食用菌菌糠对重金属离子的吸附性OACSTPCD

By using the technology of low-cost biosorbent for remove Pb2+ and Zn2+ in wastewater, the adsorption of spent mushroom substrates was studied. The effect of different parameters such as pH, initial concentration of heavy metals, adsorbent dosage, adsorption time, and temperature to the adsorption ability were investigated.The results show that ( 1 ) The adsorption efficiency of Pb2+ could reach 92. 79％ at the following optimum conditions: adsorbent dosage 16g/L, pH 5, initial concentration of heavy metals 20mg/L, adsorption temperature 25℃ for 3h; (2) The adsorption efficiency of Zn2+ could reach 88.96％ at the following optimum conditions: adsorbent dosage 12g/L, pH 6, initial concentration of heavy metals 20mg/L, adsorption temperature 25℃ for 3h. Ater treatment, the concentration of Pb2+ and Zn2+ were 1. 442mg/L and 2. 208mg/L, which close to the integrated wastewater discharge standard (GB8978-1996).