Malaysian Journal of Analytical Sciences Vol 18 No 3 (2014): 695 - 699

 

 

 

HYDROTHERMAL OXIDATIVE DEGRADATION OF ORGANIC COMPOUNDS DERIVED FROM PRODUCED WATER

 

(Penguraian Secara Pengoksidaan Hidrotermal Bahan Organik daripada Air Hasilan)

 

Ahmad Rafizan Mohamad Daud*, Mohd Zahid Marzuki, Mohd Muslim Abu Hassan

 

Faculty of Chemical Engineering,

Universiti Teknologi Mara (UiTM), 40450 Shah Alam, Selangor, Malaysia

 

*Corresponding author: ahmad2057@salam.uitm.edu.my

 

 

Abstract

Produced water contains various hazardous organic compounds such as BTEX (benzene, toluene, ethyl benzene and xylene), phenolics and polycyclic aromatic hydrocarbons (PAHs). These compounds are stable and difficult to degrade by conventional wastewater treatment method. Aqueous based hydrothermal oxidative method is viewed as a promising approach for produced water treatment. The experiment was conducted in a micro-bomb reactor at subcritical water condition (200-300 ^oC) and 30 minute reaction time. Hydrogen peroxide was used as an oxidant. The reaction products were analyzed using a Fourier Transform Infra-Red (FTIR) and a Gas Chromatography-Mass Spectroscopy (GC-MS). The hydrothermal treatment in the absence of an oxidant showed minimal degradation of organics for the temperature range investigated. With the presence of an oxidant, the organics degradation increased drastically to near completion within the 30 minute reaction time at 300 ^oC. The results indicated that most of the organic compounds found in the produced water were successfully degraded using hydrothermal oxidative method.

 

Keywords: Produced water, organic, degradation, hydrothermal, oxidation

 

Abstrak

Air hasilan mengandungi pelbagai bahan organik berbahaya seperti BTEX (benzena, toluena, etil benzena dan xylene), fenol dan hidrokarbon polisiklik aromatik (PAHs). Bahan-bahan ini adalah stabil dan sukar untuk diuraikan dengan menggunakan kaedah rawatan air sisa buangan konvensional. Kaedah rawatan berasaskan air seperti pengoksidaan hidrotermal dilihat sebagai satu kaedah yang berpotensi untuk rawatan air hasilan. Eksperimen telah dijalankan menggunakan reaktor bom mikro pada keadaan air dibawah paras kritikal (200-300 ^oC) dan masa tindakbalas 30 minit. Hidrogen peroksida telah digunakan sebagai ejen pengoksidaan. Hasil tindakbalas telah dianalisa menggunakan peralatan Fourier Transform Infra-Red (FTIR) dan Gas Chromatography-Mass Spectroscopy (GC-MS). Hasil kajian pada keadaan air dibawah paras kritikal mendapati rawatan secara hidrotermal tanpa sokongan ejen pengoksidaan tidak berupaya untuk menguraikan bahan organik. Penggunaan ejen pengoksida seperti hydrogen peroksida telah meningkatkan tahap penguraian bahan organic secara drastic menghampiri tahap penguraian sepenuhnya dalam jangkamasa 30 minit pada suhu 300 ^oC. Hasil kajian juga menunjukkan kebanyakan bahan organik yang terdapat didalam air hasilan telah berjaya diuraikan menggunakan kaedah pengoksidaan hidrotermal.

 

Kata kunci: Air hasilan, penguraian, organik, hidrotermal, pengoksidaan

 

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