Biological degradation of catechol in wastewater using the sequencing continuous-inflow reactor (SCR)

Abstract

Catechol is used in many industries. It can be removed from wastewater by various methods but biological processes are the most superior and commonly used technology. The SCR is a modified form of SBR used to degrade catechol. The objective of this study was to investigate the performance of SCR for biodegradation and mineralization of catechol under various inlet concentrations (630–1500 mg/L) and hydraulic retention times (HRT) (18–9 h). This study used a bench scale SCR setup to test catechol degradation. The acclimation time of biomass for catechol at degradation at 630 mg/L was 41 d. The SCR operating cycle time was 6 h and the consecutive times taken for aerating, settling and decanting were 4, 1.5 and 0.5 h, respectively. This study investigated the effects of inlet catechol concentration (630–1560 mg/L) and HRT (18–9 h). The average catechol removal efficiencies in steady-state conditions of 630, 930, 12954 and 1559 mg/L of catechol were 98.5%, 98.5%, 98.2% and 96.9% in terms catechol and 97.8%, 97.7%, 96.4% and 94.3% for COD, respectively. SCR with acclimated biomasses could effectively remove the catechol and the corresponding COD from wastewater with concentrations of up to 1560, at the loading rate of 5.38 kg COD/m3.d and at a HRT of up to 13 h. The HRT was determined as an important variable affecting catechol removal from wastewater. Reducing the HRT to below 13 h led to reduced removal of catechol and COD.

Optical biosensor for catechol determination based on laccase‐immobilized anionic polyamide 6 microparticles

“…[1,2] It has been classified as possibly carcinogenic to humans by the International Agency for Research on Cancer (IARC) [3] and is fatally toxic to fish at concentrations of 5-25 mg/L. [4] Due to its aromatic structure, catechol is very stable and persistent under environmental conditions. [5] Therefore, its removal from wastewater is crucial and its monitoring in industrial effluents is mandatory.…”

“…[5] Therefore, its removal from wastewater is crucial and its monitoring in industrial effluents is mandatory. [4] Conventional analytical methods for catechol determination include high-performance liquid chromatography, [6] gas chromatography/mass spectrometry, [7] electroanalysis, [8] spectrophotometry, [9] and fluorescence. [10] These techniques provide accurate and precise results but are related with expensive and complex instrumentation.…”

Changes in the forest ecosystems in areas impacted by aridization in south-western Romania

“…In addition to the socio-economic factors, the natural factors, too, impacted on the quality and productivity of forest vegetation in the past few decades. Nowadays, the study area is midway through a full-scale aridization, and specialized studies at the regional level confirmed this phenomenon by means of climate change [ 31 - 35 ], landscape dynamics [ 29 ], by highlighting the dynamic of forest areas with the direct effects of the activation of the extant sand-dunes in the region [ 30 , 36 , 37 ], among others. The rise of the temperature and the drop in the average annual precipitations of the past three decades have brought about, in many situations, the drying up of the vegetal layer and of the very forest species [ 29 , 35 ].…”

Amperometric Tyrosinase Biosensor Based on Carbon Black Paste Electrode for Sensitive Detection of Catechol in Environmental Samples

“…Catechol is classified as an environmental pollutant due to the toxicity to humans (lethal in the range of 50–500 g kg −1 ), animals, plants and aquatic organisms. Continuous contact with catechol can cause depression of the central nervous system and a lengthy rise in blood pressure in living beings [2]. Therefore, the development of sensitive devices for low‐level detection of catechol is very important for monitoring this compound in different matrices.…”