Sains Malaysiana 42(7)(2013): 893–902

 

Combined UV/Fenton and SBR Treatment of a Semi-aerobic Landfill Leachate

(Penggabungan Rawatan UV/Fenton dan SBR untuk Larut Resapan dari

Tapak Pelupusan Semi-aerobik)

 

 

Gan Chin Heng* & Malay Chaudhuri

Department of Civil Engineering, Universiti Teknologi PETRONAS

Bandar Seri Iskandar, 31750 Tronoh, Perak Darul Ridzuan, Malaysia

 

Emad Soliman Elmolla

Department of Civil Engineering, Al-Azhar University, Cairo, Egypt

 

Received: 5 May 2011/Accepted: 23 January 2013

 

ABSTRACT

This study examined the combined UV/Fenton and sequencing batch biological reactor (SBR) treatment of a semi-aerobic landfill leachate. Fenton pretreatment of the leachate was optimized by the response surface methodology (RSM). UV/Fenton pretreatment of the leachate was performed under the optimum operating conditions of the Fenton pretreatment (H2O2/COD molar ratio 2.25, H2O2/Fe2+ molar ratio 10.0 and reaction/irradiation time 1.5 h). The characteristics of the UV/Fenton pretreated leachate were: COD 390 mg/L, sCOD 330 mg/L, BOD5 136 mg/L, BOD5/COD ratio 0.35, NH3-N 112 mg/L, TKN 157 mg/L, NO3--N 6.8 mg/L and colour 99 Pt-Co Unit. SBR treatment of the UV/Fenton pretreated leachate resulted in sCOD, BOD5 and NH3-N removal of 78%, 81% and 88%, respectively. The final effluent characteristics were: COD 92 mg/L, sCOD 71 mg/L, BOD5 26 mg/L, NH3-N 7 mg/L, NO3--N 27 mg/L, TKN 13 mg/L and TSS 38 mg/L. The effluent met the Malaysian discharge standard (B) – COD 100 mg/L, BOD5 50 mg/L and TSS 100 mg/L. Combined UV/Fenton and SBR is an effective treatment for mature leachate from semi-aerobic landfill.

 

Keywords: Mature landfill leachate; response surface methodology (RSM); sequencing batch biological reactor (SBR); UV/Fenton

 

ABSTRAK

Kajian ini adalah untuk menyelidik tentang penggabungan rawatan UV/Fenton dan reaktor biologi kumpulan jujukan (SBR) untuk larut resapan dari tapak pelupusan yang semi-aerobik. Rawatan awalan dengan Fenton dioptimumkan oleh kaedah sambutan permukaan (RSM) terhadap larut resapan. Rawatan awalan untuk larut resapan dengan UV/Fenton dilaksanakan di bawah keadaan optimum daripada rawatan awalan dengan Fenton (H2O2/COD 2.25, nisbah molar H2O2/Fe2+ 10.0 dan masa tindak balas selama 1.5 jam). Ciri-ciri larut resapan selepas rawatan UV/Fenton adalah: COD 390 mg/L, sCOD 330 mg/L, BOD5 136 mg/L, nisbah BOD5/COD 0.35, NH3-N 112 mg/L, TKN 157 mg/L, NO3--N 6.8 mg/L dan warna 99 Pt-Co Unit. Rawatan SBR untuk larut resapan selepas UV/Fenton memberi keputusan dalam sCOD, BOD5 dan NH3-N dengan penyingkiran 78%, 81% dan 88% masing-masing. Ciri-ciri efluen akhir adalah: COD 92 mg/L, sCOD 71 mg/L, BOD5 26 mg/L, NH3-N 7 mg/L, NO3--N 27 mg/L, TKN 13 mg/L dan TSS 38 mg/L. Efluen tersebut memenuhi syarat-syarat dalam Akta Kualiti Alam Sekitar – COD 100 mg/L, BOD5 50 mg/L dan TSS 100 mg/L. Penggabungan rawatan UV/Fenton dan SBR merupakan satu rawatan yang efektif untuk larut resapan dari tapak pelupusan yang semi-aerobik.

 

Kata kunci: Kaedah sambutan permukaan (RSM); larut resapan yang lama; reaktor biologi kumpulan jujukan (SBR);  UV/Fenton

 

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*Corresponding author; email: chgan26@yahoo.co.uk

 

 

 

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