Degradation Characteristics of Aniline with Ozonation and Subsequent Treatment Analysis

Abstract

Owing to the toxicity and low biodegradability of aniline in water, its removal usually needs high cost processes such as adsorption and advanced oxidation. The degradation characteristics of aniline during ozonation were studied. The influence of operation parameters such as contact time, initial concentration, ozone dosage, temperature, and pH was also investigated. With ozone dosage of 22 mg/L, neutral pH, and room temperature, the ozonation removed aniline efficiently. After two hours’ ozonation, aniline removal reached 93.57%, and the corresponding COD removal was 31.03%, which indicated most of aniline was transformed into intermediates. At alkaline conditions, the aniline was more susceptible to being removed by ozonation owing to more hydroxyl radicals’ production. The results of GC-MS indicated many intermediates appeared during the process of ozonation such as butane diacid, oxalic acid, and formic acid. The intermediates produced during ozonation were more biodegradable than aniline; thus the ozonation of such organic compounds as aniline could be integrated with biological processes for further removal.

Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC

“…In this section, only the first intermediates (C 6 ) are included, in an attempt to determine the beginning of the first degradation routes. Many of these degradation products showed up in the solution within the first 5 min, through the change from a non-coloured solution to another with reddish, brown, and yellow colouring [6,62,63]. In Figure 7, three cases with the same mass of TiO 2 /GAC (3.3 g L −1 ) were selected, representative of the different experimental conditions studied.…”

“…The uncontrolled discharge of industrial effluents containing aniline is harmful to both humans and the environment. In humans, it has been well-documented to induce carcinogenic, teratogenic, and mutagenic effects [6]. Acute exposure to high amounts of aniline (>1 g) for a 75 kg person could lead to coma or even death [7].…”

“…Conventional treatment systems based on biological processes are not suitable for the treatment of wastewater contaminated with aniline, due to micro-organism deactivation. Hence, new treatment technologies are needed, in order to transform aniline into biodegradable substances of lower toxicity before conducting biological treatment [6,8].…”

Treatment of aniline contaminated water by a self‐designed dielectric barrier discharge reactor coupling with micro‐bubbles: optimization of the system and effects of water matrix

“…(b). For aniline and phenol, the azyl and OH group on the benzene ring was more susceptible to being attacked by O 3 and •OH generated by the DDBD/MB reactor than the chain structure of acetaldehyde and acetic acid, thus higher removal efficiencies were obtained in the DDBD/MB system. In summary, the DDBD/MB system is selective to organic compounds which are more reactive with O 3 and •OH.…”

Degradation of nitrobenzene by synchronistic oxidation and reduction in an internal circulation microelectrolysis reactor

“…be developed. Given the electrophilic nature of the nitro group, reduction processes have been developed to convert nitrobenzene into aniline, which can be completely oxidized with relative ease by a subsequent aerobic process [17,18].…”