Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 420, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126558
Keywords
Disinfection by-products; Precursor; Coagulation; Al-based coagulants; Covalently bond hybrid coagulant
Categories
Funding
- National Natural Science Foundation of China [51822808, 51778445, 52091542]
- International Cooperation Project of Shanghai Science and Technology Commission [20230714100]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRC20018]
- Shanghai Soft Science Project [20692113900]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
This study compared the performance of aluminum sulfate, polyaluminum chloride, and a novel type of covalently bond hybrid coagulant in controlling regulated and unregulated DBPs and their associated toxicity. The results showed that the polyaluminum chloride achieved the most reduction in both DBP concentration and DBP-associated toxicity.
Coagulation is well-established for controlling regulated disinfection by-products (DBPs), but its effectiveness for controlling unregulated DBPs remains unclear. The efficiency of coagulation in controlling unregulated DBPs requires clarification owing to their relatively high toxicity. In this study, three Al-based coagulants, aluminum sulfate (Alum), polyaluminum chloride (PAC), and a novel type of covalently bond hybrid coagulant (CBC, synthesized using AlCl3) were selected, and the coagulation performance of these Al-based coagulants in controlling DBPs and DBP-associated toxicity was compared over 5 classes of DBPs, including trihalomethanes, haloacetic acids, haloacetaldehydes, haloacetonitriles, and halonitromethanes. The results showed that Alum was the least efficient in removing DBP precursors among the three coagulants. The effectiveness of CBC and PAC for DBP control varied with the characteristics of source waters. CBC had an advantage in water with a low content of humic acids, and reduced DBP concentration and DBP-associated toxicity by 47% and 25%, respectively. For water rich in aromatic organics, CBC might serve as DBP precursors at a high-required dosage, suggesting that a trade-off between enhanced DBP control and serving as DBP precursors should be considered for CBC coagulation; PAC achieved the most reduction in DBP concentration and DBP-associated toxicity by 50% and 34%, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available