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Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review
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Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review
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Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review
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Journal Article
Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review
2018
Overview
Microorganisms such as bacteria, fungi, and microalgae have been used to produce bioflocculants with various structures. These polymers are active substances that are biodegradable, environmentally harmless, and have flocculation characteristics. Most of the developed microbial bioflocculants displayed significant flocculating activity (FA > 70–90%) depending on the strain used and on the operating parameters. These biopolymers have been investigated and successfully used for wastewater depollution in the laboratory. In various cases, selected efficient microbial flocculants could reduce significantly suspended solids (SS), turbidity, chemical oxygen demand (COD), total nitrogen (Nt), dye, and heavy metals, with removal percentages exceeding 90% depending on the bioflocculating materials and on the wastewater characteristics. Moreover, bioflocculants showed acceptable results for sludge conditioning (accepted levels of dry solids, specific resistance to filtration, moisture, etc.) compared to chemicals. This paper explores various bioflocculants produced by numerous microbial strains. Their production procedures and flocculating performance will be included. Furthermore, their efficiency in the depollution of wastewater will be discussed.
