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Preparation and characteristics of bioflocculant from excess sludge | IEEE Conference Publication | IEEE Xplore

Preparation and characteristics of bioflocculant from excess sludge


Abstract:

In this study, the feasibility of bioflocculant prepared from excess sludge to reduce its production costs and carve out a new way to attain bioflocculant was investigate...Show More

Abstract:

In this study, the feasibility of bioflocculant prepared from excess sludge to reduce its production costs and carve out a new way to attain bioflocculant was investigated. Three reagents were used to disintegrate excess sludge including alkali, acid and oxyful. Results showed that the performance of alkali treatment was the best. The flocculating rate of the prepared bioflocculant by the alkali and acid treatment for kaolin clay (5g/L) was 92.6%, 88.5% respectively. The prepared influence factors such as alkali dosage and treatment time were researched. The optimal conditions were 4 g alkali dosage and 30min treatment time for 100mL sludge suspension. Under these conditions, the flocculating rate of kaolin clay was 92.6%. The major component of purified bioflocculant was found to be polysaccharide. Infrared spectrum analysis showed the presence of hydroxyl and acylamino groups in the bioflocculant.
Date of Conference: 20-22 May 2011
Date Added to IEEE Xplore: 27 June 2011
ISBN Information:
Conference Location: Shanghai

I. Introduction

Bioflocculant is a kind of macromolecular flocculant secreted by microorganisms which is easily degradable. Owing to the nontoxic, harmless characteristic of bioflocculant and without secondary pollution, they have a great potential for use in wastewater treatment. At the present time most of research focused on screening for microorganisms, culture conditions, mechanism of flocculation, chemical structure, and so on [1]–[3]. However, high production costs associated with relatively expensive substrates, such as glucose, fructose and glutamate limit their practical application [4]. Seeking for low-cost substrates to reduce the production cost was also investigated. The excess biological sludge was generated from the biological treatment process of wastewater. The sludge management is the major issue of wastewater treatment plant, as it costs 60% of the total plant capital cost and the laws for sludge disposal are becoming increasingly stringent. Excess biological sludge contains various fractions of water associated with sludge solids, most of which are made up of microorganisms. The main constitutes of the microorganisms were macromolecules compounds such as polysaccharide, protein, cellulose and so on. These macromolecules compounds have flocculating activity. Tenney and Stumm [5] had shown that macromolecules could be viewed as naturally produced flocculants. Thus excess biological sludge is believed as a source of bioflocculants and could be recycled to prepare bioflocculant.

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References

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