopolymers extracted from anaerobic and activated sludges , 1990 .

[2]  K. Marshall.  Electrophoretic properties of fast- and slow-growing species of Rhizobium. , 1967, Australian journal of biological sciences.

[3]  G Lettinga,et al.  Anaerobic treatment of domestic sewage at low temperature. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[4]  W. Wiegant.  Experiences and potential of anaerobic wastewater treatment in tropical regions. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[5]  K. Keiding,et al.  Extraction of extracellular polymers from activated sludge using a cation exchange resin , 1996 .

[6]  Hallvard Ødegaard.  The influence of wastewater characteristics on choice of wastewater treatment method , 1999 .

[7]  Kaijun Wang,et al.  Integrated anaerobic and aerobic treatment of sewage , 1994 .

[8]  C. Forster.  Factors involved in the settlement of activated sludge—I: Nutrients and surface polymers , 1985 .

[9]  J. Barber,et al.  Evaluation of biological sludge properties influencing volume reduction , 1986 .

[10]  S. Pavlostathis,et al.  Kinetics of Anaerobic Treatment , 1991 .

[11]  T. E. Cloete,et al.  A combined membrane filter-immunofluorescent technique for the in situ identification and enumeration of Acinetobacter in activated sludge , 1988 .

[12]  H. Furumai,et al.  Surface charge and extracellular polymer of sludge in the anaerobic degradation process , 1996 .

[13]  D. Lawler.  Particle size distributions in treatment processes: Theory and practice , 1997 .

[14]  I. Sutherland.  Microbial exopolysaccharides -- their role in microbial adhesion in aqueous systems. , 1983, Critical reviews in microbiology.

[15]  C. Forster.  Preliminary studies on the relationship between sewage sludge viscosities and the nature of the surfaces of the component particles , 1981, Biotechnology Letters.

[16]  G. Jackson,et al.  Granular media filtration in water and wastewater treatment, part 1∗ , 1980 .

[17]  S. Shioya,et al.  Properties of Extracellular Polymer Having an Effect on Expression of Activated Sludge , 1990 .

[18]  N. J. Horan,et al.  PURIFICATION AND CHARACTERIZATION OF EXTRACELLULAR POLYSACCHARIDE FROM ACTIVATED SLUDGES , 1986 .

[19]  S. Nambu,et al.  Biochemical and physical properties of an activated sludge on settling characteristics , 1976 .

[20]  C. Forster,et al.  The nature of activated sludge flocs , 1976 .

[21]  Carlos Augusto de Lemos Chernicharo,et al.  Feasibility of the UASB/AF system for domestic sewage treatment in developing countries , 1998 .

[22]  J. Manem,et al.  Bioflocculation in activated sludge: an analytic approach , 1993 .

[23]  A. Charlier,et al.  Primary fermentation of soluble and particulate organic matter for wastewater treatment , 1994 .

[24]  Grietje Zeeman,et al.  Low temperature treatment of domestic sewage in upflow anaerobic sludge blanket and anaerobic hybrid reactors , 1999 .

[25]  A. Adin,et al.  Particle size distribution and wastewater filter performance , 1997 .

[26]  J. Lester,et al.  Comparison of Bacterial Extracellular Polymer Extraction Methods , 1980, Applied and environmental microbiology.

[27]  George Tchobanoglous,et al.  Wastewater Engineering Treatment Disposal Reuse , 1972 .

[28]  B. Jiménez,et al.  Particle size distribution in an efluent from an advanced primary treatment and its removal during filtration , 1997 .

[29]  Bert Hamelers,et al.  Effect of temperature on hydrolysis rates of selected biowaste components , 1999 .

[30]  W. Sanders,et al.  Anaerobic hydrolysis during digestion of complex substrates , 2001 .

[31]  B. Rittmann,et al.  Colloid Removal in Fluidized‐Bed Biofilm Reactor , 1990 .

[32]  L. Eriksson,et al.  Study of Flocculation Mechanisms by Observing Effects of a Complexing Agent on Activated Sludge Properties , 1991 .

[33]  Sergey Kalyuzhnyi,et al.  Anaerobic treatment of raw and preclarified potato-maize wastewaters in a USAB reactor , 1998 .

[34]  Grietje Zeeman,et al.  The role of anaerobic digestion of domestic sewage in closing the water and nutrient cycle at community level , 1999 .

[35]  G. Zeeman,et al.  Biodegradability and change of physical characteristics of particles during anaerobic digestion of domestic sewage. , 2001, Water research.

[36]  T. Asano,et al.  Characterization of the size distribution of contaminants in wastewater: treatment and reuse implications , 1985 .

[37]  J. Darby,et al.  Extracellular polyanions in digested sludge: Measurement and relationship to sludge dewaterability , 1997 .

[38]  M. C. Kavanaugh,et al.  Particle characteristics and headloss increase in granular media filtration , 1995 .

[39]  H. Hamana,et al.  Isolation and characterization of polymeric organic materials in a polluted river water , 1980 .

[40]  H. Furumai,et al.  Yields of Biomass and Extracellular Polymers in Four Anaerobic Sludges , 1996 .

[41]  L. Eriksson,et al.  Direct influence of wastewater pollutants on flocculation and sedimentation behaviour in biological wastewater treatment—I model system E. coli B , 1981 .

[42]  G. Jackson,et al.  Granular media filtration in water and wastewater treatment: Part 2∗ , 1980 .

[43]  J. Lester,et al.  Extraction of extracellular polymers from activated sludge , 1983, Biotechnology Letters.

[44]  K. Keiding,et al.  A Comparative Study of Biopolymers from a Conventional and an Advanced Activated Sludge Treatment Plant , 1994 .

[45]  L. Eriksson,et al.  Settling Properties of Activated Sludge Related to Floc Structure , 1984 .

[46]  M. Veiga,et al.  Treatment of slaughterhouse wastewater in a UASB reactor and an anaerobic filter , 1997 .

[47]  Hans-Curt Flemming,et al.  Sorption sites in biofilms , 1995 .

[48]  M. W. Tenney,et al.  Chemical flocculation of microorganisms in biological waste treatment. , 1965, Journal - Water Pollution Control Federation.

[49]  D. Lawler,et al.  Anaerobic digestion: effects on particle size and dewaterability , 1986 .

[50]  Improved performance of upflow anaerobic sludge blanket (UASB) reactors by operating alternatives , 1990, Biotechnology Letters.

[51]  Mogens Henze,et al.  Wastewater Treatment: Biological and Chemical Processes , 1995 .

[52]  C. Forster,et al.  A further examination into the composition of activated sludge surfaces in relation to their settlement characteristics , 1985 .

[53]  B. Rittmann,et al.  A unified theory for extracellular polymeric substances, soluble microbial products, and active and inert biomass. , 2002, Water research.

[54]  S. Sayed,et al.  Anaerobic treatment of slaughterhouse wastewater using the UASB process , 1987 .

[55]  Grietje Zeeman,et al.  Anaerobic treatment of complex wastewater and waste activated sludge – application of an upflow anaerobic solid removal (UASR) reactor for the removal and pre-hydrolysis of suspended COD , 1997 .

[56]  Grietje Zeeman,et al.  The role of filter media in removing suspended and colloidal particles in an anaerobic reactor treating domestic sewage , 2000 .

[57]  J. Ferguson,et al.  Solubilization of particulate organic carbon during the acid phase of anaerobic digestion , 1981 .

[58]  Tomoo Suzuki,et al.  Culture Conditions for Production of Microbial Flocculant by Rhodococcus erythropolis , 1986 .