Anaerobic Thermophilic/Mesophilic Dual-Stage Sludge Treatment

Cheunbarn, Tapana; Pagilla, Krishna

doi:10.1061/(asce)0733-9372(2000)126:9(796)

Cited by 47 publications

(18 citation statements)

References 12 publications

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“…A greater influence of P vacuum on SRF was obtained after ozone and alkaline treatments in both digesters (higher compressibility coefficient values); however, the thermal process led to similar values as the conventional operation. Thermophilic digested sludge had better dewatering properties with lesser dependence of the vacuum pressure than the mesophilic one, independent of the type of operation, as it is also reported in literature (Tapana and Pagilla 2000;Bivins and Novak 2001).…”

Section: Dewatering Propertiessupporting

confidence: 50%

Influence of Different Pretreatments on Anaerobically Digested Sludge Characteristics: Suitability for Final Disposal

Carballa

Omil

Lema

2008

Water Air Soil Pollut

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The debate on sludge recycling and disposal has been recently a target of growing interest due to the expressed concern about the potential risks of its agricultural use on human health and the environment. This fact has led to revisions in government policy and regulations and many novel treatment processes have been proposed in order to make the recycling and reuse of sewage sludge sustainable. In this work, the use of some pretreatments (alkaline, thermal, and ozonation) combined with conventional anaerobic digestion has been assessed on digested sludge quality in terms of pathogens, dewatering properties, heavy metals, and organic pollutants. All pretreatments proved to be efficient to reach the requirements proposed in the Working Document on Sludge prepared by the European Commission (CEC, Council Directive of 27 April 2000 on Working Document on Sludge-third draft. Brussels: European Commission DG Environment. Retrieved from http:// ec.europa.eu/environment/waste/sludge/pdf/sludge_en. pdf, 2000a) and also those established by the U.S. Environmental Protection Agency (EPA, Standards for the disposal and utilization of sewage sludge, part 503.

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Section: Dewatering Propertiessupporting

confidence: 50%

Influence of Different Pretreatments on Anaerobically Digested Sludge Characteristics: Suitability for Final Disposal

Carballa

Omil

Lema

2008

Water Air Soil Pollut

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“…Operating one or more stages at thermophilic temperatures has shown several potential advantages, such as higher reduction of volatile solids, higher biogas production and improved solids-liquid separation as well as the increased deactivation of pathogenic organisms [19][20][21]. However the thermophilic process is much more sensitive to temperature changes and variation of organic loading rates, as well as to the quality of the influent sludge.…”

Section: Introductionmentioning

confidence: 99%

Mesophilic-thermophilic fermentation process of waste activated sludge after hybrid disintegration

Grűbel

Machnicka

Nowicka

2014

Ecological Chemistry and Engineering S

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Abstract:The previously received results of individual processes of hydrodynamic and alkaline disintegration were decisive significant for the conducted research task. The combination of hydrodynamic cavitation (30 minutes duration of the process) and alkaline (pH ≈ 9) to the destruction of activated sludge caused a significant release of organic matter about 1383 mg/dm 3 in comparing to individual processes. Such increase in the SCOD value resulted in a significant growth the efficiency of biogas yield in a two-stage mesophilic-thermophilic processes. The increase in yield was from 26 to 38% depending on the volume of disintegrated sludge. The effect of the two-stage fermentation resulted activated sludge hygienisation. The microbiological analysis of the influence of the fermentation with the different volume of hybrid disintegrated sludge was based on microbiological indicators: Salmonella spp. and coliphages. The obtained results prove the effectiveness of the two-stage digestion process compared to single mesophilic fermentation which not always completely eliminates the above indicators.

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“…Allowing dual-stage anaerobic digestion to be economical to operate since the majority of the sludge stabilization is performed in the mesophilic stage (Cheunbarn and Pagilla 2000). Marneri et al (2009) investigated the foaming potential of dual-stage anaerobic digesters.…”

Section: Dual-stage Anaerobic Digestionmentioning

confidence: 99%

Foaming Phenomenon in Bench‐Scale Anaerobic Digesters

Siebels

Long

2013

Water Environment Research

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The Madison Metropolitan Sewerage District (The District) in Madison, Wisconsin has been experiencing seasonal foaming in their anaerobic biosolids digesters, which has occurred from mid‐November to late June for the past few years. The exact cause(s) of foaming is unknown. Previous research findings are unclear as to whether applications of advanced anaerobic digestion processes reduce the foaming potential of digesters. The object of this study was to investigate how configurations of thermophilic and acid phase‐thermophilic anaerobic digestion would affect foaming at the bench‐scale level compared to single stage mesophilic digestion for The District. Bench‐scale anaerobic digesters were fed with a 4 to 4.5% by dry weight of solids content blend of waste activated sludge (WAS) and primary sludge from The District. Foaming potential was monitored using Alka‐Seltzer and aeration foaming tests. The bench‐scale acid phase‐thermophilic digester had a higher foaming potential than the bench‐scale mesophilic digester. These results indicate that higher temperatures increase the foaming potential of the bench‐scale anaerobic digesters. The bench‐scale acid phase‐thermophilic digesters had a greater percent (approximately 5 to 10%) volatile solids destruction and a greater percent (approximately 5 to 10%) total solids destruction when compared to the bench‐scale mesophilic digester. Overall, for the full‐scale foaming experienced by The District, it appears that adding an acid phase or switching to thermophilic digestion would not alleviate The District's foaming issues.

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Anaerobic Thermophilic/Mesophilic Dual-Stage Sludge Treatment

Cited by 47 publications

References 12 publications

Influence of Different Pretreatments on Anaerobically Digested Sludge Characteristics: Suitability for Final Disposal

Influence of Different Pretreatments on Anaerobically Digested Sludge Characteristics: Suitability for Final Disposal

Mesophilic-thermophilic fermentation process of waste activated sludge after hybrid disintegration

Foaming Phenomenon in Bench‐Scale Anaerobic Digesters

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