Lab Scale Comparison of Anaerobic Digestion Alternatives

Reusser, Steve; Zelinka, Greg

doi:10.2175/193864701802779495

Cited by 3 publications

(4 citation statements)

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“…This situation has been observed by several authors in systems operating with anaerobic digestion thermophilic sludge 13, 14. Reusser and Zelinka15 report that, after operating at 15 days SRT, the VFA concentration was 2,558 mg of acetic acid/L.…”

Section: Resultssupporting

confidence: 62%

Temperature conversion (mesophilic to thermophilic) of municipal sludge digestion

et al. 2005

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Section: Resultssupporting

confidence: 62%

Temperature conversion (mesophilic to thermophilic) of municipal sludge digestion

et al. 2005

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“…One possible option to reduce odor emissions is to use a process in which the thermophilic stage is followed by a mesophilic stage, such as temperature phased anaerobic digestion (TPAD) ( Schafer et al, 2003 ). Although volatile solids and pathogen destruction by TPAD has been well‐documented in laboratory‐ and pilot‐scale tests (e.g., Bucher et al, 2001 ; Reusser and Zelinka, 2001 ; Sandino et al, 2002 ; Santha et al, 2003 ), and several plants have implemented TPAD on a full scale ( Arant et al, 2003 ; Schafer et al, 2003 ; Wilson and Dichtl, 1998 ), the effect of polishing by a mesophilic stage on reducing odor emissions has not been well‐established. We opted for reducing the digester temperature in Phase V to the lower end of the thermophilic range, to maintain disinfecting conditions, while reducing odor emissions.…”

Section: Discussionmentioning

confidence: 99%

“…During Phases I and II (October 2001to March 2002, a battery of six digesters was converted to thermophilic operation as a two-stage continuous-batch process (Iranpour et al, 2006). This battery and its dedicated postdigestion train treated approximately 20% of the plant's feed sludge rate and were isolated from mesophilic plant operations (approximately 80% of the plant's feed sludge rate).…”

Section: Introductionmentioning

confidence: 99%

Full‐Scale Class A Biosolids Production by Two‐Stage Continuous‐Batch Thermophilic Anaerobic Digestion at the Hyperion Treatment Plant, Los Angeles, California

Iranpour

Cox²,

Fan³

et al. 2006

Water Environment Research

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The City of Los Angeles Hyperion Treatment Plant (HTP) (California) converted its anaerobic digesters to thermophilic operation to produce Class A biosolids. Phase IV tests demonstrated compliance of a two‐stage, continuous‐batch process with Alternative 1 of U.S. Environmental Protection Agency 40 CFR Part 503 (U.S. EPA, 1993), which defines the time–temperature requirement for batch treatment (T ≥ 56.3°C at 16‐h holding). Fecal coliforms, Salmonella sp., viable helminth ova, and enteric viruses were not detected in biosolids in the postdigestion train, including the truck‐loading facility and the farm for land application as the last points of plant control where compliance is to be demonstrated. The same results were achieved during Phase V tests, after lowering the second‐stage holding temperature to 52.6°C to reduce the elevated methyl mercaptan production that was observed during Phase IV. Hence, the Phase V process complied with Alternative 3 of 40 CFR Part 503. Currently, HTP operates its digesters under the same conditions as tested in Phase V. In 2003, monthly monitoring of the biosolids at the truck‐loading facility and the farm for land application demonstrated consistent compliance with Alternative 3.

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“…Temperature-Phased Anaerobic Digestion (TPAD) and Acid/Methane phased digestion emerged as the leading candidates, as research studies have indicated the potential of these processes to reduce pathogens. Laboratory studies conducted at the Nine Springs laboratory by Reusser et al (2001) found that TPAD was capable of higher volatile solids (VS) destruction with total detention times of 10 and 12.5 days than any of the other systems at 15 to 20 days. But MMSD recognized that it would need to operate the thermophilic stage of TPAD in a batch, sequential batch, or similar mode to ensure that "every particle" has been exposed to conditions stipulated under CFR Part 503 Regulations for Class A operational compliance.…”

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confidence: 99%

Design for Conversion of Digesters at Madison (Wi) MSD to Enable Sequential Batch Tpad

Fronek¹,

Santha²

2004

proc water environ fed

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In 1998, the Madison Metropolitan Sewerage District (MMSD) initiated facility planning for the 10 th addition to the 50 MGD Nine Springs Wastewater Treatment Plant (NSWWTP). The modifications comprised of several upgrades including a new headworks facility, modifications to the existing digestion process, and construction of new biosolids processing facilities, revisions to energy utilization and energy recovery facilities and other miscellaneous improvements. The anaerobic digestion facilities at the plant were included in the evaluation because the digester loadings were exceeding design values, resulting in a nominal 14-day solids retention time. The digester capacity related issues were being further accentuated by recurrent foaming problems in the gas-mixed digesters.Though not mandated, it was thought prudent to ensure Class A compliance with the capacityrelated digester improvements as increased public scrutiny and growing resistance to land application of Class B biosolids in many parts of the country have raised questions about the continued reliance on this practice. Temperature-Phased Anaerobic Digestion (TPAD) and Acid/Methane phased digestion emerged as the leading candidates, as research studies have indicated the potential of these processes to reduce pathogens. Laboratory studies conducted at the Nine Springs laboratory by Reusser et al. (2001) found that TPAD was capable of higher volatile solids (VS) destruction with total detention times of 10 and 12.5 days than any of the other systems at 15 to 20 days. But MMSD recognized that it would need to operate the thermophilic stage of TPAD in a batch, sequential batch, or similar mode to ensure that "every particle" has been exposed to conditions stipulated under CFR Part 503 Regulations for Class A operational compliance. Operation in a sequential-batch mode appeared to be a workable solution for meeting the time-temperature requirements for Class A pathogen reduction at NSWWTP. Lab-scale studies at Iowa State University sponsored by MMSD's design consultant, Black & Veatch, confirmed the stability and performance of the sequencing-batch TPAD scheme.With the critical process questions answered, the next task was working out the design details and completing plans and specifications for bidding the 10 th Addition project.

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Lab Scale Comparison of Anaerobic Digestion Alternatives

Cited by 3 publications

References 0 publications

Temperature conversion (mesophilic to thermophilic) of municipal sludge digestion

Temperature conversion (mesophilic to thermophilic) of municipal sludge digestion

Full‐Scale Class A Biosolids Production by Two‐Stage Continuous‐Batch Thermophilic Anaerobic Digestion at the Hyperion Treatment Plant, Los Angeles, California

Design for Conversion of Digesters at Madison (Wi) MSD to Enable Sequential Batch Tpad

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