Analysis and characterization of MEA effluent from power plants in a biological sludge process

Jun T.H., . and Nam S.H., . and Mi H.Y., . and In H.R., . and Daechul C., . and Hyun J.J., . and Hyun K.A., . (2006) Analysis and characterization of MEA effluent from power plants in a biological sludge process. [Proceedings Paper]

Monoethanolamine MEA used as corrosion inhibitor detergent component or chemical intermediate has been a strong pollutant in water streams and gone further to be an vital factor in soil subsurface and ground water environments. In particular various power plants use or are going to use substantial amount of MEA in their water circulation system in near future. This paper therefore attempted to analyze MEA and its fate under its biological pathways which might be a potential problems. We used Ion Chromatography Metrohm 761 compact IC Swiss with a cation column YK-421 Shodex Japan and an anion column SI-90 4E Shodex Japan and applied HPLC Futecs VP2500 Korea for the intermediates of MEA decomposition. The biological decomposition of MEA was performed in a 10L-working volumed batch aeration tank a continuous stirred tank reactor with two air spargers 20L of working volume and 500-ml flasks. All equipment was tightly sealed to prevent vaporization of MEA. Also the solution pH was maintained at or under 7.0 for all experiments. Tested MEA concentrations ranged from 1 000 mg/I to 6 000 mg/I which is known to be the toxicity threshold of Pseudomonas putidas. The biological degradation rates were 13.9 mg/I h for the batch reactor 12.1 mg/I h for the CFSTR and 10.4 mg/I h for the flask culture respectively. The pH values kept decreasing down to 5.5 even from 12 or higher initially. As of previous reports the intermediates of biological degradation of MEA such as acetate ethanol and ammonium were all identified via HPLC and IC analysis. Currently we are in search of what stages the intermediates would form in that is plausible pathways of MEA degradation in mixed microbial consortium. In addition this biological kinetics are being compared to two AOP Advanced Oxidation Process methods: photolysis by ultraviolet light and ultrasonic irradiation.

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Abstract

Monoethanolamine MEA used as corrosion inhibitor detergent component or chemical intermediate has been a strong pollutant in water streams and gone further to be an vital factor in soil subsurface and ground water environments. In particular various power plants use or are going to use substantial amount of MEA in their water circulation system in near future. This paper therefore attempted to analyze MEA and its fate under its biological pathways which might be a potential problems. We used Ion Chromatography Metrohm 761 compact IC Swiss with a cation column YK-421 Shodex Japan and an anion column SI-90 4E Shodex Japan and applied HPLC Futecs VP2500 Korea for the intermediates of MEA decomposition. The biological decomposition of MEA was performed in a 10L-working volumed batch aeration tank a continuous stirred tank reactor with two air spargers 20L of working volume and 500-ml flasks. All equipment was tightly sealed to prevent vaporization of MEA. Also the solution pH was maintained at or under 7.0 for all experiments. Tested MEA concentrations ranged from 1 000 mg/I to 6 000 mg/I which is known to be the toxicity threshold of Pseudomonas putidas. The biological degradation rates were 13.9 mg/I h for the batch reactor 12.1 mg/I h for the CFSTR and 10.4 mg/I h for the flask culture respectively. The pH values kept decreasing down to 5.5 even from 12 or higher initially. As of previous reports the intermediates of biological degradation of MEA such as acetate ethanol and ammonium were all identified via HPLC and IC analysis. Currently we are in search of what stages the intermediates would form in that is plausible pathways of MEA degradation in mixed microbial consortium. In addition this biological kinetics are being compared to two AOP Advanced Oxidation Process methods: photolysis by ultraviolet light and ultrasonic irradiation.

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Item Type:	Proceedings Paper
Additional Information:	4 ills. 3 tables. 11 refs.
AGROVOC Term:	IONS
AGROVOC Term:	CHROMATOGRAPHY
AGROVOC Term:	BIODEGRADATION
AGROVOC Term:	ACTIVATED SLUDGE
AGROVOC Term:	WASTEWATER
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/17018

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