Evaluation of reusing alum sludge for the coagulation of industrial wastewater
containing mixed anionic surfactants |
| |
Authors: | Siriprapha Jangkorn Sinchai Kuhakaew Suwapee Theantanoo Harit Klinla-or and Tongchai Sriwiriyarat |
| |
Institution: | 1. Environmental Science Program, Faculty of Science, Burapha University, Chonburi 20131, Thailand 2. Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi 20131, Thailand 3. Environmental Science Program, Faculty of Science, Burapha University, Chonburi 20131, Thailand;Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi 20131, Thailand |
| |
Abstract: | A coagulation-flocculation process is typically employed to treat the industrial wastewater generated by the consumer products
industry manufacturing detergents, soaps, and others. The expenditure of chemicals including coagulants and chemicals for pH
adjustment is costly for treating this wastewater. The objective of this study was to evaluate the feasibility of reusing the aluminum
sulfate (alum) sludge as a coagulant or as a coagulation aid so that the fresh alum dosage can be minimized or the removal e ciency can
be enhanced. The experiments were conducted in a jar-test apparatus simulating the coagulation-flocculation process for simultaneous
removals of organic matters, anionic surfactants, suspended solids, and turbidity. At the optimum initial pH value of 10 and the fresh
alum concentration of 400 mg/L, the total suspended solids (TSS), total chemical oxygen demand (TCOD), total anionic surfactants,
and turbidity removal e ciencies were 71.5%, 76.4%, 95.4%, and 98.2%, respectively. The addition of alum sludge as a coagulant
alone without any fresh alum addition could significantly remove the turbidity, TCOD, and anionic surfactants. The TSS was left in the
supernatants after the settling period, but would subsequently be removed by adding the fresh alum. The TSS, TCOD, and turbidity
removal e ciencies were also enhanced when both the alum sludge and the fresh alum were employed. The TCOD removal e ciency
over 80% has been accomplished, which has never fulfilled by using the fresh alum alone. It is concluded that the alum sludge could
be reused for the treatment of industrial wastewater generated by the consumer products industry. |
| |
Keywords: | alum sludge coagulation anionic surfactants consumer products |
本文献已被 维普 万方数据 ScienceDirect PubMed 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《环境科学学报(英文版)》下载免费的PDF全文 |
|