DESIGN OF COOLANT WASTE WATER PRE-TREATMENT PLANT 2C PT. C

• Main Author: ROMAULINA (NIM: 15314023), RENI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30322
• Institution: Institut Teknologi Bandung

Coolant waste generated from the machining process at PT. X cannot be processed by WWTP that operates because the concentration of COD pollutants, metals and oils in coolant waste has exceeded the basic limits of WWTP influent planning so that the coolant waste treatment is handed over to a third party, Prasadha Pamunah Limbah Industri (PPLI). The coolant waste produced is 400L / day. To treat coolant waste in WWTP, pre-treatment is needed so that the coolant waste can be processed in WWTP. The alternative treatment for coolant waste is the electrocoagulation process. Electrocoagulation is a coagulation process using direct electric current through electrochemical events. Electrocoagulation laboratory experiments are carried out in batches using aluminum electrodes, with variations in voltage of 5, 7.5 and 10 Volts, time variation 0; 10; 20; 30; 40; 50 and 60 minutes, the variation between electrode distances is 1 and 1.5 cm and also the variation of the electrode area (9x5) cm and (9x4) cm. Experiments showed that the best results were obtained at a voltage of 10 V, operating time of 60 minutes and the distance between electrodes of 1 cm with an area of electrode (9x5) cm. The electrocoagulation reactor can reduce BOD5 concentration with an efficiency of 91.8% from 5000 mg / l to 410 mg / l, followed by 85.4% COD from 83000 mg / l to 12120 mg / l, iron 99.9% from 127 mg / l to 0.0808 mg / l, manganese 99.9% from 11 mg / l to 0.009 mg / l, copper 99.2% from 1.32 mg / l to 0.0104 mg / l and mineral hydrocarbon oil with 96.7% efficiency from 2768 mg / l to 91 mg / l. Thus the electrocoagulation method can be used as a pre-treatment for coolant waste so that the coolant waste can be processed in the treatment of WWTP. The flocs formed from the electrocoagulation process will enter the mixing process. Recapitulation of capital costs reaches Rp 140,655,554.90.