Bi Wei-Wei, Ruan Shu-Yu, Chen Wu-Ao-Xiao, Liang Fang-Yi, Chen Zhi-Wen, Xie Song-Ru, Tang Jing, Deng Jing
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
MMC Huatian Engineering&Technology Corporation, Nanjing 210019, China.
Huan Jing Ke Xue. 2020 Dec 8;41(12):5544-5551. doi: 10.13227/j.hjkx.202004180.
Ferrous iron-activated calcium peroxide (Fe/CaO) was innovatively put forward to improve the dewaterability of waste-activated sludge. The effects of initial pH, Fe, and CaOdosages on sludge dewatering performance were investigated and its internal mechanism for achieving deep sludge dewatering was thoroughly explored. The results indicated that the best dewatering performance was obtained by dosing 3.31 mmol·g Fe and 3.68 mmol·g CaO under neutral pH, in which specific resistance to filtration (SRF) and water content () reduced from 20.99×10 m·kg and 86.61% to 3.91×10 m·kg and 76.15%, respectively. Fe/CaO oxidation caused sludge microbial cell lysis, release of intracellular organic matter, and degradation of extracellular polymeric substances (EPS). Meanwhile, the generated Fe facilitated re-flocculation of sludge particles into rigid and porous structure flocs, which was beneficial to the release of EPS-bound water to achieve deep sludge dewatering. From the perspective of technology and economy, the Fe/CaO process is economical and practical, and has a promising application prospect in improving the dewatering performance of waste-activated sludge.
创新性地提出了亚铁活化过氧化钙（Fe/CaO）以提高废弃活性污泥的脱水性能。研究了初始pH值、铁和氧化钙投加量对污泥脱水性能的影响，并深入探讨了其实现深度污泥脱水的内在机制。结果表明，在中性pH值条件下投加3.31 mmol·g铁和3.68 mmol·g氧化钙可获得最佳脱水性能，其中过滤比阻（SRF）和含水率分别从20.99×10 m·kg和86.61%降至3.91×10 m·kg和76.15%。Fe/CaO氧化导致污泥微生物细胞裂解、细胞内有机物释放以及胞外聚合物（EPS）降解。同时，生成的铁促进污泥颗粒重新絮凝成刚性且多孔结构的絮体，这有利于释放EPS结合水以实现深度污泥脱水。从技术和经济角度来看，Fe/CaO工艺经济实用，在提高废弃活性污泥脱水性能方面具有广阔的应用前景。
