Impact of dissolved wastewater constituents on peroxidase-catalyzed treatment of phenol

✍ Scribed by Monika Wagner; James A Nicell

• Publisher: Wiley (John Wiley & Sons)
• Year: 2002
• Tongue: English
• Weight: 184 KB
• Volume: 77
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.571

✦ Synopsis

Abstract

The impact of dissolved wastewater constituents on the treatment of synthetic phenol solutions using horseradish peroxidase (HRP) and hydrogen peroxide was investigated under a variety of reaction conditions. The constituents studied included various inorganic salts, organic compounds and heavy metals. Higher H~2~O~2~ doses were required to treat phenol in the presence of sodium sulfite, thiosulfate and sulfide; however, enhanced levels of phenol conversion were achieved once sufficient H~2~O~2~ was supplied. Sulfide and cyanide inhibited phenol transformation. The inhibition of sulfide was overcome by supplying sufficient H~2~O~2~ to oxidize the sulfide to sulfur. However, increasing the H~2~O~2~ dose was ineffective in attempting to overcome the strong inhibiting effect of cyanide. Among the heavy metal ions tested, only Mn(II) substantially inhibited phenol removal when it was present at a concentration of 1 mmol dm^−3^. The presence of inorganic salts including NaCl, CaCl~2~, MgCl~2~, NH~4~Cl and (NH~4~)~2~SO~4~ reduced phenol conversion as compared with the treatment in distilled‐deionized water. This can be attributed to the increased ionic strength of the solution.

© 2002 Society of Chemical Industry