Activation of Persulfate at Waste Heat Temperatures for Humic Acid Degradation

作者：Ike Ikechukwu A^*; Orbell John D; Duke Mikel

来源：ACS Sustainable Chemistry and Engineering, 2018, 6(3): 4345-4353.

DOI：10.1021/acssuschemeng.7b04840

• Humic acid
• Drinking water
• Persulfate
• Low-grade heat activation
• Disinfection byproducts
• Membrane fouling

Humic acid (HA) as a major constituent of natural organic matter (NOM) in raw water presents major challenges to drinking water production including membrane fouling and serving as a precursor for the production of disinfection byproducts (DBPs). This study demonstrates the feasibility of HA degradation by heat-activated persulfate (PS) mainly at a waste heat temperature of 40 degrees C, but also at 60 and 90 degrees C in which similar to 70% TOC loss was achieved within 168, 24, and 1 h, respectively. The use of waste heat for water treatment eliminates reliance on electricity, which is a requirement for conventional advanced oxidation processes. Heat-activated PS treatment of synthetic raw water at 40 degrees C was also shown to significantly reduce ultrafiltration membrane fouling. Low concentration of chloride (<= 0.9 mM) accelerated PS degradation of HA, but the promotion was lost at higher concentration (>= 9 mM). HA spiked into tap water was degraded by PS even at 25 degrees C, suggesting activation by trace minerals present within regulatory limits. Overall, the results of this study promise a sustainable and low-cost water treatment option.

• 出版日期2018-3