Effect of low solids retention time and focused pulsed pre-treatment on anaerobic digestion of waste activated sludge.

The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20 days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT ≥ 5 days, but the effluent soluble organic compounds increased significantly for SRT=2 days due to a combination of faster hydrolysis kinetics and washout of methanogens. FP treatment increased the CH(4) production rate and TCOD removal efficiency by up to 33% and 18%, respectively, at a SRT of 20 days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT ≥ 5 days. Alternately, FP pre-treatment of WAS allowed the same conversion of TCOD to CH(4) with a smaller SRT and digester size: e.g., 40% size savings with a CH(4) conversion of 0.23 g CH(4)-COD/g COD(in).

[1]  Matthew J. Higgins,et al.  Characterization of Exocellular Protein and Its Role in Bioflocculation , 1997 .

[2]  P. Mccarty,et al.  Environmental Biotechnology: Principles and Applications , 2000 .

[3]  P. Parameswaran,et al.  Feasibility of Focused‐Pulsed Treated Waste Activated Sludge as a Supplemental Electron Donor for Denitrification , 2010, Water environment research : a research publication of the Water Environment Federation.

[4]  M. Torrijos,et al.  DEFINITION OF OPTIMAL CONDITIONS FOR THE HYDROLYSIS AND ACIDOGENESIS OF A PHARMACEUTICAL MICROBIAL BIOMASS , 1997 .

[5]  J. Müller,et al.  Prospects and problems of sludge pre-treatment processes. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[6]  Samir Kumar Khanal,et al.  Ultrasound Applications in Wastewater Sludge Pretreatment: A Review , 2007 .

[7]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[8]  Prathap Parameswaran,et al.  Focused-Pulsed sludge pre-treatment increases the bacterial diversity and relative abundance of acetoclastic methanogens in a full-scale anaerobic digester. , 2009, Water research.

[9]  M. C. Sterling,et al.  Effects of ammonia nitrogen of H2 and CH4 production during anaerobic digestion of dairy cattle manure. , 2001, Bioresource technology.

[10]  G. Lyberatos,et al.  Performance of a glucose fed periodic anaerobic baffled reactor under increasing organic loading conditions: 1. Experimental results. , 2003, Bioresource technology.

[11]  J. Gossett,et al.  Anaerobic Digestion of Waste Activated Sludge , 1982 .

[12]  Han-Qing Yu,et al.  Modeling microbial products in activated sludge under feast-famine conditions. , 2009, Environmental science & technology.

[13]  V. Vavilin,et al.  A description of hydrolysis kinetics in anaerobic degradation of particulate organic matter , 1996 .

[14]  B. Eliosov,et al.  Hydrolysis of particulate organics in activated sludge systems , 1995 .

[15]  F. Smith,et al.  COLORIMETRIC METHOD FOR DETER-MINATION OF SUGAR AND RELATED SUBSTANCE , 1956 .

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

[17]  R. Brown,et al.  Protein measurement using bicinchoninic acid: elimination of interfering substances. , 1989, Analytical biochemistry.

[18]  Tomonori Matsuo,et al.  Evaluation of the rate of hydrolysis of slowly biodegradable COD (SBCOD) using starch as substrate under anaerobic, anoxic and aerobic conditions , 1994 .

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

[20]  P. Parameswaran,et al.  Using a Pulsed Electric Field as a Pretreatment for Improved Biosolids Digestion and Methanogenesis , 2009, Water environment research : a research publication of the Water Environment Federation.

[21]  Hanqing Yu,et al.  Stability of sludge flocs under shear conditions: Roles of extracellular polymeric substances (EPS) , 2006, Biotechnology and bioengineering.

[22]  J. Novak,et al.  Mechanisms of floc destruction during anaerobic and aerobic digestion and the effect on conditioning and dewatering of biosolids. , 2003, Water research.

[23]  B. Rittmann,et al.  Full-scale application of focused-pulsed pre-treatment for improving biosolids digestion and conversion to methane. , 2008, Water science and technology : a journal of the International Association on Water Pollution Research.

[24]  N. Horan,et al.  Biological Wastewater Treatment Systems: Theory and Operation , 1990 .

[25]  Jeongsik Kim,et al.  Effects of various pretreatments for enhanced anaerobic digestion with waste activated sludge. , 2003, Journal of bioscience and bioengineering.