Rachmawati, Rodhika (2020) Pengolahan Outlet Effluent Treatment IIIB Air Limbah Unit Produksi III untuk Memenuhi Kriteria Raw Water Proses Scrubbing PT Petrokimia Gresik. Other thesis, Sepuluh Nopember Institute of Technology.
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Abstract
PT Petrokimia Gresik Unit Pabrik III menghasilkan air limbah yang mayoritas kandungannya berupa fosfat dan fluor. Pada penelitian ini, pengambilan sampel dilakukan di Treated Water Effluent Treatment IIIB Unit Produksi III. Treated Water belum dimanfaatkan meskipun memiliki potensi untuk dimanfaatkan kembali sebagai raw water dalam proses scrubbing di unit Wet Scrubber Unit Produksi II.
Tujuan penelitian ini adalah menentukan dosis optimum koagulan utama aluminium sulfat dan koagulan pendukung kapur aktif atau PAC agar menghasilkan air untuk proses scrubbing, dilanjutkan dengan membuat Detail Engineering Design unit pengolahan dan menyusun RAB.
Dari penelitian ini diketahui bahwa parameter air untuk scrubbing yang belum memenuhi kriteria yang telah ditetapkan adalah COD, fluor, dan TSS. Untuk menurunkan konsentrasi parameter tersebut, dilakukan koagulasi dengan dosis optimum aluminium sulfat dan kapur aktif masing-masing dengan konsentrasi 50 – 60 mg/L. Selain itu juga dihasilkan 2 unit koagulasi, 1 unit flokulasi, dan 2 unit sedimentasi masing-masing mempunyai volume efektif 4,7 m3, 2,2 m3, 23,4 m3, dan 60 m3. Biaya yang diperlukan untuk pembangunan Rp 571.926.410 serta untuk biaya operasional berada dalam range Rp 2.617161.360 – Rp 3.001.720.700/tahun.
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PT Petrokimia Gresik Plant Unit III produces wastewater, the majority of which is phosphate and fluoride. In this study, sampling was conducted at Treated Water Effluent Treatment IIIB Production Unit III. Treated Water has not been utilized even though it has the potential to be reused as raw water in the scrubbing process in the Wet Scrubber Production Unit II. The purpose of this study was to determine the optimum dosage of aluminum sulphate main coagulant and active lime supporting coagulant or PAC to produce water for scrubbing process, followed by making the Detail Engineering Design of the processing unit and preparing the budget plan. From this study it is known that the water parameters for scrubbing that do not meet established criteria are COD, fluorine, and TSS. To reduce the concentration of these parameters, coagulation was carried out with optimum doses of aluminum sulfate and active lime each with a concentration of 50 - 60 mg / L. In addition, 2 coagulation units, 1 flocculation unit, and 2 sedimentation units were produced, each having an effective volume of 4.7 m3 , 2.2 m3 , 23.4 m3 , and 60 m3 . Costs needed for the construction of Rp 571,926,410 and for operational costs in the range of Rp 2,617,161,360 - Rp 3,001,720,700/year.
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