High Rate Anaerobic Digestion With Mechanical Shear – A Case Study at the Caldwell, Id WWTP

Basu, Somnath; Abu-Orf, Mohammad; Laquidara, Mark; Boe, Owen K.; Sanchez, Gilbert; Law, Gordon T.; Muller, Christopher; Nova, John T.

doi:10.2175/193864704784131789

Cited by 8 publications

(3 citation statements)

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“…However, the Kady process did not appear to improve the sludge volume index and appeared to be susceptible to settling problems due to spring wet weather flows; these issues were not resolved at the time. The Kady Biolysis system was also tested on the digester heat recirculation loop at the 20.8 MLD Caldwell WWTP, Idaho (Basu et al, 2004). A similar digester was used as the 'control', but was maintained at the baseline loading rate.…”

Section: Mechanical Shearingmentioning

confidence: 99%

Current State of the Practice of Sludge Reduction Technologies

Sandino¹,

Roxburgh²,

Whitlock³

et al. 2008

proc water environ fed

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The handling and disposal of wastewater sludge is an increasingly costly portion of the operation of a wastewater treatment plant and is developing into an even greater future risk given the trend of decreasing availability and increasing costs of ultimate disposal options. Recently several technologies and process innovations have been proposed to reduce or eliminate the waste activated sludge (WAS) fraction resulting from treatment, or to render it more amenable to anaerobic digestion, a common sludge stabilization step, in order to maximize biogas production and the corresponding potential for energy cogeneration. Several of these technologies are also claiming significant improvements in the dewatering characteristics of the stabilized biosolids as a result of these pre-conditioning steps. The above claims are especially relevant for industrial facilities and smaller municipal facilities which frequently have no primary sludge but generate large quantities of difficult-to-dewater waste biomass. WERF's 05-CTS-3 Evaluation of Processes to Reduce Activated Sludge Solids Generation andDisposal, which started in the Spring of 2007, seeks to establish a comprehensive evaluation methodology for WAS reduction processes based on the in-depth consideration of a select number of technologies considered to be representative of the many options currently available in the marketplace. These technologies will cover both those intended to reduce the generation of residual sludge from the liquid treatment process, as well as those designed to pre-condition whatever sludge is produced in order to make it more amenable to a subsequent stabilization process such as anaerobic digestion. This paper presents the results of a literature review task conducted in the initial stages of the project, and is intended to be the first one of a series of papers in which the results of this important project are presented to the Residuals and Biosolids community of practitioners. This literature review places into perspective the basic mechanism behind the different WAS Reduction technologies, finding applications worldwide, identifying their application point within the treatment facility (i.e., digestion pretreatment, treatment of activated sludge recycle streams), and defining its development status.

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Section: Mechanical Shearingmentioning

confidence: 99%

Current State of the Practice of Sludge Reduction Technologies

Sandino¹,

Roxburgh²,

Whitlock³

et al. 2008

proc water environ fed

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show abstract

“…The Kady Bio-Lysis System was also tested on the digester heat recirculation loop at the 20.8 MLD (5.5 mgd) Caldwell WWTP, Idaho (Basu et. al, 2004).…”

Section: Kady Bio-lysis Systemmentioning

confidence: 99%

Sludge Minimization Technologies- Doing more to get Less

Roxburgh¹,

Sieger²,

Johnson³

et al. 2006

proc water environ fed

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Sludge minimization technologies have been available for several decades; however recent developments have brought some sludge minimization technologies to the forefront. All of the technologies utilize one or more of three basic approaches to minimize the amount of waste activated sludge produced by an activated sludge process: cell lysis, cyclic oxic environments, and long solids retention time. This paper will discuss the three basic mechanisms, will review the development of several sludge minimization technologies, and will report on the current viability of each technology as well as current research needs for each. 506 WEFTEC®.06

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“…Cartmell et al (2004) reported modest increases in biogas production (10-36%) when waste activated sludge was pretreated in two different mechanical processes that are commonly employed in the paper industry (deflaker and disc refiner). Basu et al (2004) reported a full scale study where a recycle stream on an anaerobic digester was treated in a shearing mill. It was found that with the mechanical treatment, the loading onto a digester could be substantial increased (from 0.08 to 0.18 lb/ft 3 /day) without deterioration in sludge quality.…”

Section: Technologies To Enhance Anaerobic Digestionmentioning

confidence: 99%

Biosolids and Sludge Management

Parker¹,

Laha²

2005

Water Environment Research

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This review section covers journal articles and conference papers related to biosolids and sludge management that were published in 2004. The literature review has been divided into the following sections: •Biosolids management issues,• Biosolids and sludge quality, marginal or contaminated lands: such applications have been classified under nonagricultural uses. BIOSOLIDS MANAGEMENT ISSUESSpinosa (2004) provided an overview of more sustainable sludge management through the recovery and reuse of valuable products including both materials and energy. Because the selection of an appropriate sludge management system is influenced by many other factors, such as local economy and geography, climate, land use, regulatory constraints and public acceptance of the various practices, only general indications were given. Rulkens (2004) examined the challenges facing sustainable sludge management, providing a survey of the most relevant sludge treatment options and separate treatment steps. Rulkens (2004) paid special attention to those processes that are concurrently focused on the elimination of the risks for environment and human health and on the recovery or beneficial use of valuable sludge components such as organic carbon compounds, etc. Jiminez et al. (2004) discussed sustainable sludge management in developing countries where unsanitary conditions are responsible for more than three million deaths annually. They indicated that sludge management plays an important role in sanitation programs by helping reduce health problems and associated risks particularly because of the high microbial concentrations in sludge. Policies on sludge (or biosolids) management vary widely, particularly when decisions must be made on what to do with the final product. Dentel (2004) examined the two principal rationales with which such decisions are made: these are risk analysis (risk assessment and management), and the criterion of sustainability. Both were found to be potentially arbitrary due to the difficulty in defining the individual constituents necessary to relate environmental phenomena to environmental policy. Dentel (2004) presented research results from three recent projects concerned with contaminants in sludge (phosphorus, flocculent polymers, and polymer-surfactant aggregates), used the findings to 1467

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High Rate Anaerobic Digestion With Mechanical Shear – A Case Study at the Caldwell, Id WWTP

Cited by 8 publications

References 0 publications

Current State of the Practice of Sludge Reduction Technologies

Current State of the Practice of Sludge Reduction Technologies

Sludge Minimization Technologies- Doing more to get Less

Biosolids and Sludge Management

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