Assessment of chlorinated water impact on phytoplankton

Abstract

The research of chronicle impact of chlorinated drinking water on phytoplankton was carried out for proving the negative influence of by-products of water chlorinating. For this purpose the river and well water with phytoplankton were chlorinated by different doses of sodium hypochlorite. The content of free residual chlorine was measured and visual observation of the samples was carried out after 90 days. Phytoplankton activity was decreased with sodium hypochlorite dose increasing. It was noticed that more phytoplankton remained in the samples of well water compared to samples of river water. This proves the theory of chlorination by-products increasing with increasing of organic substances concentration in the water. Besides, sodium hypochlorite dose providing the concentration of free residual chlorine under the limit probably does not destroy all pathogenic organisms.