Effect of various reaction parameters on THMs aqueous sonolysis

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies
• Acoustic Chemistry

Background:

• Trihalomethanes (THMs) are common disinfection byproducts in drinking water.
• Concerns exist regarding the health effects and environmental persistence of THMs.
• Effective methods for THM removal are crucial for water safety.

Purpose of the Study:

• To investigate the sonodegradation of various THMs using ultrasonic irradiation.
• To determine the influence of key parameters (pH, temperature, initial concentration) on THM removal efficiency.
• To assess the feasibility of ultrasonic treatment for THM abatement.

Main Methods:

• Sonodegradation of five specific THMs (including chloroform and bromoform) was studied.
• Acoustic frequency of 20 kHz was employed for ultrasonic irradiation.
• Experiments were conducted across a range of pH (3-10), temperatures, and initial THM concentrations (10-300 mg/L).

Main Results:

• Ultrasonic irradiation demonstrated effectiveness in degrading THMs.
• Increased solution temperature significantly enhanced THM sonodegradation rates.
• Initial aqueous solution pH (3-10) had a negligible effect on THM degradation.
• Higher initial THM concentrations (up to 300 mg/L) reduced the sonolysis efficiency.

Conclusions:

• Ultrasonic irradiation is a viable method for THM destruction.
• Temperature is a critical factor positively influencing THM sonodegradation.
• The process is relatively insensitive to pH variations within the studied range.
• Optimizing initial THM concentration is important for maximizing treatment efficiency.