Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
Wuxi Guolian Environmental Science and Technology Co.Ltd., Wuxi, 214000, China.
Environ Res. 2022 Aug;211:113024. doi: 10.1016/j.envres.2022.113024. Epub 2022 Mar 4.
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, FeCl, 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 (Fe-NaSO) 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 kgCO/tDS when PAF conditioner was employed, which is beneficial to the upgradation of sludge deep dewatering conditioners.
当使用生石灰、FeCl 和阳离子聚丙烯酰胺 (CPAM) 作为污泥调理剂时，会导致细胞裂解，严重损失有机物质，并显著释放出难处理的细胞内有机物和无细胞抗生素抗性基因 (ARGs)，不利于污泥分离焚烧，增加了生态风险。因此，在中国应用过硫酸盐氧化通过亚铁 (Fe-NaSO) 激活来升级污泥调理剂，比阻滤 (SRF) 和毛细吸水时间 (CST) 显著降低，去除水从 40%增加到 54%，这表明亚铁激活过硫酸盐 (PAF) 调理剂在污泥脱水方面具有良好的性能。污泥中的有机物含量和热值仅略有下降，同时污泥中的 Cl 含量也随之下降，因此有效地降低了对焚烧炉的腐蚀风险，与污泥单独焚烧具有良好的兼容性。根据亚铁的激活，硫酸根自由基在污泥脱水过程中发挥了重要作用，因为从紧密结合的胞外聚合物物质 (TB-EPS) 中发现了显著减少的多糖和蛋白质含量。基于流式细胞术分析，使用 PAF 调理剂时，轻微的细胞裂解可产生更好的滤液质量，49.3%的难处理细胞内有机物被去除，ermB、tetW 和 blaTEM 分别减少了 37.3%、54.5%和 63.6%，这是由于硫酸根自由基的强氧化性质。难处理的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 调理剂时，总碳排放量显著减少到 1771.1kgCO/tDS，有利于污泥深度脱水调理剂的升级。
