The role of chemical oxidation in combined chemical-physical and biological processes: experiences of industrial wastewater treatment

Abstract

In this work, some experiences are described concerning the application of chemical oxidation in the treatment of industrial wastewaters in combination with other chemical-physical and/or biological processes. In the first case, two different wastewaters from saturated and unsaturated polyester resin production were considered. In a second case, optimal process conditions were assessed for the treatment of a wastewater deriving from polystyrene production. A third experience dealt with a comparison among different processes (flocculation, Fenton process, ozonisation, oxidation by means of ozone and hydrogen peroxide, oxidation by means of hydrogen peroxide and UV radiation), for the pretreatment of two industrial wastewaters (the first one being produced in a textile factory, the second one coming from detergent manufacturing). The evaluation of different processes was carried out by means of laboratory scale tests, considering treatment efficiency (organic substance removal, changes in wastewater biodegradability) and parameters (chemicals and energy consumption, sludge production) which play an important role in cost determination.

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

“…These drawbacks can be overcome by using heterogeneous Fenton-type catalysts, in particular, zeolites, whose recovery from water is not difficult. Iron and copper containing zeolites show redox properties because these metals can change their oxidation states [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Recently, high catalytic activity of iron containing zeolites for phenol oxidation [15,16] and for degradation of dyes [2,3] has been reported.…”

Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

“…The complete mineralization of organic pollutants is the safest method to the environment, and some technologies, such as biotechnology and chemical oxidations, have been studied for or applied to the treatment of organic pollutants in water, atmosphere or soil [1,2]. But some of the contaminants such as aromatic halide or nitro aromatic substance and dyes have adequate resistance to oxidation by bio-degradation and conventional chemical oxidation.…”

Natural Treatment of Woolen Processing Industry Wastewater

“…In the literature up to now, in order to determine treatment processes and methods, conventional treatment processes such as coagulation/flocculation process [3], chemical/physical oxidation [4], activated sludge [5,6] and adsorption [7] and advanced treatment methods such as advanced oxidation [8], membrane process [9], Fenton process [10], electrochemical oxidation [11], electrolytic treatment [12] and reverse osmosis [13] have been applied.…”