Treatment and kinetic study of cyanobacterial toxin by ozone

被引:39
作者
Al Momani, Fares A. [1 ]
Jarrah, Nabeel [1 ]
机构
[1] Mutah Univ, Dept Chem Engn, Al Karak, Jordan
来源
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING | 2010年 / 45卷 / 06期
关键词
Absorbance decay; cyanobacterial; kinetic; ozonation; toxicity; WATER-TREATMENT PROCESSES; DRINKING-WATER; MICROCYSTIN-LR; HUMAN FATALITIES; OZONATION; DECOMPOSITION; OXIDATION; REMOVAL; CARUARU; LAKE;
D O I
10.1080/10934521003648933
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A rapid scan-stopped flow (RS-SF) reactor was used to study reaction between ozone and cyanobacterial toxins [microcystin-LR (MC-LR) and microcystin-RR (MC-RR)] at different pH values and over a temperature range of 20-30 degrees C. The ozonation reaction was very effective for elimination of microcystin; solutions of concentration up to 5 mg/L MC-LR were totally oxidized by an ozone dosage of 2 mg/L. Reactions were dependent on ozone dose, temperatures, and pH. A more effective reaction took place at a higher ozone dose, higher temperatures, and more acidic pH. Spectrophotometer analysis was used to study the ozonation kinetics. Reactions were very fast: with an initial ozone concentration of 2 mg/L the half-life time of the toxins was less than 20 s. Ozonation reaction was successfully modeled to an overall second-order kinetics and with first-order kinetics for both ozone and toxins. Overall rate constants (K) were found to be 6.79 x 10(4) M(-1)s(-1) for MC-LR and 2.45 x 10(5) M(-1)s(-1) for MC-RR at 20 degrees C, with a pH of 2. The main degradation intermediates and the toxicity of the treated solution were also evaluated. The identified by-products were related to ozone dose. The high available ozone concentration degraded the toxins into smaller by-products and led to a ring opening. On the other hand, at a low ozone dose larger intermediates were detected. The treated solution toxicity was also found to be related to the ozone available in the aqueous solution; a high ozone dose led to cleavage of the Adda side chain from the toxin and reduced the toxicity.
引用
收藏
页码:719 / 731
页数:13
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