Details

Autor(en) / Beteiligte

• Shen, Cangliang
• Norris, Pauline
• Williams, Olivia
• Hagan, Stephanie
• Li, KaWang

Titel

Generation of chlorine by-products in simulated wash water

Ist Teil von

• Food chemistry, 2016-01, Vol.190, p.97-102

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• •Haloacetic acids (HAAs) and trihalomethanes (THMs) were measured in a dynamic chlorinated wash water system.•Measured concentrations of HAAs and THMs exceed the US-EPA and EU standards.•HAAs significantly correlated with chemical oxygen demand levels.•THMs significantly correlated with free chlorine concentrations. Free chlorine (FC) reacting with organic matter in wash water promotes the formation of chlorine by-products. This study aims to evaluate the dynamic impact of FC and organic load on the generation of haloacetic acids (HAAs) and trihalomethanes (THMs) in simulated wash water. Lettuce juice was sequentially added into FC solution with FC periodically replenished. Water samples were collected after each lettuce juice addition to measure water qualities and determine HAAs and THMs using US-Environmental-Protection-Agency (EPA) methods. Concentrations of 88–2103μg/l of total HAAs and 20.79–859.47μg/l of total THMs were detected during the study. Monobromoacetic, tribromoacetic, chlorodibromoacetic and trichloroacetic acid were the major HAAs components. Chloroform (trichloromethane) was the primary THMs present. A significant correlation of HAAs with chemical oxygen demand and THMs with FC was observed. Results indicated that optimizing wash water sanitizing systems to limit organic matters and maintain minimal effective FC concentration is critical.