Penyisihan Krom (VI) Dengan Menggunakan Dried Activated Sludge

-, Francisco (2014) Penyisihan Krom (VI) Dengan Menggunakan Dried Activated Sludge. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan dried activated sludge (DAS) menjadi salah satu alternatif dalam penyisihan logam Cr (VI) pada air limbah. Proses penyisihan terjadi secara pasif melalui interaksi logam Cr (VI) dengan senyawa penyusun DAS serta tidak dipengaruhi oleh tingkat toksisitas logam. Beberapa parameter perlu diperhatikan dalam proses penyisihan logam Cr (VI) termasuk pH serta konsentrasi DAS. Penelitian ini bertujuan untuk menentukan kemampuan DAS serta pengaruh variasi konsentrasi Cr (VI) terhadap proses penyisihan Cr (VI). Variabel yang digunakan dalam penelitian ini yaitu variasi konsentrasi Cr (VI) dan variasi jenis DAS. Logam Cr (VI) yang digunakan berasal dari larutan K2Cr2O7 dengan variasi konsentrasi sebesar 50 mg/L, 100 mg/L, dan 150 mg/L. Jenis DAS berasal dari pengolahan limbah domestik (IPLT), pengolahan limbah industri (SIER), dan pengolahan limbah Rumah Pemotongan Hewan (RPH). Pengeringan dilakukan pada suhu 60 0C dan digunakan konsentrasi DAS sebesar 10 g/L. Penelitian ini dilakukan selama 24 jam dengan 6 kali pengukuran logam Cr (VI) yaitu pada jam ke 0, 1, 3, 5, 12, serta 24 menggunakan spektrofotometer UV-Vis. Analisis total krom dilakukan pada waktu ke 24 jam menggunakan spektrofotometer AAS (Atomic Absorption Spectrophotometer) untuk mengetahui Cr (III) yang terbentuk. pH 2 ditetapkan sebagai pH awal serta perubahan pH dan suhu diukur setiap pengambilan sampel. DAS hasil pengolahan limbah domestik dan industri terlihat lebih baik dalam menyisihkan 100 mg/L Cr (VI) hingga mencapai 50% tanpa penetapan pH awal. Namun, kemampuan penyisihan Cr (VI) pada semua variasi konsentrasi oleh ketiga jenis DAS meningkat hingga 99% pada kondisi pH 2. Penggunaan pH rendah dapat mempercepat proses penyisihan Cr (VI) akibat protonasi senyawa pada DAS. Mekanisme reduksi terjadi dalam proses penyisihan sehingga terbentuk Cr (III) dalam larutan. Peningkatan konsentrasi Cr (VI) menyebabkan konsentrasi Cr (VI) yang tersisihkan semakin besar pada waktu yang sama. ================================================================= Dried activated sludge (DAS) has been used as an alternative media to remove Cr (VI) in wastewater. The removal process was occurred through passive uptake by interaction with several functional groups of DAS which was resistance with metal toxicity. These parameters were necessary considered to remove Cr (VI) including pH and concentration of DAS. This study aims to investigate the prospect of DAS to remove Cr (VI) and to determine the effect of initial concentration of Cr (VI) in removal process. Variables used in this study were initial concentrations of Cr (VI) and DAS origins. Cr (VI) solutions were prepared using K2Cr2O7 with initial concentration of 50 mg/L, 100 mg/L and 150 mg/L Cr (VI). DAS was obtained from municipal sewage treatment plant (IPLT), industrial wastewater treatment plant (SIER), and slaughterhouse wastewater treatment plant (RPH). Each of DAS was dried at 60 0C and added 10 g/L of DAS for removal process. The experiment was conducted for 24 h with 6 times samples collection at 0, 1, 3, 5, 12 and 24 hours. Samples was analyzed spectrophotometrically for Cr (VI) concentration and AAS (Atomic Absorption Spectrophotometer) for total chromium to determine the existence of Cr (III). Initial pH of 2 was adjusted and the effect of pH and temperature were also investigated. The result showed that the removal of 100 mg/L Cr (VI) was well performed by 50% with DAS from sewage and industrial wastewater treatment plants, without pH adjustment. However, up to 99% of the removal efficiency was achieved in all concentration of Cr (VI) regardless of DAS origins, at initial pH 2. The removal process was accelerated with pH 2 due to protonation of functional groups of DAS. As higher initial concentration of Cr (VI) resulted in higher removal efficiency. The existence of Cr (III) was found in the solution as a result of Cr (VI) reduction mechanism.

Item Type: Thesis (Undergraduate)
Additional Information: RSL 628.357 Fra p
Uncontrolled Keywords: Cr (VI), Dried activated sludge (DAS), pH
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD646 Sewage--Purification
Divisions: Faculty of Civil Engineering and Planning > Environment Engineering > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 29 Sep 2017 05:36
Last Modified: 29 Sep 2017 05:36
URI: http://repository.its.ac.id/id/eprint/48884

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