Tofu Liquid Waste Treatment Using Anaerob-aerobic Biofilm Aeration System to Reduce BOD COD and Ammoniac Content

Background: Tofu derived from processed soybeans is popular with the public, but tofu production has an unfavourable effect. After all, it produces liquid waste that causes quite high pollution because it contains quite high organic components. The study aimed to reduce the content of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and Ammonia in the liquid waste of a tofu factory. The scope of this research is limited to reducing the content of BOD, COD, and NH3 (Ammonia) with an anaerobic-aerobic biofilm aeration system. Materials and Methods: This research was conducted at the Sanitation Study Program Campus, health polytechnic, Ministry of Health, Jambi from March to August 2020. Sample examination was carried out at the Regional Health Laboratory of Jambi Province. This is an experimental study with a pre-post test only design and one group post-test design. The population in this study is the tofu industry, and the sample in this study is partly water from tofu waste. Results: The results showed a decrease in BOD, COD and Ammonia after passing through a tofu waste treatment machine using anaerobic and aerobic biofilms with BOD values of 64.6%, COD of 49.6% and Ammonia of 79.8%. The statistical test results showed that the p-value was 0.0001 for the decrease in BOD, the p-value was 0.0001 for COD, and the p-value for ammonia was 0.0001. A significant decrease in DOD, COD and Ammonia after passing through the waste treatment equipment with Anaerobic and Aerobic Biophiles. Conclusion: This tool can be used by adding several parts and treatments such as filtering, settling basins, and adding other chemical substances. On the surface of the bio ball used, it was found that the growth of biofilm was found and to increase the ability of the equipment, initial treatment was needed, such as filtration and sedimentation of waste, reducing acidity with the help of quicklime.