E Environmental pollution in the Semanan area is due to the direct disposal of tempe industrial wastewater into water bodies without prior treatment. The purpose of this study was to obtain the effectiveness of moringa seed solution as a biocoagulant and the potential for liquid effluent as liquid organic fertilizer to reduce the disposal of untreated liquid waste and the reuse of tempe liquid waste. This study used the jar test method and stirred batch reactor with coagulation, flocculation, and sedimentation processes. Biocoagulant solution of Moringa seeds uses a concentration of 10% of Moringa seed powder with its skin and NaCl. The volume of the jar test sample was 500 mL of soaking process liquid waste with varying doses of biocoagulants namely 0, 10, 20, 30, 50, 70, 100, 500, 600, 700, and 800 mg/L. The variations of the stirring time were coagulation 2, 3, and 4 minutes and flocculation 10, 12, and 15 minutes. Jar test results with Moringa seed solution can remove 58% TSS, 69% turbidity, 88% BOD, and 75% COD with an optimum dose of 500 mg/L and optimum stirring time of 2 minutes coagulation (100 RPM), 45 minutes flocculation (40 RPM), and 60 minutes of sedimentation. The sample volume of the stirred batch reactor was 16 L of tempe liquid waste and 8 L of Moringa seed solution with a coagulation stirring time of 1 minute (100 RPM), flocculation of 10 minutes (20 RPM), and sedimentation of 60 minutes. The results of the stirred batch reactor showed that the Moringa seed solution was effective as a biocoagulant because it was able to remove > 50% of the parameters TSS, turbidity, BOD, and COD. However, the effluent results still do not meet the quality standards. The liquid effluent from the sludge of the stirred batch reactor test has no potential to be used as liquid organic fertilizer.