Removal of Auto-growth Inhibitors of Spirulina platensis and Model Analysis
螺旋藻自身生长抑制物的去除及模型分析

A long-term used culture medium of Spirulina platensis was treated with different adsorbents,and they were screened in removal of the contained inhibitors via comparison of specific growth rate of Spiruina platensis in different adsorption-treated culture media.The concentrations of polysaccharide,organic acid and protein in culture medium before and after adsorption were compared,and the one with the largest concentration disparity was extracted to test its inhibition effect on Spirulina platensis growth.In addition,model analysis was carried out on the adsorption process.The results showed that the auto-growth inhibitor of Spirulina platensis was extracellular polysaccharide,and the adsorption treated culture medium by macro-porous adsorption resin S-8 could reduce extracellular polysaccharide content by 62% and simultaneously increased the specific growth rate by 39.4%,compared with the non-treatment medium.For the adsorption process of polysaccharide by S-8,30 min was sufficient for equilibrium,pseudo-second-order and Boyd film diffusion model fitted well with the kinetic data,with linear correlation coefficients of 0.9991 and 0.9374,respectively.