A Novel Bioflocculant from Raoultella planticola Enhances Removal of Copper Ions from Water

Fancheng Zeng,Caiyun Sun,Libo Chen,Liang Xu,Hong Liu

doi:10.1155/2020/2581205

Fancheng Zeng, Caiyun Sun + Show 3 more

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https://doi.org/10.1155/2020/2581205

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Abstract

Copper is one of the most toxic heavy metals. In this work, a sampling survey of copper ions in the water of Songhua River flowing through the chemical and living areas of Jilin City was studied. A new bioflocculant from Raoultella planticola was obtained. The investigation of Songhua River flowing through Jilin City shows that the copper concentration is between 0.07 ppb and 0.16 ppb. The bioflocculant supporting graphite oxide (GO) as a bioflocculant inducer used in this study has been utilized in treatment of copper ions in water. GO and bioflocculant infrared radiation (IR) spectrum and zeta potential were studied. Flocculational conditions of copper ion (0.2 ppm) were modeled and optimized using RSM (response surface methodology). Our data showed that flocculation efficiency was over 80%. Significant influencing factors and variables were pH, flocculation time, bioflocculant dosage, and GO inducer which had major impact effects on flocculation efficiency. The highest flocculation efficiency which is 86.01% was achieved at pH=5, at 1.62 h and 13.11 mg bioflocculant with 13.11 mg GO as an inducer. However, temperature (A) and GO inducer were significant impact factors on the flocculation efficiency.

Highlights

Copper is widely used in metallurgy, machine manufacturing, electroplating, chemistry, and other industries
The bioflocculant supporting graphite oxide as a bioflocculant inducer used in this study has been studied in the treatment of copper ions in surface water
The results showed that Raoultella planticola produced flocculant which had never been reported before

Summary

Introduction

Copper is widely used in metallurgy, machine manufacturing, electroplating, chemistry, and other industries. The total content of copper in a normal human body is about 100-150 mg [1]. The toxicity of copper to lower organisms and crops is relatively high. When the concentration of copper reaches 0.1-0.2 mg/L [3], fish will die. When it coexists with zinc, the toxicity will increase, and the toxicity to shellfish water will be greater [4]. The concentration of copper in water for aquaculture is required to be below 0.01 mg/L [5]. When the copper content in irrigation water is high, it accumulates in soil and crops, which can make crops wither [6]

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