Several industries are using dyes as coloring agents. The effluents from these industries are increasingly becoming an environmental problem. The removal of dyes from aqueous solution has a great potential in the field of environmental engineering. This paper reviews the classification, characteristics, and problems of dyes in detail. Advantages and disadvantages of different methods used for dye removal are also analyzed. Among these methods, Fenton process-based advanced oxidation processes are an emerging prospect in the field of dye removal. Fenton processes have been classified and represented as “Fenton circle”. This paper analyzes the recent studies on Fenton processes. The studies include analyzing different configurations of reactors used for dye removal, its efficiency, and the effects of various operating parameters such as pH, catalyst concentration, H2O2 concentration, initial dye concentration, and temperature of Fenton processes. From the present study, it can be conclude that Fenton processes are very effective and environmentally friendly methods for dye removal.

Degradation of dyes from aqueous solution by Fenton processes: a review

Removal of natural organic matter in drinking water treatment by coagulation: A comprehensive review

Review on the main advances in photo-Fenton oxidation system for recalcitrant wastewaters

Optimization of the coagulation-flocculation process for pulp mill wastewater treatment using a combination of uniform design and response surface methodology

Abstract In the past few years, there have been many researches on the use of different types of homogenous catalyst for the degradation of textile wastewater in conventional advanced oxidation processes (AOPs). However, homogenous AOPs suffer from few limitations, including large consumption of chemicals, acidic pH, high cost of hydrogen peroxide, generation of iron sludge, and necessity of post-treatment. Therefore, recently, there have been more researches that focus on improving the performance of conventional AOPs using heterogeneous catalysts such as titanium dioxide, nanomaterials, metal oxides, zeolite, hematite, goethite, magnetite, and activated carbon (AC). Besides, different supports such as AC that have been incorporated with transition metals and clays have been proven to have excellent catalytic activity in AOPs. This paper presents a comprehensive review of advances and prospects of catalytic AOPs for the decontamination of a wide range of synthetic and real textile wastewater. This review provides an up-to-date critical review of the information on the degradation of various textile dyes by a wide range of heterogeneous catalysts and adsorbents. The future challenges of AOPs, including chemical consumption, toxicity assessment, reactor design, and limitation of catalysts, are discussed in this paper. In addition, this paper also discusses the presence of ions, generation of by-products, and industrial applications of AOPs. Special emphasis is given to recent studies and large-scale combination of AOPs for wastewater treatment. This review paper concludes that more studies are needed for the kinetics, reactor design, and modeling of hybrid AOPs and the production of their corresponding intermediate products and secondary pollutants. A better economic model should also be developed to predict the cost of AOPs, as the treatment cost varies with dyes and textile effluents.

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Characterization and coagulation–flocculation behavior of polymeric aluminum ferric sulfate (PAFS)

Investigations of coagulation–flocculation process by performance optimization, model prediction and fractal structure of flocs

Oxidation of acidic dye Eosin Y by the solar photo-Fenton processes

Since releasing saline wastewater into the environment without first treating it can seriously harm the ecosystem by contaminating soil, surface water, and groundwater, it has become one of the main problems in many nations. This paper highlights forward osmosis membrane and forward osmosis membrane bioreactor, electrodialysis, and electrodialysis metathesis techniques for saline water and wastewater treatment. Besides, the fouling issues of membranes and mitigation methods are discussed. Among them, the prospects and challenges faced by membrane technology include membrane pollution, the lack of pilot-scale research, and problems related to economic aspects. Additionally, the methods that have obvious effects on alleviating membrane pollution are presentment before the main membrane device, physical or chemical cleaning, and membrane modification.

Xinyi Xiang

Papers

Characterization and coagulation–flocculation behavior of polymeric aluminum ferric sulfate (PAFS)

Investigations of coagulation–flocculation process by performance optimization, model prediction and fractal structure of flocs

Oxidation of acidic dye Eosin Y by the solar photo-Fenton processes

Advanced Membrane Technologies for Saline Wastewater Treatment