Enhancing volatile fatty acids production from waste activated sludge by a novel cation-exchange resin assistant strategy

JOURNAL OF CLEANER PRODUCTION

卷:278

Article

Pang, Heliang^1,2  He, Junguo^1,2,3  Ma, Yingqun⁴  Pan, Xinlei^1,2  Zheng, Yanshi^1,2  Yu, Huarong³  Yan, Zhongsen⁵  Nan, Jun^1,2 

[1] Harbin Inst Technol, Sch Environm, Harbin 150090, Peoples R China

[2] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

[3] Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Peoples R China

[4] Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Adv Environm Biotechnol Ctr, 1 Cleantech Loop, Singapore 637141, Singapore

[5] Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Fujian, Peoples R China

关键词: Waste activated sludge;    Cation exchange resin;    Sludge hydrolysis;    Volatile fatty acids;    Chemical regeneration;   

DOI  :  10.1016/j.jclepro.2020.123236

来源: Elsevier

【 摘 要 】

This study developed a novel strategy for enhancing volatile fatty acids production from waste activated sludge by cation-exchange resin assistant anaerobic fermentation. The process condition was optimized by response surface methodology. Considerable sludge disintegration degree (40.9%) and volatile fatty acids yield (4619.6 mg COD/L) were achievable at the proposed process conditions, i.e. cation-exchange resin dosage = 2.05 and 1.78 g/g SS, fermentation time = 4.97 and 6.46 d, and stirring strength = 246.9 and 261.2 rpm, respectively. Grey relational analysis revealed that cation-exchange resin dosage, fermentation time, and stirring strength presented similarly significant effects on sludge disintegration. The reusability tests showed that NaCl solution had the best effect on cation-exchange resin regeneration, and the performance of regenerated resin was comparable with the original resin on volatile fatty acids production. Compared with conventional pretreatment methods, the proposed cation-exchange resin assistant strategy revealed obvious advantages of saved pretreatment agents, easy operation, none chemical residual in sludge and small footprint. Total volatile fatty acids recovery can reach 1.46 x 10(8) tons chemical oxygen demand annually in terms of China's context, which could offset one third of carbon gap in China's wastewater treatment plants. The proposed cation-exchange resin assistant strategy indeed sheds lights on the direction for WAS treatment in a close alignment with process viability and engineering feasibility. (C) 2020 Elsevier Ltd. All rights reserved.

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