Activated sludge degradation of adipic acid esters

Saeger, Victor W.; Kalley, R. G.; Hicks, Orville; Tucker, E. S.; Mieure, James P.

doi:10.1128/aem.31.5.746-749.1976

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Recovery of the desorbed dye and its reuse ensued upon evaporation of the methanol solution. The spent BMA after several adsorption–desorption cycles could be easily disposed as both the precursors are biodegradable. , We presume that the disposal of the spent adsorbent will not be hazardous to the environment. Hence, the overall process is environment friendly and mitigates waste disposal problems.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Melaminium Adipate Lamellae for Adsorptive Removal of Anionic Dyes from Wastewater

Johnson

Saha

Chhetri

et al. 2021

ACS Appl. Polym. Mater.

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The growth in industrialization worldwide has resulted in continual discharge of organic dyes that contaminate the aquatic ecosystem. Common adsorbents employed for dye removal are often expensive and non-biodegradable, causing a problem of secondary waste generation on their disposal. Thus, the design of biocompatible, economical adsorbents is of utmost importance. Bis(melaminium)adipate adipic acid solvate (BMA), an ionic organic material, was synthesized from commercially available melamine and adipic acid. Extensive hydrogen bonding stabilizes BMA sheets that are interlinked by lattice adipic acid molecules, resulting in the lamellar morphology. Though BMA is electrically neutral, positive zeta (ζ)-potential, due to the presence of melaminium moieties on the surface, aids in the adsorptive removal of anionic dyes from wastewater. BMA demonstrated a preference for the adsorption of anionic dyes irrespective of the solution pH, owing to the availability of multiple protonation–deprotonation sites. The Freundlich isotherm model proved to be suitable in describing the equilibrium adsorption of Congo red, owing to the surface heterogeneity in BMA. The adsorbed dye could be recovered and reused, as dye desorption ensued in methanol at room temperature. BMA is reusable for several adsorption–desorption cycles. Its biodegradability ensures that the spent adsorbent is not detrimental to the environment. Thus, the wastewater treatment with BMA generates minimal waste, underlining its viability in practical effluent management.

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Section: Resultsmentioning

confidence: 99%

Self-Assembled Melaminium Adipate Lamellae for Adsorptive Removal of Anionic Dyes from Wastewater

Johnson

Saha

Chhetri

et al. 2021

ACS Appl. Polym. Mater.

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Relative rates and mechanisms of biodegradation of diester plasticizers mediated by Rhodococcus rhodochrous

2009

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Di-ester plasticizers undergo slow degradation resulting in the release of recalcitrant, toxic metabolites in the environment. It is demonstrated here that the first and rate-limiting step in their co-metabolism by Rhodococcus rhodochrous is the hydrolysis of one ester bond. This mechanism is different than one proposed earlier for direct biodegradation of di-2-ethylhexyl phthalate. Also, using butyl butyrate as a reference compound to compare the relative rates of hydrolysis of different di-ester plasticizers, biodegradation rates were found to be strongly influenced by steric hindrances and solubility. Esterase activity associated with the hydrolysis of these bonds was located in the envelope of the bacterial cell. The esterase activity was not induced by specific substrates and was detected at all stages of growth. These considerations are important for the hydrolysis of recalcitrant plasticizers by a process of co-metabolism, which leads to a slow but steady overall rate of biodegradation. This suggests that as the growing reservoir of plasticizers in the environment slowly undergoes biotransformation, recalcitrant toxic metabolites will be continuously released.Les plastifiants diester subissent une dégradation lenteà la suite du rejet de métabolites toxiques récalcitrants dans l'environnement. Il aété démontré dans ces pages que la premièreétape, cinétiquement limitante, de leur cométabolisme par la bactérie Rhodococcus rhodochrous est l'hydrolyse d'une liaison ester. Ce mécanisme est différent de celui proposé précédemment concernant la biodégradation directe du phtalate d'éthyl-2-hexyle. Aussi, en employant le butyrate de butyle comme composé de référence afin de comparer les vitesses relatives de l'hydrolyse de différents plastifiants diester, on a observé que les vitesses de biodégradationétaient fortement influencées par les encombrements stériques et la solubilité. L'activité de l'estérase liéeà l'hydrolyse de ces liaisons se situait dans l'enveloppe de la cellule bactérienne. L'activité de l'estérase n'a pasété induite par des substrats particuliers et aété détectéeà toutes lesétapes de la croissance. Ces considérations sont importantes en vue de l'hydrolyse de plastifiants récalcitrants au moyen d'un procédé de cométabolisme, qui permet d'obtenir une vitesse de biodégradation lente, mais stable dans l'ensemble. Cette observation porteà croire que tant et aussi longtemps que le bassin croissant de plastifiants rejetés dans l'environnement sera soumisà une biotransformation lente, il y aura rejet perpétuel de métabolites toxiques récalcitrants.

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Occurrence of phthalates in aquatic environment and their removal during wastewater treatment processes: a review

Gani

Tyagi

Kazmi

2017

Environ Sci Pollut Res

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Phthalates are plasticizers and are concerned environmental endocrine-disrupting compounds. Due to their extensive usage in plastic manufacturing and personal care products as well as the potential to leach out from these products, phthalates have been detected in various aquatic environments including drinking water, groundwater, surface water, and wastewater. The primary source of their environmental occurrence is the discharge of phthalate-laden wastewater and sludge. This review focuses on recent knowledge on the occurrence of phthalate in different aquatic environments and their fate in conventional and advanced wastewater treatment processes. This review also summarizes recent advances in biological removal and degradation mechanisms of phthalates, identifies knowledge gaps, and suggests future research directions.

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Activated sludge degradation of adipic acid esters

Cited by 6 publications

References 10 publications

Self-Assembled Melaminium Adipate Lamellae for Adsorptive Removal of Anionic Dyes from Wastewater

Self-Assembled Melaminium Adipate Lamellae for Adsorptive Removal of Anionic Dyes from Wastewater

Relative rates and mechanisms of biodegradation of diester plasticizers mediated by Rhodococcus rhodochrous

Occurrence of phthalates in aquatic environment and their removal during wastewater treatment processes: a review

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