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| Effect of pre-heating on bio-drying of citric acid dewatered sludge in winter |
| ZHANG Chen1, LI Yang-yang1, DONG Li-ming1, WANG Jin-wei2, LIU Yan-feng1, YU Zhan-qiu1 |
1. Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China;
2. Weifang Ensign Industry Co., Ltd, Weifang 261000, China |
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Abstract The effects and mechanism of dewatered sludge bio-drying from citric acid production were studied by preheating sludge ranged from 15℃ to 30℃ in winter. Water content of preheating sludge to 20℃ decreased from initial 70% to the final 34.80% after 14d period of bio-drying. The highest temperature reached 57℃ and the period of high temperature remained 5.5d. Compared to the removal rates of bound water between 44.39% and 49.35% in other preheating groups, the group of preheating to 20℃ had much higher rate with 65.58%. It was indicated from the analysis of energy balance that the group of preheating to 25℃ had the maximum bio-energy while 82.62% of total energy was consumed on the water evaporation for the group of preheating to 20℃ with the highest energy utilization efficiency. Through the analysis of protein and polysaccharide in sludge extracellular polymer, the ratios of protein and polysaccharide in LB-EPS and TB-EPS had significant positive correlations with sludge bound water. And the contents of protein in Slime-EPS、LB-EPS、EP-EPS reduced significantly. It suggested that the decomposition of protein should be the main mechanism of heat generating and sludge dewatering for the citric acid dewatered sludge bio-drying.
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Received: 27 December 2018
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