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
Diserahkan:
5 Mei 2011/Diterima: 23 Januari 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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*Pengarang
untuk surat-menyurat; email: chgan26@yahoo.co.uk
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