Analysis and solution of abnormal PH in Shang Lake

Objective:To find out the reasons of abnormal pH value of raw water in Shang lake,and to deal with them by proper measures.Methods: Based on the field investigation,the relation of pH value with climate,dissolved oxygen,total hardness,total alkalinity,the number of algae of Shang Lake during 2007 and 2008 were analyzed.Results: In the east areas of Shang Lake,the strong photosynthesis of multiplying submerged plants led raw water pH value to increase abnormally,and restrained the growth of algaes.Conclusion: The multiplying of submerged plants purified the raw water quality.In water plant,the raw water pH value was adjusted to normal level by adding hydrochloric acid,to make sure the safety of drinking water.