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

Received: 3 April 2019/Accepted: 15 August 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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*Corresponding author; email: Abbas@unikl.edu.my