Response of dairy waste activated sludge to experimental conditions affecting pH and dissolved oxygen concentration

Adamse, A. D.

doi:10.1016/0043-1354(68)90042-0

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…This result was in accordance with those of Adamse [4] and Caunt et al [11]. In addition, appreciable amounts of propanoic and butanoic acids were found here, accompanied by traces of pentanoic and isobutanoic acids ( Figure 6).…”

Section: Production Of Organic Acids Intermediatessupporting

confidence: 81%

“…A linear regression correlation was found for each reactor: These relations indicated that the treated wastewater presented a residual substrate concentration containing acids but also another organic fraction. This later can be associated to the protein fraction of the effluent that undergoes decomposition more slowly than the sugars [4]. The residence time used in this experiment was may be too short to obtain a good degradation of complex proteins.…”

Section: Residual Substrate Concentrationmentioning

confidence: 99%

“…Consequently, the effect of aeration rate was suspected. Adamse et al [4], showed that with dairy waste activated sludge, high aeration rates did not prevent the pH decrease obtained when high substrate concentration was imposed. However, restoring of the pH to its initial values was accelerated at high aeration rates.…”

Section: Kinetics Of Cod Degradation: Influence Of Aeration Ratesmentioning

confidence: 99%

“…Considering this latter parameter, Adamse [4] studied the effect of aeration rate and pH on response of dairy waste activated sludge, Orhon et al [1] the biological treatability of confectionary wastewaters by respirometric techniques, Ugwanyi et al [5] the inhibition of thermophilic aerobic treatment of agricultural wastes, and De Anda et al [6] the efficiency of protein production with E. coli.…”

Section: Introductionmentioning

confidence: 99%

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Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters

Lay-Son¹

2013

J Civil Environ Eng

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The treatment of confectionary wastewaters by a biological aerobic treatment plant encountered strong failures when wastewaters concentration exceeded 30 g/l of chemical oxygen demand (COD), although the COD inlet flow remained under design specifications. Treatment performances stayed under 50%, and strong acid production and Hydrogen potential drop lead to heavy corrosion of equipments.During a laboratory scale study using the same organic load, with residence times ranging from 1 to 15 days, Hydrogen potential (pH) drop proved to be caused mainly by aerobic production of organic acids from sugars, leading thus to an auto-inhibiting process. The study demonstrated the influence of pH, acids and aeration rate upon key parameters as respiration rates and degradation kinetics. A reduction of 30 to 35 g/l of COD was obtained in laboratory scale reactors with pH and oxygen control.A comparison between the laboratory scale reactors and the full scale plant was made by measuring in the reactors the clean water oxygenation transfer rates and comparing its values to the data issuing from the plant.Compared to the data issuing from the full-scale wastewater treatment plant, the results of this study allowed giving recommendations for its upgrade.

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Section: Production Of Organic Acids Intermediatessupporting

confidence: 81%

Section: Residual Substrate Concentrationmentioning

confidence: 99%

Section: Kinetics Of Cod Degradation: Influence Of Aeration Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters

Lay-Son¹

2013

J Civil Environ Eng

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“…Experiments with dairy waste activated sludge carried out by Adamse (1968b) under conditions of discontinuous substrate supply, showed that dissimilation of the carbohydrate fraction of the dairy waste started immediately upon addition to the activated sludge suspension. This was demonstrated by a sharp decrease of the amount of dissolved oxygen.…”

Section: Dynamics Of Cod Removalmentioning

confidence: 99%

Studies on bacterial activities in aerobic and anaerobic waste water purification

Adamse

Deinema

Zehnder

1984

Antonie van Leeuwenhoek

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Some aspects of the bacteriology of aerobic and anaerobic waste water purification are discussed in view of current opinions and recent developments in the technology of waste water treatment. Various contributions of scientific workers attached to the Department of Microbiology of the Agricultural University, Wageningen, during the past 65 years are summarized. Besides, present investigations are described and research activities in future indicated.

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Relationship between bulking and physicochemical–biological properties of activated sludges

Beccari¹,

Mappelli

Tandoi

1980

Biotech & Bioengineering

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SummaryResearch into bulking in laboratory-scale activated-sludge plants are reported upon. A correlation between sludge volume index (SVI) and hiopolymrr content (exocellular polymer, ECP) has been determined for sludge obtained under various operating conditions and with different chemical and physical characteristics. This paper interprets that correlation. A method for ECP determination that is quicker and just as precise as the gravimetric one and which enables this parameter to be used not only to interpret bioflocculation mechanisms but also as a parameter for evaluating optimal plant operation is reported. STATE OF KNOWLEDGEAlthough several types of sludge exist (whose behavior sometimes poses considerable problems for a satisfactory liquid-solid separation in settling tanks),' the term filamentous bulking should be strictly used only for phenomena that result in activated sludge having a significant percent of filamentous microorganisms and. consequentially, poor compaction properties.From an examination of bulking experiments carried out on various types of substrates in laboratory or full-scale plants, it would appear that the principal factors involved in bulking are a) The dissolved oxygen concentration in the mixed liquor. The critical dissolved oxygen value increases proportionally with the average floc diameter. However, values lower than 0.5-1 mgiliter do seem to cause the filamentous microorganisms to d e v e l~p .~-~ b) The flow-dynamic conditions. The sludge obtained in plants with plug-flow systems contain different percents of filamentous microorganisms than the sludge obtained in completely mixed reactors operating under the same conditions.6-8

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Response of dairy waste activated sludge to experimental conditions affecting pH and dissolved oxygen concentration

Cited by 12 publications

References 3 publications

Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters

Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters

Studies on bacterial activities in aerobic and anaerobic waste water purification

Relationship between bulking and physicochemical–biological properties of activated sludges

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