Investigation of the properties and mechanism of activated sludge in acid-magnetic powder conditioning and vertical pressurized electro-dewatering (AMPED) process

被引:6
作者
Zhang, Yuxin [1 ]
Ling, Zichen [1 ]
Zhao, Miaomiao [1 ]
Sha, Li [2 ]
Li, Chen [1 ]
Lu, Xuebin [1 ,3 ,4 ,5 ]
机构
[1] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 30000, Peoples R China
[2] Beijing Construct Engn Grp Environm Remediat Co Lt, Natl Engn Lab Site Remediat Technol, Beijing 100015, Peoples R China
[3] Tibet Univ, Sch Ecol & Environm, Lhasa 850000, Peoples R China
[4] Tianjin Univ, Sch Environm Sci & Engn, Tianjin, Peoples R China
[5] Tibet Univ, Sch Ecol & Environm, Lhasa, Peoples R China
关键词
Electro-dewatering; Acid -magnetic powder conditioning; Extracellular polymeric substance; Sludge impedance; WASTE-WATER SLUDGE; FE(II)-ACTIVATED PERSULFATE OXIDATION; POLYMERIC SUBSTANCES EPS; DEWATERABILITY; NANOPARTICLES; FLOCCULATION; PRETREATMENT; COMBINATION; PERFORMANCE; MIGRATION;
D O I
10.1016/j.seppur.2023.124973
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Although sludge electro-dewatering is a promising sludge dewatering technology, it generally requires pre-treatment of sludge to achieve the desired dewatering effect. Herein, a technique was designed to use acid -magnetic powder conditioning as a pretreatment for sludge electro-dewatering, and the impacts of acid -magnetic powder conditioning and vertical pressurized electro-dewatering process were revealed. Pretreat-ment with CPAM conditioning, which is commonly used in sludge dewatering, and acid-magnetic powder conditioning conditioning were conducted on the sludge. The conditioned sludge was conducted electro-dewatering after precipitated. The results showed that under optimal conditions (pH = 5, 0.15 g magnetic powder/g DS), the dewatered sludge's MC was 48.5 %, a decline of 9.13 % compared to the CPAM conditioning. Acid-magnetic powder conditioning enhances the electro-dewatering effect mainly by destroying the substrate and reducing the sludge resistance. Pearson analysis revealed that conductivity showed an extremely strong positive correlation with SCOD (r = 0.812, p < 0.05) and extracellular polymeric substance (r = 0.811, p < 0.05) and a negative correlation with organic matter in the TB layer (r =-0.862, p < 0.05), and the sludge TB layer was significantly disrupted by acid-magnetic powder conditioning and vertical pressurized electro-dewatering. And there was a significant decrease in sludge impedance after conditioning. These findings demonstrate that acid -magnetic powder conditioning can greatly enhance the dewatering efficiency and is a potential pretreatment technology to assist in the sludge electro-dewatering process.
引用
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页数:10
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