Removal of Natural Organic Matter (NOMs) from Water Using Air Stripping System

Pollution of water resources to organic matters and their associated problems including taste، odor، and formation of disinfectant by-products require evaluating removal methods for these materials from drinking water. This study aimed to evaluate performance of organic matter removal from water using deaerating system. A PVC pilot deaerator tower (diameter=15، height=140 cm) was designed، constructed، and used for this study. The system was loaded in flow rates of 0. 6، 0. 8، 1، 1. 2، and 1. 5 l/min. Absorption of samples were measured at wavelength of 253. 7 nm and COD was determined for all samples. COD levels and absorption rates of samples decreased with time for flow rates of. 6، 0. 8، 1، and 1. 2 l/min. However، absorption rates and CODs increased with increasing flow rate (except for flow rate of 1. 5 l/min). Deaeration tower system has capability to remove organic matters from water and the highest efficiency was observed at low flow rates. In addition، significant relationships (R2>0. 95) was observed between COD and absorption rates (except for flow rate of 1. 5 l/min)، and that COD may be measured through determination of absorption rate at UV wave length.