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All Journal Equilibrium Journal of Chemical Engineering
Alamul Iman
Program Studi Teknologi Proses Industri Petrokimia, Politeknik Industri Petrokimia Banten, Jalan Raya Karang Bolong, Cikoneng, Kec. Anyar, Kab. Serang, Banten 42166
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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The Impact of Inject Chemical Neutralization toward the PH Change in the Reject Water Management on the Raw Water Treatment Facilities in Petrochemical Industries Rachmadi Tutuka; Ferry Ikhsandy; Rohiman Ahmad Zulkipli; Alamul Iman; Rizky Ibnufaatih Arvianto
Equilibrium Journal of Chemical Engineering Vol 9, No 2 (2025): Volume 9, No 2 December 2025
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v9i2.107710

Abstract

ABSTRACT. The water waste management in Petrochemical Industry becomes the significant challenge in maintain environmental quality—particularly in regulating pH levels in accordance with the standards set by Indonesia’s Ministry of Environment and Forestry Regulation No. 5 of 2014—chemical injection is widely employed. This method involves the addition of acidic or alkaline agents to neutralize the pH of reject water. This study evaluates the effect of varying chemical injection dosages to determine the optimal dose required to achieve a pH range of 6 to 9. The findings demonstrate a direct relationship between the increase in chemical injection dosage and changes in pH levels, where higher dosages consistently raised the pH, stabilizing at an average value of 8.2. Over a one-month monitoring period, the optimal dosage was identified as 0.085 m³, resulting in an average pH of 6.47. Excessive dosing is not only less effective but also led to increase operational costs, reaching up to IDR 872,235. Thus, optimizing chemical injection dosage is critical—not only for ensuring compliance with environmental pH standards but also for minimizing chemical consumption and reducing operational expenditures.Keywords:Inject chemicals, Wastewater treatment, pH, Reject water
Co-Authors Ferry Ikhsandy Rachmadi Tutuka Rohiman Ahmad Zulkipli