The sludge(black sludge and protein sludge) and wet soybean dregs produced in soybean protein isolate production were dried by hydrothermal carbonization technology. The results showed that black sludge and protein sludge were dried well. Sludge and water was separated after hydrothermal carbonization treatment, moisture reduced from 85% to 30% after pressing, and the organic matter content was high. Hydrothermal carbonization technology met the requirement of harmless, recycling, reduction and stabilization, and had the advantages of low cost,and low requirement of environment, organic matter content and sand content in sludge, so it was a new sludge treatment process for enterprise. |