Rawatan larut resap kambus tanah memerlukan beberapa tahap rawatan dan proses elektro-penggumpalan (EC) berpotensi untuk melengkapi unit rawatan yang utama seperti membran dan rawatan biologi. Justeru itu, EC dicadangkan dalam kajian ini untuk mengatasi sesetengah masalah yang berkaitan dengan rawatan konvensional. Rawatan larut resap kambus diambil dari Tapak Pelupusan Sampah Pulau Burung. Dalam kajian ini pemboleh ubah dari EC prosess dioptimumkan seperti ketumpatan electrik, masa EC, dan jenis elektrode. Di samping itu, penyingkiran Cu dan As juga dikaji disebabkan logam berat tersebut belum dikaji oleh pengkaji lain. Keberkesanan proses EC ditentukan oleh peratusan penyingkiran keperluan oksigen kimia (COD), jumlah pepejal terapai dan kekeruhan. Penambahan polyacrylamide (cPAM) kationik sebagai pembantu penggumpalan juga dikaji untuk meningkatkan prestasi proses. Hasil daripada eksperiment itu di optimumkan lagi menggunakan kaedah statistik sambutan balas permukaan (RSM). Berdasarkan pada hasil eksperimen, penggunaan (cPAM) meningkatkan keberkesanan penyingkiran efisiensi sebanyak (6%, 28% dan 20%) COD, jumlah pepejal terapai dan kekeruhan masing- masing berbanding dengan EC sahaja (39 %, 43% dan 68 %). Seterusnya, taburan saiz zarah juga menunjukkan bahawa cPAM mempunyai saiz zarah yang lebih besar (56.85μm) berbanding dengan EC sahaja (25.39μm). Penyingkiran jumlah karbon organic (TOC) juga dikaji dan hasil kajian menunjukkan bahawa penambahan cPAM mengurangkan TOC sebanyak 44 mg/l berbanding dengan penggunaan EC sahaja (26 mg/l). Hasil kajian juga menunjukkan bahawa, prestasi EC proses meningkat dengan penambahan cPAM. Jadi, cPAM menambahbaikkan proses penggabungan, peneutralan cas dan penggumpalan agen penggumpal dengan bahan pencemar. Sebagai kesimpulannya, EC sesuai untuk digunakan sebagai unit rawatan awal bagi larut resap.
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Since leachate treatment requires multiple stages of treatment, electrocoagulation (EC) is proposed as a pretreatment unit to compliment the main unit operations treatment such as membrane or biological treatment. EC was proposed in this study to overcome some of the problems with conventional treatments. The landfill leachate sample was collected from Pulau Burung Sanitary Landfill. In this study, variables of the EC process such as current density, EC time and types of electrode were optimized. Besides that, Cu and As removals also been studied since these heavy metals was hardly investigated by others researchers. The process efficiency of the EC was determined by percentage removal of chemical oxygen demand (COD), total suspended solids (TSS) and turbidity. The addition of cationic polyacrylamide (cPAM) as a coagulant aid was also studied in order to increase the efficiency of the treatment process. The results were further optimized using Response Surface Method (RSM).According to the results also, the use of cPAM increased the removal efficiency by (6%, 28% and 20%) COD, TSS and turbidity respectively compared to those of EC alone (39 %, 43% and 68%). Next, the particle sizes distribution also showned that cPAM had larger sizes (56.85μm) compared to EC alone (25.39μm). Total organic carbon (TOC) was also studied and the results showed that cPAM addition reduced the TOC by (44 mg/l) compared to EC alone (26 mg/l). Based on the results, EC was improved by the addition of cPAM. This was because cPAM improved the bridging, charge neutralization and agglomeration of coagulant agents with the pollutants. As a conclusion, EC was suitable as a pretreatment unit for leachate treatment.
Process performance of electrocoagulation in treating sanitary landfill leachate as pretreatment unit / Helmi Amanullah