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INTERNATIONAL JOURNAL OF PHARMACEUTICAL RESEARCH

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Published by : Advanced Scientific Research
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0975-2366
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IJPR 9[3] July - September 2017 Special Issue

July - September 9[3] 2017

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Removal of pollutants from pharmaceutical wastewater by adsorption and the regeneration of pollutants by various methods: A Review

Author: SHREYAS A SHENOY, SRINATH SHANBHAG, C R GIRISH
Abstract: Pharmaceutical wastewater contains various pollutants like biological oxygen demand, chemical oxygen demand, dissolved solids, suspended solids, organic compounds, chlorides, sulphides and heavy metals. These pollutants cause harmful effect on the aquatic streams and environment. Adsorption is one of the widely used unit operations for reduction of toxic compounds in an industry’s effluents. One-time utilization of adsorbents makes the process less economical and hence, there is a need for rejuvenation of adsorbents. Spent sorbents get saturated with adsorbate molecules, and hence can be regenerated upon removal of those molecules from the sorbent’s surface. There are several techniques of rejuvenating spent sorbents, differing with the medium used for regenerating the sorbent. Thermal regeneration uses hot gases for regeneration, whereas in chemical regeneration, suitable solvents are used to remove the molecules. Out of several techniques that exist for regeneration, thermal, chemical, ultrasound-assisted, biological, microwave-assisted methods, and regeneration using surfactants have been discussed in this review.
Keyword: Pharmaceutical wastewater, desorption, regeneration, pollutants, adsorption
DOI: https://doi.org/10.31838/ijpr/2021.13.02.445
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