Constructed wetlands for the removal of organic micropollutants from wastewater: Current status, progress, and challenges

Kushwaha, Anamika; Goswami, Lalit; Kim, Beom Soo; Lee, Sang Soo; Pandey, Sudhir Kumar; Kim, Ki-Hyun

doi:10.1016/j.chemosphere.2024.142364

Cited by 2 publications

(1 citation statement)

References 260 publications

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“…Furthermore, quantifying the EI in relation to PET depolymerization may lead to a sustainable circular society. LCA offers a mutual ground for analyzing the environmental influences of waste upcycling. − Various reports have assessed the potential of PET recycling or examined the end-of-life of PET via LCA . In addition, the EI matrix can be established by reforming LCA functional units, system boundaries, processing conditions, and input parameters for a broad range of polymers and recycling techniques. − …”

Section: Resultsmentioning

confidence: 99%

An Integrated Chemical and Biological Approach for Poly(ethylene terephthalate) Depolymerization and Biopolyol Production

Kushwaha,

Goswami,

Kim

2024

ACS Sustainable Chem. Eng.

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In this study, we established an innovative and integrated chemical/biological methodology for the complete poly(ethylene terephthalate) (PET) degradation and biopolyol production using cerium−iron oxide nanoparticles (CeFeNPs). Initially, three nanoparticles, i.e., CeNPs, FeNPs, and CeFeNPs, were synthesized and evaluated for PET glycolysis. CeFeNPs demonstrated the best catalytic performance for PET depolymerization to bis(2-hydroxyethyl) terephthalate (BHET) and were further recovered from the PET depolymerized slurry to be reutilized again. BHET was further biodegraded using the hydrocarbonoclastic bacterium Pseudomonas aeruginosa PR3 under the batch modes using a shake flask and a stirred tank bioreactor. To elucidate the fate of BHET biodegradation under aerobic conditions, identification of various BHET degraded metabolites was carried out using liquid chromatography−mass spectrometry analysis. The strain could produce an extracellular diol synthase enzyme, which transforms oleic acid into the biopolyol, 7,10-dihydroxy-8(E)octadecenoic acid (DOD). CeFeNPs were further supplemented to enhance DOD production via whole cell and cell-free approaches.

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Section: Resultsmentioning

confidence: 99%

An Integrated Chemical and Biological Approach for Poly(ethylene terephthalate) Depolymerization and Biopolyol Production

Kushwaha,

Goswami,

Kim

2024

ACS Sustainable Chem. Eng.

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Nature based solutions for removal of steroid estrogens in wastewater

Liyanage,

Lay,

Glasgow

et al. 2024

Front. Microbiol.

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Estrogens are a growing problem in wastewater discharges because they are continuously entering the environment and are biologically active at extremely low concentrations. Their effects on wildlife were first identified several decades before, but the environmental limits and the remedial measures are still not completely elucidated. Most conventional treatment processes were not designed with sufficiently long retention times to effectively remove estrogens. Nature-based wastewater treatment technologies such as treatment wetlands (TW) and high-rate algal ponds (HRAP) are economically feasible alternatives for decentralized wastewater treatment and have promise for removing steroid hormones including estrogens. For small communities with populations below 50,000, the overall cost of TWs and HRAPs is considerably lower than that of advanced decentralized treatment technologies such as activated sludge systems (AS) and sequencing batch reactors (SBR). This results from the simplicity of design, use of less materials in construction, lower energy use, operation and maintenance costs, and operation by non-skilled personnel. The nature-based technologies show high removal (>80%) for both natural and synthetic estrogens. Estrogen removal in TWs can be enhanced using alternative media such as palm mulch, biochar, and construction wastes such as bricks, instead of traditional substrates such as sand and gravel. While TWs are effective in estrogen removal, they have the disadvantage of requiring a relatively large footprint, but this can be reduced by using intensified multilayer wetland filters (IMWF). Using filamentous algae in HRAP (high-rate filamentous algal pond; HRFAP) is an emerging technology for wastewater treatment. The algae supply oxygen via photosynthesis and assimilate nutrients into readily harvestable filamentous algal biomass. Diurnal fluctuations in oxygen supply and pH in these systems provide conditions conducive to the breakdown of estrogens and a wide range of other emerging contaminants. The performance of these nature-based systems varies with seasonal changes in environmental conditions (particularly temperature and solar irradiation), however a greater understanding of operating conditions such as loading rate, hydraulic retention time (HRT), pond/bed depth, dissolved oxygen (DO) concentration and pH, which influence the removal mechanisms (biodegradation, sorption and photodegradation) enable TWs and HRAPs to be successfully used for removing estrogens.

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Constructed wetlands for the removal of organic micropollutants from wastewater: Current status, progress, and challenges

Cited by 2 publications

References 260 publications

An Integrated Chemical and Biological Approach for Poly(ethylene terephthalate) Depolymerization and Biopolyol Production

An Integrated Chemical and Biological Approach for Poly(ethylene terephthalate) Depolymerization and Biopolyol Production

Nature based solutions for removal of steroid estrogens in wastewater

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