Evaluation of alum-based water treatment residuals used to adsorb reactive phosphorus

Water Science and Engineering

Teresa J. Cutright¹  George Carleton² 

[1] Corresponding author.;Department of Civil Engineering, The University of Akron, Akron, OH 44235-3905, USA;

关键词: Phosphorous;    Alum;    Water treatment residuals;    Adsorption;    Desorption;    Powered activated carbon;   

DOI  :  

来源: DOAJ

【 摘 要 】

Excess reactive phosphorus (PO4) in waterways can lead to eutrophication. A low-cost approach to reducing PO4 levels in surface water was evaluated using the alum-based water treatment residual (Al-WTR) or Al-WTR augmented with powdered activated carbon (PAC-WTR). Batch adsorption-desorption and continuous flow column experiments were performed to assess the specific adsorption capacities under various concentration and flow conditions. Both Al-WTR and PAC-WTR exhibited the ability to adsorb PO4. The overall, cumulative sorbed amount after a 28-d desorption step for Al-WTR was 33.93 mg/kg, significantly greater than the PAC-WTR value of 24.95 mg/kg (p < 0.05). The continuous flow column experiments showed a theoretical PO4 uptake of 9.00 mg/g for Al-WTR and 7.14 mg/g for PAC-WTR over 720 h. When surface water was used, the Al-WTR and PAC-WTR columns removed 67.4% and 62.1% of the PO4, respectively. These results indicated that Al-WTR was more effective for in-field evaluation.

【 授权许可】

Unknown