Sains Malaysiana 48(11)(2019): 2381–2390

http://dx.doi.org/10.17576/jsm-2019-4811-09

 

The Effect of Persulfate Oxidation on the Biodegradability of Concentrated Anaerobic Stabilized Leachate

(Kesan Pengoksidaan Persulfat terhadap Keterbiodegredan Pekatan Larut Lesap Anaerob Stabil)

 

AHMED H. HILLES1, SALEM S. ABU AMR2, ABBAS F.M. ALKARKHI*2 & MD SOHRAB HOSSAIN3

 

1Environment Quality Authority, Palestinian Authority, Palestine

 

2Malaysian Institute of Chemical & Bioengineering Technology, Universiti Kuala Lumpur (UniKL, MICET), 78000 Melaka, Malaysia

 

3Division of Environmental Technology, School of Industrial Technology, Universiti Sains Malaysia, 11800 Penang, Malaysia

 

Diserahkan: 3 April 2019/Diterima: 15 Ogos 2019

 

ABSTRACT

Anaerobic stabilized landfill leachate was treated by persulfate (S2O82−) oxidation. The effect of three factors namely; persulfate dosage, pH and reaction time on COD and NH3-N removals; was studied. The results of analysis of variance (ANOVA) showed that the selected factors significantly affected the percentage of COD and NH3-N removals. Furthermore, the maximum removal was achieved at 60 min of persulfate oxidation, a COD/S2O82− ratio (1 g/4.2 g), and pH7, the percentage of removals for COD and NH3-N were 45% and 55%, respectively. The effect of persulfate oxidation on the biodegradability of leachate was also investigated. The results showed that the BOD5/COD ratio improved from 0.09 to 0.1. The oxidation enhanced the biodegradable (CODbi) from 36% to 57%. Hence, persulfate is suitable to pre-treat highly-concentrated stabilized leachate. This process should follow the organic degradation and ammonia removal followed by biological treatment processes.

 

Keywords: ANOVA; biodegradability; landfilling leachate; persulfate; Tukey's test

 

ABSTRAK

Larut lesap stabil anaerob telah dirawat secara pengoksidaan persulfat ((S2O82−). Kesan tiga faktor iaitu dos persulfat, pH dan masa tindak balas terhadap penyingkiran COD dan NH3-N telah dikaji. Ujian ANOVA menunjukkan faktor tersebut memberi kesan yang bererti terhadap peratusan penyingkiran COD dan NH3-N. Seterusnya penyingkiran maksimum COD dan NH3-N masing-masing sebanyak 45% dan 55% telah dicapai pada masa 60 minit, nisbah COD/S2O82− pada 1 g/4.2 g dan pada pH7. Kesan pengoksidaan persulfat terhadap keterbiodegredan larut lesapan juga dikaji. Hasil kajian menunjukkan nisbah BOD5/COD meningkat daripada 0.9 kepada 1.0. Pengoksidaan telah meningkatkan biodegredasi (CODbi) dari 36% kepada 57%. Dengan ini, persulfat sesuai merawat larut lesap stabil yang berkepekatan tinggi. Proses ini seharusnya diikuti dengan degredasi bahan organik dan penyingkiran ammonia melalui proses rawatan secara biologi.

 

Kata kunci: ANOVA; keterbiodegredan; larut lesapan; persulfat; ujian Tukey

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*Pengarang untuk surat-menyurat; email: Abbas@unikl.edu.my

 

 

 

 

 

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