Mining, smelting, processing, and industrial production emissions of waste heavy metal pollution is serious, and the enrichment of heavy metals, it is difficult to be degraded in the natural environment. Conventional methods for removing metals may be ineffective extremely expensive. not eco-friendly.Based on wastes recycling and circular economy, this thesis studied the characteristics of industrial fermentation waste A.niger as adsorbent for sequestering Pb(II) from aqueous solution. .Optimum biosorption was observed to be 72% at pH 5.5,biosorbent dose 1.5 mg/L, initial Pb(II)concentration 250 mg/L.A.niger can be used as a new economic and eco-friendly environmental materials of metal adsorption.
Penthorum chinense Pursh is rich in gallic acid, which has antioxidant, anti-inflammatory, antifungal and antitumor activities. In order to optimize their extraction conditions, various extraction parameters were chosen to identify their effects on gallic acid extraction. With extraction amount of gallic acid as index, based on single factor analysis, influence of solid/liquid ratio, ethanol concentration, fetch time and extraction temperature on extraction technology were investigated by orthogonal test. The optimization conditions for gallic acid extraction were determined as follows: ethanol concentration 60%, extraction time 2.5 h, temperature 90˚C and solid/liquid ratio 1:30. The corresponding gallic acid content was 4.85%. This optimized extraction process was stable and feasible.
Biosorption of As3+ ions by industrial fermentation waste Aspergillus niger free dry mycelium was investigated in a batch system..The influences of solution pH, biosorbent dose, As3+concentration, and contact time on As3+ were studied.The results indicatd that absorption capacity was strongly affected by the solution pH, the biosobent dose and initial As3+concentration.Optimum biosorption was observed to be 75% at pH 5.0,biosorbent dose 20g/L, initial As3+concentration 800ug/L. Adsorption equilibrium was established in 100 min. Biosorption equilibrium data were best described by Langmuir isotherm model.
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