Abstract
The flocculation performance of bioflocculant produced by Aspergillus flavus S44-1 grown on chicken viscera hydrolysate was investigated. The investigations were carried out using jar testing and kaolin clay suspension as model wastewater. The bioflocculant yielded a minimum of 83.1% efficiency in flocculating 2-12 g L-1 kaolin clay suspension over a wide temperature range (4-80 °C) and functioned maximally at neutral pH. The bioflocculant significantly flocculated different suspended particles such as activated carbon (92%), soil solid (94.8%), and algae (69.4%) at varying concentrations. Bridging mediated by cation is suggested as the main mechanism of flocculation by the present bioflocculant.
Highlights
The discharge of untreated industrial, agricultural, and domestic wastes constitutes a major source of water pollution
The present study is an evaluation of flocculation performance of a bioflocculant produced by Aspergillus flavus S44-1 grown on chicken viscera hydrolysate as a sole source of nutrient
The results indicated that 5–6 ml of crude bioflocculant produced about 94% flocculation efficiency in 4 g L-1 soil solution
Summary
The discharge of untreated industrial, agricultural, and domestic wastes constitutes a major source of water pollution. Synthetic chemical flocculants have extensively been used for removal of suspended particles in water due to their efficiency and cost effectiveness; these flocculants are associated with secondary pollutant accumulation that may be toxic to human health [1]. Inadequate knowledge on flocculating conditions of any newly synthesised bioflocculant could result in poor efficiency. The economics of bioflocculant application is coupled with the use of low-cost substrate for microbial fermentation and identification of flocculating conditions of any newly synthesised bioflocculant [3]. The use of industrial/agricultural waste as a nutrient source for microbial fermentation has a concurrent advantage of combating environmental pollution by such wastes and reducing the cost of bioflocculant production and application. The present study is an evaluation of flocculation performance of a bioflocculant produced by Aspergillus flavus S44-1 grown on chicken viscera hydrolysate as a sole source of nutrient
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