Comparison and optimization of ozone –based advanced oxidation processes inthe treatment of stabilized landfillleachate
Perbandingan dan pengoptimuman proses-prosespengoksidaan lanjutan berasaskan ozon dalam olahanlarut lesapan stabil
- Tez No: 770902
- Danışmanlar: DR. HAMİDİ ABDUL AZİZ
- Tez Türü: Doktora
- Konular: Çevre Mühendisliği, Environmental Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: Unıversıtı Saıns Malaysıa
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Pencemaran larut lesapan merupakan salah satu masalah utama di tapak pelupusan. Antara parameter yang paling bermasalah bagi larut lesapan stabil adalah COD, ammonia, dan warna. Teknologi olahan yang boleh digunakan adalah berbeza berdasarkan jenis larut lesapan yang terhasil. Walaupun selepas olahan, ciri-ciri efluennya masih sukar untuk mematuhi standard pelepasan. Pengozonan merupakan salah satu proses kimia yang boleh digunakan dalam olahan larut lesapan kambus tanah. Walau bagaimanapun, prestasi pengozonan adalah rendah apabila digunakan secara bersendirian; keberkesanannya dapat dipertingkatkan melalui proses pengoksidaan lanjutan. Sehingga kini, penggunaan reagen Fenton dan persulfate secara berasingan bagi meningkatkan process pengozonan dalam satu reaktor ozon masih belum terbukti. Justeru itu, kajian ini dijalankan untuk menilai dan membandingkan prestasi tiga proses olahan, iaitu ozon, ozon/Fenton dan ozon/persulfate di dalam mengolah larut lesapan stabil yang dijalankan secara berasingan mengikut keadaan ujikaji yang berbeza. Satu reka bentuk komposit tengah“Cental Composite Design”(CCD) dengan kaedah tindak balas permukaan“Response Surface Methodology”(RSM) telah digunakan untuk menilai hubungan di antara pembolehubah operasi. Berdasarkan analisis statistik, model kuadratik bagi empat tindak balas (COD, NH3-N, warna, dan penggunaan ozon (OC)) telah terbukti menunjukkan kesan ketara dengan nilai kebarangkalian yang sangat rendah (<0.0001). Bagi ketiga-tiga reka bentuk pengoptimuman tersebut, keputusan yang diramal adalah hampir menyamai keputusan ujikaji di makmal. Selain itu, kajian ini juga dijalankan untuk mengkaji kesan ketiga-tiga proses olahan terhadap biodegradasi dan ciri-ciri terlarut dalam larut lesapan stabil. Nisbah kebolehbiodegradasi (BOD5/COD) dalam larut lesapan stabil telah meningkat daripada 0.034 kepada masing-masing 0.05, 0.14 dan 0.29 menggunakan O3, O3/fenton dan and O3/persulfat. Peratus COD(bi) terbiodegradasi (24%), COD(ubi) tidak terbiodegradasi (76%), COD(s) terlarut (59%), COD(bsi) terbiodegradasi boleh larut (38%), COD(ubsi) tidak terbiodegradasi boleh larut (62%) dan zarah COD (PCOD) (41%) di dalam larut xxii lesapan stabil turut dikaji. Peratus COD(bi) telah meningkat kepada 28%, 36% dan 30% setelah O3, O3/H2O2/Fe2+ dan O3/S2O8 2- digunakan. Manakala, COD(S) meningkat kepada 59% selepas penggunaan O3 dan 72% setelah kedua-dua AOPs berasaskan ozon dimasukkan. Peratus COD(bsi) juga turut meningkat kepada masing-masing 38%, 51% dan 55% selepas O3, O3/H2O2/Fe2+ dan O3/S2O8 2- digunakan. Manakala peratus PCOD telah berkurangan daripada 41% kepada 35% selepas penggunaan O3 dan 28% selepas kedua-dua AOPs berasaskan ozon dimasukkan. Memandangkan keberkesanan O3 dalam proses olahan larut lesapan stabil adalah lemah, maka disarankan agar ozon hanya digunakan sebagai proses pra atau pasca olahan. Ozon/Fenton lebih cekap dalam penyingkiran COD dan warna, manakala, Ozone/persulfat merupakan kaedah berkesan untuk mempertingkatkan biodegradasi. Selain itu, proses ozone/persulfat adalah lebih berkesan dalam menyingkirkan ammonia di samping juga berkesan dalam penyingkiran COD dan warna daripada larut lesapan stabil. Data yang sesuai dalam pemajuan loji olahan larut lesapan stabil menggunakan Ozon/persulfat juga dicadangkan. Efluen akhir proses Ozon/Fenton mematuhi tahap pelepasan standard untuk COD dan warna, manakala Ozon/persulfat merupakan kaedahyang berkesan dalam meningkatkan kebolehrosotan organik.
Özet (Çeviri)
Leachate pollution is one of the main problems in landfilling. Among the most problematic parameters in stabilized leachate are COD, ammonia, and color. The treatment technology that can be used may differ based on the type of leachate produced. Even after treatment, the effluent characteristics are always hard to comply with the discharge standard. Ozonation is one of the chemical processes that can be used in the treatment of landfill leachate. However, its performance when use alone is low; its effectiveness can be improved using advanced oxidants. To date, application of Fenton and persulfate reagents separately to improve ozonation process in one ozone reactor was not well established. The study aimed to evaluate and compare the performance of the three treatment processes, namely ozone, ozone/Fenton and ozone/persulfate in treating stabilized leachate separately at different experimental conditions. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables. Based on statistical analysis, quadratic models for the four responses (COD, NH3–N, Color, and ozone consumption (OC)) proved to be significant with very low probability values (<0.0001). For the three optimization designs; the predicted results fitted well with the results of the laboratory experiment. This study also investigated the effects of the three treatment processes on the biodegradable and soluble characteristics of stabilized leachate. The biodegradability (BOD5/COD ratio) in stabilized leachate was 0.034, and it's improved to 0.05, 0.14 and 0.29 by applying O3, O3/fenton and O3/persulfate, respectively. Fractions of biodegradable COD(bi) (24%), non-biodegradable COD(ubi) (76%), soluble COD(s) (59%), biodegradable soluble COD(bsi) (38%), non-biodegradable soluble COD(ubsi) (62%), and particulate COD (PCOD) (41%) in stabilized leachate were also investigated. The fraction of COD(bi) increased to 28, 36 and 30% after applying O3, O3/H2O2/Fe+2 and O3/S2O8 2- , respectively. COD(S) increased to 59% after O3, 72% after both ozone-based AOPs. COD (bsi) increased to 38, 51 and 55% after O3, O3/H2O2/Fe+2 and O3/S2O8 2- , respectively, whereas the PCOD reduced from 41 to 35 xxiv after O3 and 28% after both ozone-based AOPs. Accordingly, the performance of O3 in stabilized leachate treatment is poor and suggests utilizing as pre or posting treatment process. Ozone/fenton process has higher performance in COD and color removal, while, ozone/persulfate is an efficient method for enhanced biodegradability. Furthermore, ozone/persulfate process has higher performance in ammonia removal as well as it has good removal efficiency of COD and color from stabilized leachate. Suitable data for establishing fully stabilized leachate treatment plant using ozone/Fenton and ozone/persulfate was suggested. The final effluent of ozone/Fenton process complied with the discharge standard for COD and colour, while ozone/persulfate is an efficient method for enhancing the biodegradability of organics
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