Abstract
Optical brighteners (OBs) are colorless fluorescent dyes, widely used in industry to improve whiteness in materials. Nearly 80% of all OBs in the market are derivatives of stilbene. They absorb the near-ultraviolet light and re-emit most of it in the blue range as visible fluorescence. OBs are commonly applied on textiles, detergents, paper and plastic products, among others. OBs have a low degradation ratio. In biological plants, they can only be partially removed by adsorption into the sludge and a tertiary treatment could be required to fully remove them. Part of them may persist and can be found in river and lake waters. The current work aims to evaluate the effect of the OBs in the bacterial activity of biological wastewater treatment plants. The influence of two commercial OBs (Goldblanc BHA and Leucophor PC) on respiration rate was monitored by means of a semi-continuous electrolytic respirometer, in order to obtain information related to the growth of the biomass and the degradation of the substrate. Their acute toxicity was also determined. It was concluded that the OB effect on bacteria population is variable depending on its chemical structure. Unlike the former, the Leucophor-PC brightener had an impact on the respirometric rate.
Highlights
White color in textile products is commonly associated with purity and cleanliness
The current work aims In to order evaluate the effect of the Optical brighteners (OBs) in the bacterial of biological the degradation of the substrate, respiration (RR) of Vibrio ficheri wasof monitored by wastewater treatment plants
Biodegradability of OBs was evaluated by the BOD5 /chemical oxygen demand (COD) ratio
Summary
White color in textile products is commonly associated with purity and cleanliness. For this reason, chemical bleaching processes are applied to improve the commercial value of textile goods. This study focused on OBs derived from stilbene, because these are nearly benzoxazole, coumarin, pyrazolines, etc. OBs. The majority are used of oncotton bleaching of in cotton fabrics which have washing. The bleaching residual effluents low fatness to washing OBsin can be partially biological treatment plants, OBs can be only partially removed by adsorption into the sludge and isomerized by sunlight, but part of them may persist and can be found in river and lake waters. The current work aims In to order evaluate the effect of the OBs in the bacterial of biological the degradation of the substrate, respiration (RR) of Vibrio ficheri wasof monitored by wastewater treatment plants. Respiration rate (RR) of Vibrio ficheri bacteria was monitored by means of a semi-continuous mode electrolytic respirometer
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