The liquid waste of the tofu industry contains high organic contaminants, such as proteins and amino acids. These organic compounds causes liquid waste of tofu industry to contain high BOD, COD, and TSS so that it can pollute the environment. Therefore, tofu liquid should be removed first by electrocoagulation method. This method has the potential to purify tofu liquid waste and decrease the content of COD, BOD, TSS, and pH contained without the addition of coagulants. The purpose of this study was to determine the effect of voltage and flow rate to neutralize pH, and reduce levels of COD, BOD, and TSS in tofu liquid waste. The parameters tested included COD, BOD, TSS, and pH. The electrocoagulation process uses electrical power that flows in the direction of the electrode. The electrocoagulation reactor was paired with a cable connected to the power supply then connected to an electric current with voltage and flow rate variations. The results of this study found that optimum conditions were obtained at current of 12 V and flow rate of 0.087 L/min with increasing pH from pH from 3.5 to 6.7, percent removal of COD 72.17%, percent removal BOD 71.53% , and percent removal TSS 90.90%.
Limbah cair industri pelapisan logam berasal dari hasil pembilasan pada proses pelapisan dengan Chrome, masih banyak terkandung zat berbahaya apabila langsung dibuang kelingkungan. Untuk itu perlu dilakukan pengolahan lebih lanjut dengan menggunakan elektrokoagulasi. Metode ini memiliki potensi penjernihan limbah cair pelapisan logam dan penurunan kandungan logam yang terkandung tanpa adanya penambahan koagulan. Tujuan dari penelitian ini untuk mengetahui penerapan metoda elektrokoagulasi untuk menetralkan pH, serta menurunkan kadar TSS dan Cr pada limbah dan untuk mengetahui pengaruh perubahan laju alir dan kuat arus untuk menetralkan pH, serta menurunkan kadar TSS dan Cr pada limbah. Parameter yang diuji meliputi pH, TSS (Total Suspended Solid), dan Cr. Proses elektrokoagulasi menggunakan listrik searah melalui elektroda. Reaktor elektrokoagulasi yang dipasangkan kabel ke power suplay kemudian disambungkan ke arus listrik dengan variasi kuat arus (1,2 ; 1,6 ; dan 2 A) dan variasi laju alir (0,78 ; 1,32 ; 2,7 L/menit). Hasil penelitian didapat kondisi optimum pada kuat arus 2 A dan laju alir 0,78 L/menit dengan kenaikan pH dari 4,5 menjadi 6,6, penurunan TSS dari 3,2 menjadi 1,2 mg/L, penurunan Cr sebesar 82,4 % dari 1,5 mg/L menjadi 0,263 mg/L.
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