Abstract
Four identically designed and constructed Capillary-Gravitational Slow Sand Filter (SSF) with different in its overflow media height were parallelly operated to filtered tofu liquid waste for the purpose to identify responses of debit and quality of permeate with the change of overflow media height. The experiment was conducted following 4x4 LS with the overflow media height as the treatment. Besides the debit for clear and polluted water, samples of the liquid waste and the permeate were taken and analysed for TSS, Turbidity, pH, BOD and COD. Result of analysis showed that debit of SSF was 182.6 -252.1 ml/minute for clear water; 81.3 – 153.5 ml/minute for tofu liquid waste; TSS 7.5 – 20.5 mg/L; Turbidity 0.58 – 3.84 NTU; pH 6.8 – 7.2; BOD 1.7 – 35.4 mg/L; COD 3.8 – 108.0 mg/L with removal efficiency more 96% when overflow media 4 cm or more. In conclusion, the SSF Grapilar reduced when it was used to filter polluted water. In terms of pollutant removal, SSF Grapilar was effective; it was able to remove more than 95% of TSS, Turbidity, BOD, COD and neutralized permeate of tofu liquid waste when the overflow media height was 4 cm or more.
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