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| Sensitizer characteristics and its enhancement performance to sludge decomposition associated with microwave |
| WANG Zi-wen1, ZHANG Zheng-hao1, WANG Yan1, YANG Xu-jun2, YANG Han-wen2, LI Chong2, WANG Rui2, CHEN An-yi2, WANG Shuo1,3, LI Ji1,3 |
1. School of Environment and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China;
2. Guolian Environment and Energy Group, Wuxi 214122, China;
3. Collaborative Innovation Center of Water Treatment Technology and Material of Jiangsu Colleges, Suzhou 215009, China |
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Abstract Sludge activated carbon (SAC), TiO2/SAC and Fe3O4/SAC were used as the sensitizers to enhance the decomposition of excess sludge associated with microwave. Based on the analysis of chemical oxygen demand (COD), DNA, nitrogen, phosphorus and organic matters from the filtrate, the optimal conditions were investigated. After loading TiO2 and Fe3O4 on SAC, the dielectric loss and hysteresis loss of electromagnetic wave were enhanced. When the dosage of TiO2/SAC was 0.25g/gSS, the filtrate COD concentration was 1900mg/L, which increased by factors of 4.52 and 1.86 to the excess sludge and sludge treated by microwave, however, the addition of Fe3O4 is more conducive to the decomposition of excess sludge, the filtrate COD content was up to 2540mg/L, which was 6.05 times and 2.45 times higher than that of excess sludge and sludge treated by microwave. In addition, the filtrate total phosphorus (TP), total nitrogen (TN), protein and polysaccharides concentrations increased by factors of 7.7, 16, 7.49 and 71.69, indicating that a large amount of intracellular and extracellular polymeric substances released to filtrate and further greatly increased the soluble content of organic matters. The pretreatment method of microwave + sensitizer is beneficial to resource utilization and recovery of nitrogen, phosphorus and organic matters in excess sludge.
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Received: 05 September 2019
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