摘要
      使用生石灰、FeCl3和阳离子聚丙烯酰胺（CPAM）作为污泥调理剂时，发现细胞裂解导致有机物严重损失，难降解的细胞内有机物和无细胞抗生素抗性基因（ARGs）显著释放，这对于污泥单独焚烧是不可行的，并增加了生态风险。因此，在中国，通过亚铁（Fe2+-Na2S2O8）活化的过硫酸盐氧化被应用于污泥改良剂的升级，比过滤阻力（SRF）和毛细管抽吸时间（CST）显著降低，去除率从40%提高到54%，这意味着亚铁（PAF）调节剂活化的过硫酸盐在污泥脱水中表现出良好的性能。PAF调理剂的使用仅降低了污泥的有机物含量和热值，同时降低了污泥中的Cl−含量，从而有效降低了对焚烧炉的腐蚀风险，与污泥分离焚烧具有良好的兼容性。根据亚铁的活化作用，硫酸根在污泥脱水过程中发挥着重要作用，因为发现紧密结合的胞外聚合物（TB-EPS）中的多糖和蛋白质含量显著降低。基于流式细胞术分析，使用PAF调节剂，轻微的细胞裂解表现出更好的滤液质量，49.3%的难降解细胞内有机物被去除，由于硫酸根的强氧化性，ermB、tetW和blaTEM分别降低了37.3%、54.5%和63.6%。难降解细胞内有机物和无细胞ARGs的大量减少将降低生态风险。当使用PAF调节剂时，总碳排放量显著降低至1771.1 kgCO2/tDS，这有利于污泥深度脱水调节剂的升级。
Abstract
Serious loss of organic substances and notable release of refractory intracellular organics and cell-free antibiotic resistance genes (ARGs) caused by cell lysis are found when quick lime, FeCl3, and cationic polyacrylamide (CPAM) were used as sludge conditioners, which is not feasible to sludge separate incineration and increases ecological risks. Therefore, persulfate oxidation through ferrous (Fe2+-Na2S2O8) activation was applied for the upgradation of sludge conditioner in China, the specific resistance to filtration (SRF) and capillary suction time (CST) significantly decreased and the removed water increased from 40% to 54%, implying that the persulfate activated by ferrous (PAF) conditioner presents good performance in sludge dewatering. Organic matter content and heating value of sludge merely decreased, and Cl− content in sludge simultaneously decreased with the use of the PAF conditioner, thereby effectively reducing the corrosion risk to the incinerator and showing good compatibility with sludge separate incineration. In accordance with ferrous activation, sulfate radical plays an important role in sludge dewatering process because remarkable decrease in polysaccharides and protein contents from tightly bound extracellular polymeric substances (TB-EPS) was discovered. Based on flow cytometry analysis, slight cell lysis presented better filtrate quality by the use of PAF conditioner, 49.3% of refractory intracellular organics was removed and the respective ermB, tetW and blaTEM decreased by factors of 37.3%, 54.5% and 63.6% due to the strong oxidizing property of sulfate radical. The intensive decrease in refractory intracellular organics and cell-free ARGs will reduce the ecological risks. The total carbon emission significantly decreases to 1771.1 kgCO2/tDS when PAF conditioner was employed, which is beneficial to the upgradation of sludge deep dewatering conditioners.

https://www.sciencedirect.com/science/article/abs/pii/S0013935122003516