A STUDY ON THE IMPACT OF SLUDGE ON WATER QUALITY OF HORI RIVER

Abstract

The effect of sludge on water quality has big problems in Hori River, Nagoya, Japan. An observation is carried out to find out the relationship between the sludge and water quality at Naka Bridge of Hori River. Observations have done in the spring and neap tides using salinity, dissolved oxygen, turbidity, water temperature and ph as indicators. Moreover, experiment on the chemical parameters of water quality such as TN (inorganic form i.e. NH4-N, NO3-N, NO2-N) and TP were done in order to find out the impacts of sludge on the water for the improvement of better habitants of Hori River. Overall, TP and TN for the different two tides did not show any large variations and were fairly comparable. The pattern of water quality changed with the tides. For example, during spring tide, high DO levels were recorded and vice versa. At spring tide, the DO levels increased due to wave action and sea water intrusion. The sludge flushed into the river during spring tide of high velocity and exposure in the middle layers. Therefore, it noted that the water quality of the Hori River was greatly influenced by the tidal changes and the deposition of sludge.