In the original scientific paper, a Plackett-Burman two-level partial factorial design was adopted to determine the optimum UV/H2O2 process conditions for maximizing the treatment efficiency of dye-rich textile effluents. After determining seven variables, i.e. type and concentration of dye, concentration of NaCl, concentration of urea, the amount of NaOH, intensity of UV irradiation, the amount of H2O2, and treatment time, laboratory-scale experiments were conducted using two synthetically-prepared wastewaters solutions that were polluted with two structurally different reactive dyes and selected chemicals. The obtained results showed that the treatment time and dye concentration had a major impact on the reduction of both reactive dyes. At the same time, the amount of urea and the intensity of UV radiation had a notable influence on the organic pollutant reduction.
COBISS.SI-ID: 16030486
The main contribution of this paper was to select and investigate a few commercially available textiles to study their filtration/adsorption potential for salt and total organic carbon (TOC) reduction during wastewater treatment. With the intention of examining the adsorption ability of the selected textiles (two nonwoven and two woven textiles), kinetic experiments were carried out in shake-flasks using three commonly-used salts. Afterwards, small-scale column experiments were conducted in a continuous-flow operation to assess the TOC and salt reduction. It was found that both nonwoven textiles with the more complex structures and a higher total void area were more suitable for the removal of salt and TOC in comparison to the efficiency of a column packed with sand/woven fabrics, regarding the type and concentration of salt as well as the contact time.
COBISS.SI-ID: 16029974
The main contribution of the presented research is to examine the potential of natural zeolite for colour and TOC reduction when packed in a fixed-bed system, considering various parameters such as wastewater characteristics and system’ operational parameters. Particle size, porosity and surface texture of bedding material also played an important role in dye biodegradation because of solid adsorption capacity, ion exchange, and even microorganisms growth abilities. Generally, the laboratory trials and packed material’ analyses demonstrate that the system reduce the colour by up to 80% and TOC by up to 75% after an acclimatization period of 11-14 days.
COBISS.SI-ID: 15483670
Original scientific article examines the potential of fixed-bed treatment system for textile wastewater decolorization, regarding chemical constitution of dyestuffs, loading rate (dye loading rates between 19 and 43 mg/m3d and organic (TOC) loading rates between 73 and 168 mg/m3d) and hydraulic retention time (9-20 hours). The obtained results indicated that different retention times, which depend on velocity flow, have a superior influence on treatment efficiency. The longer the time, the greater the effects of wastewater treatment and the pollution parameters are lower.
COBISS.SI-ID: 15257622