The effect of different concentration of composite coagulant on different arrangement of electrodes for hybrid composite coagulation and lector coagulation treatment of landfill leachate

• Main Author: Mohd Amdan, Nur Syahirah
• Format: Thesis
• Language: English; English; English
• Published: 2021
• Subjects: T Technology (General); TA401-492 Materials of engineering and construction. Mechanics of materials
• Online Access: http://eprints.uthm.edu.my/6447/1/24p%20NUR%20SYAHIRAH%20MOHD%20AMDAN.pdf; http://eprints.uthm.edu.my/6447/2/NUR%20SYAHIRAH%20MOHD%20AMDAN%20COPYRIGHT%20DECLARATION.pdf; http://eprints.uthm.edu.my/6447/3/NUR%20SYAHIRAH%20MOHD%20AMDAN%20WATERMARK.pdf; http://eprints.uthm.edu.my/6447/

The development and the population of the country cause the increment of solid waste generation. When the solid waste is increasing, leachate production also increases. The drawback is the potential of leachate to seep into the ground soil that able to contaminate the surrounding area. In this study, the combined treatment of electrocoagulation and conventional coagulation was used to treat landfill leachate. The leachate sample was collected from Simpang Renggam Landfill. The electrodes used in this experiment were Iron (Fe) and Aluminium (Al) electrodes. The electrode was dipped into the beaker with a leachate sample (1000mL) and connected to the direct current power supply. The dimension of the electrode used was 200 mm x 50 mm x 1 mm. The main objective of this study was to determine the optimum ratio of composite coagulant used with the best electrode arrangement to treat the stabilised leachate under the influence of pH, current density, dose of coagulant, and duration of current flow. Three ratios of the composite were used PACTSa, PACTSb, and PACTSc. PACTSb. was the optimum ratio of composite coagulant with the arrangement of AlAl electrodes. The optimum conditions took place at pH 6, current density of 50 A/m , 0.3 g/L, and at 22 minutes of treatment time. The concentration of PAC and TS in PACTSb was 80 g/L and 30 g/L, respectively. The obtained removal at these optimum conditions for turbidity, colour, SS, COD, and ammonia nitrogen was 90%, 97%, 100%, 60%, and 15%, respectively. The sludge of the optimum condition was evaluated by sludge volume index (SVI), sludge settling rate (SSR), scanning electron microscopy (SEM) and particle size analyser (PSA). Based on the SVI result, the sludge settled very slowly and compacted poorly. The value of SVI for each electrode around 245 mL/g – 373 mL/g. The sludge settling rate shows that Fe ion settle faster compared to Al ion due to Fe ion is heavier. Through the SEM image, the surface of sludge from combined treatment was more compact compared to other methods. Besides, based on the sludge size, it showed the sludge was fine, compacted, and smooth, which indicated a good removal. Therefore, the combined treatment was effective to treat the stabilised leachate.