Enhancing the dewaterability of waste activated sludge by the combined ascorbic acid and zero-valent iron/persulfate system

被引：17
作者：
Yuan, Longhu [1 ]
Liu, Huaixiang [1 ]
Lu, Yongjun [1 ]
Lu, Yan [1 ]
Wang, Dongbo [2 ,3 ]
机构：
[1] Nanjing Hydraul Res Inst, State Key Lab Hydrol Water Resources & Hydraul Eng, Nanjing 210029, Peoples R China
[2] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China
[3] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China
来源：
CHEMOSPHERE | 2022年 / 303卷
基金：
中国国家自然科学基金;
关键词：
Sludge dewaterability; Zero valent iron; Persulfates; Ascorbic acid; Extracellular polymeric substances; EXTRACELLULAR POLYMERIC SUBSTANCES; SEWAGE-SLUDGE; OXIDATION PROCESS; BOUND WATER; IRON; DEGRADATION; PRETREATMENT; BEHAVIORS; FE;
D O I：
10.1016/j.chemosphere.2022.135104
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, a reducing/chelating agent, ascorbic acid (H(2)A) was introduced to the traditional zero-valent iron (Fe-0)/persulfate (PS) process for waste activated sludge dewatering. The experimental data indicated that H(2)A-Fe-0/PS process significantly enhanced the dewatering performance of sludge and enhanced the oxidation efficiency of Fe-0-PS treatment. Under optimal conditions, the capillary suction time ratio before and after treatment (CST0/CST) of H(2)A-Fe-0/PS treated sludge increased by 118% and 31.3% compared with untreated sludge and Fe-0-PS treated sludge, respectively. The mechanism investigations revealed that the H(2)A-Fe-0/PS induced excellent enhancement for sludge dewaterability could be credited to the reduction and chelating capacity of ascorbic acid. Free radicals including SO4 center dot-, O-2(center dot-) and center dot OH produced in the H(2)A-Fe-0/PS process destroyed proteinaceous components and humic substances in sludge extracellular polymeric substances (EPS), thus reducing the negative charge and water holding capacity of sludge, improving the sludge rheological properties. As a result, the dewatering performance of sludge has been significantly improved.
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页数：11
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