Publications by authors named "Monika Dubey"

Unlabelled: In the present study, CeO nanoparticles were synthesized using one-pot green route with high yield using microalgae The synthesized CeO nanoparticles (CeO-np) exhibited rapid photocatalytic degradation 98.2% of doxycycline (DC) (20 mg/L) in only 30 min under visible light at pH7 in water. It was encouraging that CeO-np did not demonstrate a loss of photocatalytic activity up to five repeated cycles, confirming its stability during the degradation process.

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Emerging contaminants (ECs) in the environment are a cause of concern due to their potential toxic effects. The study investigates the fate of 20 ECs covering a wide range of physical-chemical properties in ten full-scale municipal wastewater treatment plants (WWTPs). The plants were based on conventional technologies such as waste stabilization pond, upflow sludge blanket reactor, activated sludge process, and biological nutrient removal-based technologies such as anoxic-aerobic process, anaerobic-anoxic-aerobic process, biodenipho process, sequencing batch reactor, and densadeg-biofor process.

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The study aims to understand the occurrence and removal of 20 emerging contaminants (ECs) in each unit process of a sequencing batch reactor-based wastewater treatment plant (WWTP) and explore the potential of biological activated carbon (BAC) for the treatment of residual ECs and organic matter in the secondary effluent. Analgesic-acetaminophen, anti-inflammatory drug-ibuprofen, and stimulant-caffeine were detected at high concentrations in the influent. Most of the removal was observed in the biological treatment stage in the SBR basins.

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Emerging contaminants (ECs) are a growing concern for the environment and human health. The study investigates 20 commonly reported ECs in 10 wastewater treatment plants (WWTPs) in urban to semi-urban settlements of north India over two years in the summer and winter. The selected plants were based on waste stabilization pond (WSP), up-flow anaerobic sludge blanket (UASB), activated sludge process (ASP), anoxic-aerobic process (AO), anaerobic-anoxic-oxic process, biodenipho process, sequencing batch reactor, and densadeg-biofor process.

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Biodegradation of terephthalate (TPA) is a highly desired catabolic process for the bacterial utilization of this polyethylene terephthalate (PET) depolymerization product, but to date, the structure of terephthalate dioxygenase (TPDO), a Rieske oxygenase (RO) that catalyzes the dihydroxylation of TPA to a -diol, is unavailable. In this study, we characterized the steady-state kinetics and first crystal structure of TPDO from Comamonas testosteroni KF1 (TPDO). TPDO exhibited substrate specificity for TPA (/ = 57 ± 9 mM s).

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The study investigates the fate of 20 contaminants of emerging concern (CECs) in two full-scale wastewater treatment plants (WWTPs) based on the Biodenipho™ (WWTP 1) and anaerobic-anoxic-oxic (WWTP 2) processes. Samples of both the dissolved and solid phases (particulate and sludge) from all the wastewater and sludge processing-related units were studied using the mass balance approach to understand the distribution of CECs. The total mass load removal efficiency for anti-inflammatory (4), antibiotics (4), and hormones (5) was 76, 46, 93%, and 72, 38, 90% from WWTP 1 and 2, respectively.

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Management of agro-waste is a major challenge globally due to inefficient disposal techniques, which concominantly leads pollution and loss of renewable bioenergy. Anaerobic digestion of agro-waste is one of the ways to tackle this problem but hindered by the recalcitrant nature of agro-waste. This study investigated the effect of granular activated carbon (GAC) and granular biochar (GBC) addition to enhance the thermophilic anaerobic co-digestion of wheat husk and sewage sludge.

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Article Synopsis
  • Sewage treatment plants produce a lot of sludge that can be harmful to the environment because it contains new kinds of pollutants called emerging contaminants (ECs).
  • Different treatment methods like anaerobic digestion, composting, and heat are used to help break down these contaminants in sludge.
  • Key factors like pH level, type of sludge, and the chemical makeup of the pollutants affect how well the ECs can be removed during the treatment process.
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Pharmaceuticals, personal care products, synthetic hormones, and industrial manufacturing additives are used worldwide, and their residues are frequently detected in wastewater. In this study, a sensitive and selective method was developed and validated for the detection and quantification of 14 Emerging Contaminants (ECs) with various physico-chemical properties frequently found in wastewater. Solid Phase Extraction (SPE) allowed for extraction and concentration of the compounds.

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