Removal of organic compounds from wastewater originating from the production of printed circuit boards by UV-Fenton method

Abstract

Abstract:The possibility of removing organic compounds from wastewater originating from the photochemical production of printed circuit boards by use of waste acidifi cation and disposal of precipitated photopolymer in the fi rst stage and the UV-Fenton method in a second stage has been presented. To optimize the process of advanced oxidation, the RSM (Response Surface Methodology) for three independent factors was applied, i.e. pH, the concentration of Fe(II) and H 2 O 2 concentration. The use of optimized values of individual parameters in the process of wastewater treatment caused a decrease in the concentration of the organic compounds denoted as COD by approx. 87% in the fi rst stage and approx. 98% after application of both processes. Precipitation and the decomposition of organic compounds was associated with a decrease of wastewater COD to below 100 mg O 2 /L whereas the initial value was 5550 mg O 2 /L. Decomposition of organic compounds and verifi cation of the developed model of photopolymers removal was also carried out with use of alternative H 2 O 2 sources i.e. CaO 2 , MgO 2 , and Na 2 CO 3 ·1,5H 2 O 2 .

Treatment of gray wastewater and heavy metal removal from aqueous medium using hydrogels based on novel crosslinkers

“…hydrogel films, hydrogel nanocomposites, and hydrogel beads, based on their structure and properties. The low cost of preparation and high water absorption capacity of hydrogel make it an excellent adsorbent for the removal of heavy metals and for wastewater treatment 9,10 . Polyacrylic acid‐based hydrogel is a typical polymeric gel, which have ionic functional groups (COO − ) and these ionic functional groups take part in various processes during the removal of heavy metal ion viz.…”

Taguchi Method and Response Surface Methodology in the Treatment of Highly Contaminated Tannery Wastewater Using Commercial Potassium Ferrate

“…An alternative method used to optimize wastewater treatment is the response surface methodology (RSM) based on central composite design (CCD), which requires a larger number of experiments than the TM, but offers more advanced statistical analysis of the results. The RSM has been applied to optimize the coagulation of paper recycling wastewater using Ocimum basilicum [45], remove organic compounds from printed circuit board wastewater using the UV-Fenton method [46], optimize the electrocoagulation of instant coffee production wastewater [47], and for many other applications. The novelty of this study is the use of two methods of experiment planning and analysis to optimize the tannery wastewater treatment process using potassium ferrate.…”

The Use of Sodium Percarbonate in the Fenton Reaction for the PAHs Oxidation

“…However, sodium percarbonate was used in the photo-Fenton reaction for the treatment of industrial wastewater with a COD value exceeding 5,000 mgO2/L. The effectiveness of removing organic compounds expressed by COD index reached 73% [19]. Taking into consideration differences in composition of the tested wastewater with data described in the literature and the differences of process conditions, it is difficult to compare the results obtained with the data available in the literature.…”