Abstract
The tofu industry produces liquid waste that can cause pollution if it is not processed first. Tofu liquid waste has the characteristics of containing high organic matter such as BOD and COD so that if it has directly discharged into the environment, it will reduce the carrying capacity of the environment. The purpose of this study was to determine and analyse the effect of variations in times and velocity of sequence batch reactor on the optimization of COD and BOD removal in tofu industrial wastewater by anaerobic bacteria originating from natural sediments. The method used is an experimental method where the method is to find the effect on other things controlled by using artificial waste. The removal of COD and BOD in tofu industrial wastewater can be done by biological treatment process with attached growth using Sequencing Batch Reactor. The reactor inoculated by the septic tank sediment was fed with artificial waste containing a concentration of COD of 7,000 mg/l and BOD of 2,000 mg/l. For 35 days, this reactor will be operated in batches. Results showed a decrease in BOD and COD parameters using a sequencing batch reactor with BOD concentration 176 mg/l and COD concentration 570 mg/l.
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