Removing Disperse Red 60 and Reactive Blue 19 Dyes Removal by Using Alcea Rosea Root Mucilage As a Natural Coagulant

Overview

Journal AMB Express

Date 2019 Jul 24

PMID 31332554

Citations 1

Authors

Tahereh Zarei Mahmoudabadi

Parvaneh Talebi

Mahrokh Jalili

Affiliations

Soon will be listed here.

Abstract

In terms of health, dyes have carcinogenic, mutagenic and toxic properties and can have adverse effects on health and the environment. Therefore, sewage containing to dyes must be purified before being discharged into the environment. The current study aimed to investigate the effectiveness of Alcea rosea root extract in Disperse red 60 and Reactive blue 19 dyes removal from synthetic sewage. In this study, the effect of different indices including pH (5-11), Alcea rosea concentration (50-300 mg/L) and initial dye concentration (10-80 mg/L) was investigated. During the tests, the coagulant was stirred with rapid mixing at a speed of 250 rpm for 2 min. In the following, the speed (30-60 rpm) and the time (10-25 min) were used for slow mixing and after mixing the effect of settling time (10-60 min) and temperature (20-70) on removal efficiency of Disperse and Reactive dyes was investigated. The results showed that the maximum of removal efficiency of Disperse and Reactive dyes in optimum conditions including (pH = 11, coagulant concentration = 200 and 250 mg/L, dye concentration 40 and 20 mg/L, speed 60 rpm, during 15 min with settling time 60 min and temperature 60 °C obtained 86% and 68%, respectively. According to the result, the Alcea rosea coagulant has the best ability in removing dyes from aqueous solutions and sewage, especially Disperse dyes. Disperse dye is much eliminated in the coagulation process due to its lower solubility, higher suspending materials and less required solved chemical oxygen demand to the total chemical oxygen demand (SCOD/TCOD).

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