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Senin, 25 Agustus 2014

Abstract Rotating Biological Contactors (RBCs)


THE EFFECT VARIATION OF DETENTION TIME IN ROTATING BIOLOGICAL CONTACTORS (RBCs) PROCESSING UNIT WITH PVC MEDIA TO DECREASE CONCENTRATION OF PHOSPHATE IN LAUNDRY WASTEWATER


Laundry wastewater contains high concentration of phosphate but people discharge directly to river without processing it before. Some Communal Waste Water Treatment Plant (WWTP) do not receive laundry wastewater. The results of laboratory test showed that concentration of phosphate in laundry wastewater was 20,48 mg/l. Thus, it can cause environmental pollution, such as eutrophication. The research goal  is to know the effect variation of detention time 24, 48, and 72 hours in Rotating Biological Contactors (RBCs) processing unit with PVC media to decrease concentration of phosphate in laundry wastewater. This research type is experiment with pre test-post test design.The object of this research is laundry wastewater Eng in Tembalang, Semarang. The technical laboratory test of sample is using Vanadatmolybdate method and the data analysis use One Way Anova test then it is continued with Post Hoc Test. The result shows that average of phosphate concentration before processing is 18,73 mg/l, where is after processing within 24 hours is 7,25 mg/l, within 48 hours is 7,07 mg/l, and within 72 hours is 3,61 mg/l. Decreasing phosphate concentration of laundry wastewater within 24 hours is 61,12%, within 48 hours is 62,07, and within 72 hours is 80,51%. Statistical result by One Way Anova showed that there is average difference from decreasing phosphate concentration in laundry wastewater (p-value=0,002). It is suggested to use 72 hours detention time to decrease concentration of phosphate as the decreasing effect is highest than others, althought hasn’t fulfill the regulation.

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