title: Bacillus mojavensis strain 32A, a bioflocculant-producing bacterium isolated from an Egyptian salt production pond.
abstract: Bacillus mojavensis strain 32A that exhibited 96.11% flocculation efficiency for clay suspensions was selected from other 15 comparative strains. Under growth condition, strain 32A was able to produce 5.2g/L of purified biopolymer. Its constituent was mainly polysaccharide and protein with proportional of 98.4-1.6% respectively. FTIR spectrum was confirming its chemical analysis. This biopolymer attain very fast sedimentation rate. The cost-effective biopolymer and CaCl(2) dosages were 3mg/L and 5 ml/L respectively that posed 89.7% flocculation efficiency. These dosages were suitable only for clay concentrations ≤5g/L. The maximum flocculation efficiency of the biopolymer recorded at pH 1.0 of clay suspension. The too high (>75°C) or too low (<25°C) clay suspension temperature was unfavorable for the biopolymer flocculation performance. The biopolymer solution utilized high thermal stability over the temperature range of 5-60°C. Furthermore, its pH stability recorded at pH range of 5-9.
authors.affiliation: Advanced Technology and New Materials and Research Institute (ATNMRI), Fabrication Technology Department, City for Scientific Research and Technology Applications, Alexandria, Egypt.
authors.forename: M F
authors.initials: MF
authors.lastname: Elkady
authors.forename: Soha
authors.initials: S
authors.lastname: Farag
authors.forename: Sahar
authors.initials: S
authors.lastname: Zaki
authors.forename: Gadallah
authors.initials: G
authors.lastname: Abu-Elreesh
authors.forename: Desouky
authors.initials: D
authors.lastname: Abd-El-Haleem
mesh_terms: D001407:Bacillus / Q000378:metabolism*; D001704:Biopolymers / Q000378:metabolism*; D004534:Egypt; D005427:Flocculation; D061005:Ponds / Q000382:microbiology*; D012492:Salts; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001704:Biopolymers; D012492:Salts