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| Optimization and comparison of two improved methods of algae- bacteria immobilized |
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Abstract Two methods have been used to improve the performance of immobilized algal-bacterial beads: replacing the fixative and coating chitosan. Effect of improved ways on immobilization and removal efficiency has been discussed .The results show that the immobilized beads were improved on stability and mechanical property. After four weeks, the removal rate of COD, NH3-N, PO43--P were 75.8%, 42.5%, 47.5% with the former immobilized beads, respectively, the removal rate of the three pollution were 73.8%, 51.8%, 54.5% with the latter, respectively. It shows a lower pollutant removal efficiency on the former and little effect on the latter compared with that before improved. The impact of the concentration, pH and coated time of chitosan solution on the pollutant removal efficiency has been studied. The optimal concentration, pH, coated time were 1%, 5.5, 15min, respectively.
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Received: 19 August 2011
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