Determination of the Effectiveness of Sedimentation

 

 

 

After the industrial era, there was an urge worldwide to form bodies which would govern the environmental issues due to excessive environmental malpractices. Sedimentation tanks are designed to have optimal sedimentation speed to allow effluents to settle. They are often used as the pre-treatment unit for the effluents.

 

Using the standard laboratory procedures, effluents were test for the following physicochemical parameters: pH, Temperature, TSS, TDS, COD and BOD.

 

The results were obtain was found to range between 9.15- 9.35, 5.39-5.67 and 8.99-9.20 for pH in day 1,2 and 3 for inlets and 9.98- 10.20, 4.72-4.99 and 9.82-10.15 for pH in day 1,2 and 3 for outlets, temperature range was between 22.5-27.8 ‘C, TSS values (170-175)mg/L, (260-265)mg/L, (230-232)mg/L for day 1,2 and 3’s inlets and (120-125)mg/L, (98-215)mg/L, (172-180)mg/L for day 1,2 and 3’s outlets, TDS values (540-565)mg/L, (180-183)mg/L, (598-603)mg/L for day 1,2 and 3’s inlets and (170-175)mg/L, (260-265)mg/L, (230-232)mg/L for day 1,2 and 3’s outlets, COD values (1020-1025)mg/L, (325-330)mg/L, (2650-2653)mg/L for day 1,2 and 3’s inlets and (985-990)mg/L, (312-315)mg/L, (2580-2590)mg/L for day 1,2 and 3’s outlets and finally for BOD values (299-301)mg/L, (135-140)mg/L, (874-880)mg/L for day 1,2 and 3’s inlets and (1020-1025)mg/L, (125-130)mg/L, (800-805)mg/L for day 1,2 and 3’s outlets.

           

Results obtained show that values of the physicochemical parameters assessed reduces significantly as they passed through sedimentation tank. Values from the outlet were compared from the one stipulated by NEMA and most of parameters were found to be within the required range. Sedimentation tanks are used to fight against pollution. Better results can be achieved when two to three sedimentation tanks are used in series.

 

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