Oxidation Of Textile Wastewater Research Articles

Influence of Operating Conditions on the Persulfate Oxidation of Textile Waste Water at Ambient Temperature

At the ambient temperatures, the influence of operating conditions on persulfate (S2O8) oxidation of real textile wastewater was investigated for the removal of color, suspended solids (SS) and chemical oxygen demand (COD). The effects of oxidant dosage, initial solution pH and contact time were studied in a series of batch experiments using persulfate (PS) oxidant as sodium persulfate. Oxidant dose was defined by an oxidant/contaminant (PS/COD) molar ratio, varied from 1/1-10/1. Although parameter removals increased with the oxidant dose, especially for color and SS, a PS/COD molar ratio of 4/1 (6720mg/L) was adopted in a bid to use fewer chemicals. The pH was varied from 2-11, with pH of between 2 and 3 being the optimum. At 360minutes contact time, the removals of color, SS and COD were 84%; 71% and 32% respectively. Although relatively effective, especially for color removal, results show that the reactions might have been inhibited at ambient temperatures as shown by the particularly low removal of COD.

Oxidation of textile wastewater using cylinder Ti/β-PbO2 electrode in electrocatalytic tube reactor

Abstract Electrocatalytic tube reactor using Ti/PbO2 cylinder electrode had been fabricated to degrade textile wastewater. The electrode was synthesized by anodic electrodeposition method. It was utilized as an anode and paired with stainless steel cathode located in the center of electrocatalytic tube and connected to a driving engine that enabled it to be used as mixer. Reactor was operated by flowing textile wastewater and charging it at 5.6 DC V. Optimum operation condition was investigated on specified variables, i.e., HRT (2 and 4 h), pH (6 and 9), and concentration of salt (3000 and 4000 mg/L). Physico-chemical characterization of synthesized Ti/PbO2 electrode showed that PbO2 was deposited with tetragonal crystal structure and ±200 nm of particle size. Reactor was able to degrade wastewater and decrease BOD, COD, TSS, NH3, phenol, and H2S to 96%, 59%, 91%, 74%, 70% and 82%, respectively, on an operation condition: 19 A, 5.6 V, pH 6, 4000 mg/L salt concentration and HRT 4 h.