Changes in Dewatering Properties Between the Thermophilic and Mesophilic Stages in Tpad Systems

Novak, John T.; Bivins, Jason L.

doi:10.2175/193864700784544514

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…In a separate paper, Murthy et al (2000b) reported that the polymer requirements of biosolids treated using the autothermal thermophilic aerobic digestion (ATAD) process were higher than polymer requirements for dewatering of biosolids treated using mesophilic aerobic digestion. Novak and Bivins (2000) conducted a laboratory scale study on the dewaterability of two-phase digested sludge.…”

Section: Thickening Conditioning and Dewateringmentioning

confidence: 99%

Biosolids and Sludge Management

Baldwin¹,

Call²,

Danalewich³

et al. 2001

Water Environment Research

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The following literature review covers journal articles related to biosolids and sludge management that were published in 2000. The main topics covered include regulations and planning, reduction of biosolids and sludge production, biosolids and sludge characteristics, thickening, conditioning and dewatering, thermal processes, land application, alternative uses for biosolids, disposal, and articles relating to overall biosolids programs. These topics have been generated by increased regulations and scrutiny of biosolids programs, and the need for continued research and education in the field of biosolids management. REGULATIONS AND PLANNINGConcerns over possible health effects resulting from sludge land application use have reportedly initiated discussions between the EPA and the National Academy of Sciences. Rennier (2000) reported that the EPA may be interested in re-evaluating the 503 regulations. This re-evaluation would focus on human health issues, risk assessment, and ecological issues. Canning (2000) discussed the EPA's proposed dioxin standard of 300 ppt of toxic equivalent for biosolids used in land application.This will effect many treatment plants that exceed these limits indicating that they will be required to find alternative methods of disposal. Conrad (2000) stated that Section 503 regulations are not working, citing examples of improper use of sewage sludge and numerous non-protective aspects of the current standards. Three recommendations were proposed for enhancing Section 503 safeguards: 1) enforce more rigorous monitoring requirements; 2) require limits on infrequently occurring metals and biological contaminants; and 3) increase public awareness and notice of treated land, and universal labeling of sewage sludge products. Birchfield and Stetar (2000) indicated that traditional biosolids handling and disposal methods such as dewatering or incineration can concentrate radionucleotides. The proper management of the land

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Section: Thickening Conditioning and Dewateringmentioning

confidence: 99%

Biosolids and Sludge Management

Baldwin¹,

Call²,

Danalewich³

et al. 2001

Water Environment Research

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Effect of hydraulic retention time on the methanogenic step of a two-stage anaerobic digestion system from sewage sludge and wine vinasse: Microbial and kinetic evaluation

Tena

Pérez

Solera

2021

Fuel

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Laboratory‐Scale Comparison of Anaerobic‐Digestion Alternatives

Reusser

Zelinka²

2004

Water Environment Research

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Laboratory‐scale digesters were used to perform side‐byside evaluations of alternative digestion systems including thermophilic– mesophilic‐phased digestion (TPAD), acid/methane‐phased digestion, mesophilic digestion, and the performance of the thermophilic stage of TPAD alone. Total detention times in the systems evaluated varied from 8 to 20 days. Temperatures in the mesophilic stage of TPAD were varied from 35 to 43.3°C and temperatures in the thermophilic stage were varied from 55 to 58.9°C. The purpose of the study was to evaluate volatile solids (VS) reduction and thickening properties of the different systems. Parameters evaluated included solids, volatile acids, gas production and quality, various chemical constituents of the sludge, and thickening properties using polymer and ferric chloride plus polymer. The TPAD systems were found capable of higher VS destruction at total detention times of 10 and 12.5 days compared to single‐stage mesophilic or thermophilic digestion at 15 to 20 days. A laboratory‐scale thickening test was performed to evaluate thickening properties. Based on obtaining 95% capture in the test, the polymer demand of mesophilic and acid–methane‐phased digestion was the lowest. The TPAD system required approximately 180% of the dosage of the mesophilic sludge and thermophilic sludge required approximately 310% of the dosage. Temperatures of 40.5 and 43.3 8 C in the mesophilic stage of TPAD were found to increase the polymer requirement and decrease the VS reduction of the TPAD system. Higher temperatures (above 56.1°C) and lower detention times (less than 15 days) in the thermophilic digesters seemed to result in problems with degradation of volatile acids, particularly propionic acid. Water Environ. Res., 76, 360 (2004).

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Changes in Dewatering Properties Between the Thermophilic and Mesophilic Stages in Tpad Systems

Cited by 4 publications

References 12 publications

Biosolids and Sludge Management

Biosolids and Sludge Management

Effect of hydraulic retention time on the methanogenic step of a two-stage anaerobic digestion system from sewage sludge and wine vinasse: Microbial and kinetic evaluation

Laboratory‐Scale Comparison of Anaerobic‐Digestion Alternatives

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