Pengolahan Limbah Cair Tahu dengan Metode Kombinasi Sedimentasi, Biofilter Anaerob, dan Fitoremediasi dalam Menurunkan Kadar BOD Dan COD

2023-09-25

en

Thesis

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Background: Preliminary survey of tofu industrial waste in Bogoran Trirenggo Village, Bantul, revealed that the BOD parameter value of the wastewater was 3428.03 mg/l and the COD level was 4941.57 mg/l. The liquid waste from tofu contains high levels of organic compounds and does not meet the quality standards required by the Governor of DIY Regulation No. 7 of 2016 concerning the Quality Standards for Liquid Waste for Tofu Industry Activities. Objective: Therefore, it is necessary to treat the waste from the tofu industry to reduce the levels of BOD and COD. Method: This study used a combination of Sedimentation, Anaerobic Biofilter, and Phytoremediation methods. It employed a “Pretest-Posttest with Control Group” research design, consisting of a treatment group in the anaerobic biofilter process using banana stem-fiber and a control group, with a total sample of 12 samples from the liquid waste of Mr. Suwanto’s tofu industry in Bogoran Trirenggo Village, Bantul. The research data was analyzed descriptively and analytically. Data analysis used a normality test with the Shapiro-Wilk test, followed by a T-Test. Results: The average post-treatment results of the tofu wastewater BOD parameter for the anaerobic biofilter treatment using banana stem-fiber was 2508.30 mg/l, and for the treatment with fiber biofilter was 2847.26 mg/l. The COD parameter yielded post-treatment results of 1774.41 mg/l for the anaerobic biofilter treatment using banana stem-fiber, and an increase of 6958.40 mg/l for the anaerobic biofilter using fiber. There was a decrease in BOD levels by 30.16% for the anaerobic biofilter treatment using banana stem-fiber and by 6.83% for the treatment using fiber. Meanwhile, the COD parameter experienced a decrease of 44% for the anaerobic biofilter treatment using banana stem-fiber and an increase of 8% for the treatment using fiber. Conclusion: The treatment of liquid waste from the tofu industry using a combination of sedimentation, anaerobic biofilter (banana stem-fiber), and phytoremediation was not effective in improving the quality of the tofu wastewater BOD and COD parameters. The results of the analysis of the decrease in BOD levels are evidenced by a p-value of > α (0.05), indicating that there is no significant difference in the BOD levels of tofu wastewater treatment with fiber biofilter compared to banana stem biofilter group. Meanwhile, the COD levels of the tofu wastewater treatment in the fiber biofilter group compared to the banana stem biofilter group have a value of sig. < than α (0.05), but there is a significant difference due to the spike in COD values from the control group affecting the treatment group. Thus, it affects the analytical test results, where Ho cannot be rejected and Hα is accepted.