Abstract
Monoethanolamine (MEA) solutions are widely used in for gas cleaning from carbon dioxidefor many industrial purposes. Spent MEA solutions should be properly decontaminated andsafely disposed. As these processes proceed at high temperature, the MEA solutions produceand accumulate tars and other degradation products as well as heavy metals from thecorroding equipment.This report presents a biological method for the detoxification of spent MEA solutions. Asolution is mixed with soil in order to inoculate aerobic microorganisms decomposing organicsubstances; and the obtained substrate is spread on a flat and properly hydro-isolated ground.To strengthen the vitality and increase activity of the microorganisms, the substrate is aerated,humidified, fertilized and its pH is monitored and controlled. When the MEA concentration isreduced, vascular plants (Calamagrostis epigejos, Secale cereale, Salix viminalis) areimplanted in the substrate, and their growth concludes the detoxification.
Highlights
Organic amines and especially monoethanolamine (MEA) and its solutions are widely used in gas cleaning from carbon dioxide for many industrial purposes
For bioremediation we prepared a substrate from a humus rich soil, two kinds of peat, peat and sand, The substrates were mixed with spent MEA solutions in proportion: I: 0; 1:2; 1:5; I: IO; 1:20; I:40, 3.4
The measurements of the intensity of respiration obtained from the data on the evolved CO2 that was estimated by sorption in NaOH solution and titration the remaining concentration of alkali by the HCI standard solution showed the vitality of microorganisms, 3.6
Summary
Organic amines and especially monoethanolamine (MEA) and its solutions are widely used in gas cleaning from carbon dioxide for many industrial purposes As these processes proceed at high temperature (> 205 °C) in the presence of iron which is a catalyst for many oxidative destruction reactions [I], the MEA solutions produce and accumulate the products of disintegration and tarring as well as heavy metals from the corroding equipment. The remaining solution is fractionated into three parts: the first one, which contains 10-15% ofMEA, is returned to distillation, the second one, which contains about 99% of MEA, may be used as a commercial product and the third one, containing tars and 1-5%MEA after vacuum distillation and neutralization may be utilized in fur industry as an auxiliary mean for technological fur treatments The shortcoming of this technology is that not all nitrogen-containing substances are used properly and no detoxification of heavy metals occurs.
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