Preparation of Gypsum Retarder from Hydrolyzing Waste Penicillin Mycelium by Microwave Heating Method

摘要

Waste penicillin mycelium (WPM) is a solid waste from the production process of penicillin in pharmaceutical industry, which is difficult to dispose because of environmental and safety problems. We treated WPM by microwave hydrolysis in alkali condition and used for gypsum retarder. Four factors were investigated: alkali concentration, solid-liquid ratio, treatment time and temperature. The optimal results for the hydrolysis process were obtained: alkali concentration 0.04 mol/L, solid-liquid ratio 1:3, treatment time 12 min, and at 85 °C. The change rule of protein content is not consistent with that of setting time from the experimental data, which suggests that the components as amino acid, citric acid and lactic acid in retarder also have the retarding effect on gypsum.