English
Русский SORPTION PROPERTIES OF BLACK SOLDIER FLY (HERMETIA ILLUCENS) MAGGOTS VERMICULTURING ZOOCOMPOST TO «METHYL ORANGE» DYE
Abstract
The paper considers the issues, concerned with possible release as part of sewage waters of an organo-mineral pollutant ‒ methyl orange dye – to the environment. This dye has become widely used in textile industry, food industry, and in building materials production. High concentrations of this dyestuff are toxic and can cause damage to skin and eyes. Getting into the body system, the dye can form even more toxic aromatic amines in course of metabolic processes. The toxic effect can occur even at 5% concentration of the dye.
To reduce the toxic influence of wastewaters, containing dyestuffs such as methyl orange, various purification methods are used, including sorption. To increase the cost-effectiveness of the process, the sorbents, based of various industrial wastes, have found application lately. In the present research the material, based on black soldier fly (Hermetia Illucens) maggots’ vermiculture, was used.
According to experimental findings and the adsorption isotherm, the type of the sorption material’s pores and the type of sorption were determined. It has been demonstrated that the sorption material belongs to transition-porous sorbents, which is essential for extracting large molecules of the dye. According to the isotherm, the dye molecules sorption proceeds in stages: at first, a monolayer is formed, which is indicated by the first plateau in the isotherm. At the second stage, a multilayer in the form of dye molecules’ chains or clusters – the second plateau in the isotherm – is formed. The sorption mechanism is predetermined by the specific composition of zoocompost particles. Zoocompost is rich in humic compounds with such functional groups as ‒NH, ‒OH, ‒C=O. The presence of these groups makes it possible to adsorb anionic dyes, including methyl orange dye, due to electrostatic interactions or hydrogen bonding.
The influence of the sorbent’s weight, particles size, reaction mix temperature, duration of sorption process on methyl orange dye removal degree was studied. The sufficient efficiency of the process up to 90% was demonstrated.
To reduce the toxic influence of wastewaters, containing dyestuffs such as methyl orange, various purification methods are used, including sorption. To increase the cost-effectiveness of the process, the sorbents, based of various industrial wastes, have found application lately. In the present research the material, based on black soldier fly (Hermetia Illucens) maggots’ vermiculture, was used.
According to experimental findings and the adsorption isotherm, the type of the sorption material’s pores and the type of sorption were determined. It has been demonstrated that the sorption material belongs to transition-porous sorbents, which is essential for extracting large molecules of the dye. According to the isotherm, the dye molecules sorption proceeds in stages: at first, a monolayer is formed, which is indicated by the first plateau in the isotherm. At the second stage, a multilayer in the form of dye molecules’ chains or clusters – the second plateau in the isotherm – is formed. The sorption mechanism is predetermined by the specific composition of zoocompost particles. Zoocompost is rich in humic compounds with such functional groups as ‒NH, ‒OH, ‒C=O. The presence of these groups makes it possible to adsorb anionic dyes, including methyl orange dye, due to electrostatic interactions or hydrogen bonding.
The influence of the sorbent’s weight, particles size, reaction mix temperature, duration of sorption process on methyl orange dye removal degree was studied. The sufficient efficiency of the process up to 90% was demonstrated.