Pencernaan anaerobik merupakan salah satu keadah efektif untuk mendegradasi buangan organik supaya gas metana dapat dihasilkan and jadikan ia sebagai bahan api atau sumber tenaga. Kegiatan untuk jenis mikroorganisma tertentu contohnya spesies Spesies Methanosarcina dan spesies Methanoseata adalah factor utama yang mendorong penghasilan gas mentana sepanjang proses pencernaan anaerobik. Prestasi Sistem Reaktor Sesekat Anaerobik dengan isapadunya sebanyak 35L yang digunakan untuk merawat air sisa kilang pembuatan kertas guna semula telah dikaji dengan mengubahsuai suhunya antara (28oC, 37oC, 55oC) setelah mencapai keadaan mantap dengan masa tahanan hidrolik yang tetap iaitu 2 hari. Jenis mikroorganisma dan penghasilan gas mentana telah ditentukan. Sifat bagi air sisa kertas guna semula seperti pH, kadar penyingkiran COD, dan asid lemak meruap (VFA)/alkali digunakan turut dikajikan. Kajian menunjukkan antara tiga suhu yang dipelajari, penyingkiran maksimum COD ialah 96.54% telah dicapai pada 37oC suhu walaupun penghasilan gas mentana tertinggi telah diukur pada 55oC. Gambar SEM menunjukkan bahawa bagi fasa keasikan, bakteria yang mampu hidup bawah tahap substrat yang tinggi and pH rendah mendominasi di depan ruangan reaktor and seterusnya alih kepada bakteria berkemampuan hidup bawah pH tinggi menumpu di belakang reaktor. Di samping itu, pencernaan anaerobik telah dianalisa dan dimodel dengan menggunakan Modified Gompertz Equation dan Generalized Equation of Contois and Monod model untuk menguji kesan perubahan suhu bagi performansi reaktor.
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Anaerobic digestion process is one of the alternative methods to degrade organic waste into methane gas that can be well utilised as a fuel or energy source. Activities of various kinds of microorganisms are the main factor for anaerobic digestion which produces methane gas, for example Methanosarcina sp. and Methanoseata sp. Therefore, in this study, continuous anaerobic treatment technology has been developed in a modified Anaerobic Baffled Reactor (MABR) and process parameter such as temperature was optimized. A MABR with working volume of 35 litres was designed to evaluate the performance of bioreactor at steady state condition under different temperature range (28oC, 37oC, 55oC) with same hydraulic retention time of 2 days by identifying the microorganisms and measuring biogas (methane) production. Physico-chemical characteristics of recycled paper mills effluent (RPME) and sludge such as COD, pH, and VFA are being studied as well. Scanning electron micrograph (SEM) results show that in the acidification zone of the MABR (front compartments of reactor) fast growing bacteria capable of growing at high substrate levels and reduced pH was dominant. A shift to slower growing scavenging bacteria that grow better at higher pH was occurring towards the end of the reactor. Highest COD removal of 96.54% is achieved at 37oC although methane gas production is found to be highest under temperature range of 55oC. Two kinetic models such as Modified Gompertz Equation and Generalized Equation of Contois and Monod Model are also applied for a better understanding of the influence of temperature changes on performance of these systems.
Kinetics and characterization of recycled paper mills effluent using modified anaerobic baffled reactor / Ting Mei Shiek