Natural flocculant from Durio zibethinus seed starch for municipal solid waste landfill leachate treatment

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dc.contributor.authorMohd Faiz Muaz Ahmad Zamri
dc.date.accessioned2021-04-15T02:59:50Z
dc.date.available2021-04-15T02:59:50Z
dc.date.issued2016-09-01
dc.description.abstractThe used of polyaluminium chloride (PAC) coagulant is prominent in landfill leachate treatment. PAC coagulant is proven to be among the effective coagulants for landfill leachate treatment. However, it was found that PAC coagulant has a toxic potential of aluminium residual to the aquatic environment. As an alternative, the combination of natural flocculants with inorganic coagulants could reduce the dosage and dependence on the PAC coagulant and improved the flocculant properties. In this study, natural based flocculants from durian seed starch were used for landfill leachate treatment. The landfill leachate samples were collected from Matang landfill located at Taiping, Perak. The durian seed starches were extracted using dry milling and wet milling extraction method. The best starch obtained was further modified by crosslinking modification method to improve the treatment process. The experimental condition in removing colour, Chemical Oxygen Demand (COD), suspended solid and turbidity were further optimized statistically using Response Surface Method (RSM). The settling velocity values were compared and used for mixing and settling tanks calculation design. According to the results, the use of wet milling durian seed starch (WM-DSS) as a flocculants increased the removal percentage of colour, suspended solids and turbidity by 0.4 %, 2.9 %, and 13.2 % compared to PAC coagulants alone (88.8%, 90.7 % and 80.5 %). Besides, the sludge velocity index (SVI) was also improved from 531.3 mL/g to 158.1 mL/g. In contrast, the use of dry milling durian seed starch (DM-DSS) flocculants had decreased the removal percentage of chemical oxygen demand (COD), suspended solids and turbidity by 25 %, 1.6 %, and 2.8 % compared to PAC coagulants alone (59.6 % 97.2 xxi % and 95.0 %). In this respect, wet milling extraction method was effective to be used for starch flocculants synthesis. In fact, the crosslinking modification of the wet milling starch flocculants (CWM-DSS) further increased the removal percentage of colour, chemical oxygen demand (COD), suspended solids and turbidity by 1.7 %, 5.1 %, 14.8 %, and 14 % compared to PAC alone (94.4 %, 55.8 %, 70.4 % and 81.1 %). Moreover, this starch modification had able to reduce 0.557 g/L concentration of PAC coagulant for landfill leachate treatment. Besides, the used of CWM-DSS flocculants able to reduce the number of settling tank from 6 to 3 units and increased the volume of treated leachate from 2376 m3/day to 2404.08 m3/day. Therefore, it was clearly observed that the used of CWM-DSS flocculants is effective to be used for landfill leachate treatment process.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/12844
dc.language.isoenen_US
dc.titleNatural flocculant from Durio zibethinus seed starch for municipal solid waste landfill leachate treatmenten_US
dc.typeThesisen_US
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