Influence of thermal ventilation system on biodrying of sludge in food industry
LIU Yi-si, ZHOU Zi-an, SUN Xiao-ting, QI Guang-xia, YU Su-ping, DONG Li-ming
State Environmental Protection Key Laboratory of Food Chain Pollution Control, Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
Abstract：The combined heat treatment of dewatered sludge in food industry was carried out by preheating and thermal ventilation to simulate industrial waste heat. The biodrying effect and mechanism of dewatered sludge were studied under different thermal ventilation conditions (30,40,50℃). The results showed that the high temperature period of biodrying can be maintained for 62h(>45℃) at 40℃ of thermal ventilation based on preheating and the daily cumulative temperature TD was 15.77℃/d. The moisture content of the material decreased from 68.95% to 41.28% after 166 h of biodrying period. Three-dimensional fluorescence spectrum analysis showed that the organic matter in the initial material was mainly tyrosine. TC decreased from 243.6~243.8g/kg WM before biodrying to 182.9~191.7g/kg WM after biodrying, mainly decomposed in the form of CO2and finally stable in the form of humic acid. TN changed little in the whole process, and NH4+-N decreased from 0.867~0.877g/kg WM to 0.43~0.55g/kg WM. In the process of biodrying, NO3--N content was low, and the final content remained at 2.94~6.54mg/kg WM. The analysis results of energy balance and fuel characteristics of product showed that the energy utilization efficiency of water evaporation was the highest when the thermal ventilation reached 40℃ based on preheating, accounting for 85.34% of the total heat consumption. The obtained product had the best fuel value index (75.52).
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