当前位置: X-MOL 学术Sci. Total Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Insights into the enhancement of waste activated sludge dewaterability using sodium dichloroisocyanurate and dodecyl dimethyl ammonium chloride: Performance, mechanism, and implication
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-03-09 , DOI: 10.1016/j.scitotenv.2021.146302
Yanting Dong , Minxue Gu , Haiping Yuan , Nanwen Zhu

Sludge dewatering is essential for reduction of sludge volume to cut the cost of transportation and disposal. Combined application of sodium dichloroisocyanurate (DCCNa) and dodecyl dimethyl ammonium chloride (DDAC) was attempted to promote sludge dewatering performance and physicochemical properties for the first time in this work. The results showed that capillary suction time (CST) and moisture content of dewatered sludge cake (Mc) decreased to 15.9 s and 61.54 % compared to 144.5 s and 90.39 % of raw sludge, respectively, with the addition of optimal dosage of 150 mg DCCNa/g DS and 125 mg DDAC/g DS. The conditioning mechanism of combined treatment was elucidated by investigating the variations of extracellular polymeric substances (EPS) composition, flocs morphological structure, rheological behavior, moisture distribution and Fourier transform infrared (FTIR) of sludge. It could be found that sludge floc cells were decomposed and bound water was released after DCCNa treatment. The bound water content was further decreased with the presence of DDAC. In addition, DDAC not only increased the zeta potential and flowability of sludge, but also reduced the surface tension and interact with oxygen-containing functional groups in sludge. As a result, the sludge dewaterability was significantly improved. Moreover, the calorific value analysis of dewatered sludge cake indicated that combined conditioning of DCCNa and DDAC presented the advantage of incineration disposal.



中文翻译:

使用二氯异氰尿酸钠和十二烷基二甲基氯化铵提高废物活性污泥脱水能力的见解:性能,机理和意义

污泥脱水对于减少污泥量,降低运输和处置成本至关重要。这项工作中首次尝试将二氯异氰尿酸钠(DCCNa)和十二烷基二甲基氯化铵(DDAC)结合使用以提高污泥的脱水性能和理化特性。结果表明,脱水污泥饼的毛细抽吸时间(CST)和含水量(Mc)分别从原污泥的144.5 s和90.39%降低到15.9 s和61.54%,并添加了最佳剂量150 mg DCCNa / g DS和125 mg DDAC / g DS。通过研究细胞外聚合物(EPS)的组成,絮凝物的形态结构,流变行为,污泥的水分分布和傅里叶变换红外光谱(FTIR)。可以发现,DCCNa处理后,污泥絮状细胞被分解并释放出结合水。在存在DDAC的情况下,结合水含量进一步降低。另外,DDAC不仅增加了污泥的ζ电位和流动性,而且降低了表面张力并与污泥中的含氧官能团相互作用。结果,污泥的脱水性得到显着改善。此外,脱水污泥饼的热值分析表明,DCCNa和DDAC的组合处理具有焚烧处理的优势。在存在DDAC的情况下,结合水含量进一步降低。另外,DDAC不仅增加了污泥的ζ电位和流动性,而且降低了表面张力并与污泥中的含氧官能团相互作用。结果,污泥的脱水性得到显着改善。此外,脱水污泥饼的热值分析表明,DCCNa和DDAC的组合处理具有焚烧处理的优势。在存在DDAC的情况下,结合水含量进一步降低。另外,DDAC不仅增加了污泥的ζ电位和流动性,而且降低了表面张力并与污泥中的含氧官能团相互作用。结果,污泥的脱水性得到显着改善。此外,脱水污泥饼的热值分析表明,DCCNa和DDAC的组合处理具有焚烧处理的优势。

更新日期:2021-03-09
down
wechat
bug