Spirulina platensis is a type of blue -green algae that has a micro-sized spiral shape and lives in marine waters. There are so many benefits of this microalgae, one of which is it can degrade organic pollutants in wastewater. Excessive nitrate and phosphate in the water can cause eutrophication which is indicated by the death of many sea biotas because of phytoplankton bloom. In this research, tofu which high in organic pollutants are used as experimental test media. The microalgae which will be tested is cultivated first to obtain a sufficient amount for research, then the microalgae are acclimatized before being put into an Oxidation Ditch Reactor mixed with tofu waste with a capacity of 250 liters, ran with 60 rpm brush aerator for 7 x 24 hours and also uses natural lighting from sunlight. samples were taken once a day at 12 noon each day. This research has a variety of wastewater: algae that are 1:1. From the results, it can be observed that Spirulina platensis microalgae could reduce maximum phosphate by 33,15 %, from 18,1 mg/L to 12,1 mg/. Furthermore, microalgae also capable of decreasing nitrates by 46,07 from 0,89 mg/L to 0,48 mg/L.

Penelitian ini mendeskripsikan potensi biofuel mikroalga menggunakan Oxidation Ditch Algae Reactor. Produksi biomassa, klorofil a dan lipid Chlorella vulgaris meningkat seiring waktu dan diamati menjadi 2440 mg / L, 3,78 mg / L, dan 16,91% setelah 7 hari, dengan limbah tahu. Produksi biomassa, klorofil a dan lipid adalah 2050 mg / l, 2,4 mg / l, 14,34%, dengan limbah penyamakan kulit. Produksi biomassa, klorofil a dan lipid adalah 2430 mg / l, 3,47 mg / l, 16,79%. Produksi biomassa, klorofil a dan lipid Spirulina Plantesis meningkat seiring dengan bertambahnya waktu dan diamati bahwa 3320 mg / L, 4,81 mg / L, dan 23,86% setelah 7 hari, dengan limbah tahu produksi biomassa, klorofil a dan lipid meningkat. bersama waktu. dan mengamati 3210 mg / L, 2,67 mg / L, dan 19,34% setelah 7 hari, dengan limbah dari penyamakan produksi biomassa, klorofil a dan lipid dari Spirulina Plantesis meningkat dengan bertambahnya waktu dan diamati menjadi 2980 mg / L, 4 mg / L, dan 19,53% setelah 7 hari. Studi ini menunjukkan bahwa produksi biofuel dan pengolahan air limbah oleh Chlorella Vulgaris & Spirulina Plantesis menggunakan limbah tahu & limbah penyamakan kulit

Wastewater has been giving a high contribution to the quality of water bodies. Tofu wastewater is one of the contributors since it might contain high organic loading. Microalgae is one of the promising solutions to improve wastewater treatment, especially organic wastewater. However, every microalga has its specific properties and it will affect the quality of treated wastewater. This study aims to compare Chlorella vulgaris and Spirulina platensis in an oxidation ditch algae reactor (ODAR) for treating tofu wastewater. The ODAR system was set up under ratio wastewater and microalgae 1:1, the sample was taken every day for 7 days of observation. The sample was analyzed for BOD, DO, and Chlorophyll-a. The results showed that Spirulina platensis has a higher performance in removing organic pollutants than Chlorella vulgaris, which is shown 60% BOD removal, higher DO concentration (5-8 mg/L), and 2,67 mg/L of Chlorophyll-a. Performance of Spirulina plantesis in treating organic wastewater was indicated as a fast-growing microalga than Chlorella vulgaris.

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