Features of gas excretion in wastewater treatment processes by the method of electroflotation

Evgeny Alekseev ,Nadezhda А Stashevskaya

doi:10.1051/matecconf/201825103021

Abstract

The method of wastewater treatment by electroflotation is based on the electrochemical process of obtaining a gas dispersion. Features of the chemical composition of wastewater affect the electrochemical processes of water decomposition and the excretion of electrolysis gases. The aim of the research was to study the regularities of the separation of electrolysis gases from the ratio of the areas of polar electrodes and the value of the active reaction of the treated water (pH). It is established that the optimum value of the ratio of the electrode areas (fa : fc) close to 1. The value of the current density at the electrodes is recommended to take in 150 – 200 A/m2. An increase in the current density leads to heating of the liquid and an over-expenditure of electricity. The greatest influence of the pH of wastewater on the process of gas excretion is noted in the acidic medium. The gas yield is independent of the pH value in neutral and alkaline media. The gas yield remains practically unchanged with a current density of more than 150 A/m2 over the entire range of pH changes from 2 to 12.

Highlights

Electrochemical methods of wastewater treatment have a number of advantages and have become widespread in various industries [1,2,3,4,5]
A noticeable effect of the ratio of the electrodes areas to the gas yield occurs in the current density range of 85 to 150 A/m2
When designing the electroflotation installations it is necessary to take into account that the ratio of the areas of polar electrodes does not significantly affect the amount of gas excretions, which is due to the low dissipative capacity of wastewater

Summary

Introduction

Electrochemical methods of wastewater treatment have a number of advantages and have become widespread in various industries [1,2,3,4,5]. The prospects of its use have been established as a result of researches of the effectiveness of this method of wastewater treatment [6, 7]. This is especially important for remote areas, the issues of environmental protection in which the use of simple and reliable methods of wastewater treatment is required. The basis of electroflotation is the process of electrochemical reception of the gas dispersion in the treated water [8]

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