Water Quality Deterioration in Artificial Lake: Their Impact and Sources

Seven sampling stations were identified to determine the status of water quality in Cempaka Lake, Bandar Baru Bangi within two sampling periods of June 2010 and August 2010. The objectives of the study are to identify and classify the current water quality in the lake. A total of twelve water quality parameters have been analyzed in-situ and ex-situ and classified under WQI and NWQS classifications, four parameters were analyzed using HYDROLAB meter DataSonde, eight parameters were analyzed under the standard of the HACH and APHA methods. The results are pH  between 6.13 to 6.92, DO 1.63 to 4.94 mg/L, temperature 26.02 to 28.37 ºC, conductivity of 94 to 213mS/cm, BOD  0.38 up to 2.4 mg/L, NH3-N  2.00 to 2.84 mg/L, phosphate 0.21 to 0.56 mg/L, sulphate 21 to 35 mg/L, COD 9.3 to 69 mg/L, TSS of 1.8 to 33.3 mg/L, oil and grease 5.7 to 11.8 mg/L  and hardness 13.89 to 35.57 mg/L. Based on this classification, the water quality of Cempaka Lake was classified as Class II and III. The results are clearly shown that the majority of the water quality parameters in the study area are more polluted during the first sampling compared to the second sampling. Cempaka Lake has been contaminated due to residential activities, clinic centres, restaurants, petrol pump stations that release discharge into streams, rivers and eventually the lake become a brownish color and a smell of ammonia.