| Parameters(temperature, water content and so on) in the process of sludge biophysical co-drying were studied in self-made biophysical co-drying reactor. The sludge∶tree bark∶recycled sludge was set as 7∶3∶0.5, 9∶3∶0.5, 12∶3∶0.5 respectively. The results suggested that sludge temperature first increased then decreased along with drying time, water content decreased in the first 96 h, then had no obvious variability. While sludge∶tree bark∶recycled sludge was 9∶3∶0.5, the temperature of sludge spiraling, received to max 67℃ at 48 h under three different accessories mixture ratio, and was kept for 72 h above 55℃, then spiraling, the final water content of sludge decreased from 74.1% to 61.8%, received the optimal water content removing rate 43.5%. Accessories mixing ratio had important influence on the process of sludge biophysical co-drying, sludge with proper mixing ratio can modify the structure of sludge, improve sludge permeability, arouse and keep microorganic activity, which will enhance sludge temperature and strengthen water content removal rate. |
