Sanitary Landfill leachate treatment with Moringa Oleifera seed extract and micro-filtration membrane

摘要

A laboratory based study using a bench scale model of four unit operations made up of coagulation (using Moringa oleifera seed extract as a coagulant), flocculation-sedimentation and micro-filtration, have been adopted to treat the leachate from Air Hitam Sanitary Landfill at Puchong in Malaysia. Moringa oleifera dosages of 150 and 175 mg/l had achieved 43.8% Cadmium removal, 21.2% Total Chromium removal, 66.8% Lead removal, and 16% Iron removal. 55.4% of Total Suspended Solids, 10 % of Total Dissolved Solids, and 24.2% of Volatile Suspended Solids. Micro-filtration hollow fibre membrane decreased the turbidity, total suspended solids, total dissolved solids, volatile suspended solids, and organic matter in the leachate by 98.3 %, 96.7 %, 20.8 %, 36.6%, and 21.9% respectively. Overall heavy metals removal after micro-filtration using hollow fibre membrane was 94% for Cadmium, 29.8% for Total Chromium, 73.2 % for Lead, and 18.3% for Iron. The results have shown that Moringa oleifera in combination with micro filtration have potential for removing heavy metals from the leachate and may be used as a pre-treatment stage for biological treatment to eliminate a portion of the toxic heavy metals, which limit the activity of microorganisms in the leachate.