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Human health may be at risk when consuming edible but metal-contaminated aquatic plants. This present study was conducted to evaluate the bioavailabilities of manganese (Mn) and cadmium (Cd) in metalscontaminated wild water spinach (WWS), Ipomoea aquatic Forssk. through in vitro human gastrointestinal digestions. Additionally, the health risks from consuming the plant were also assessed. Metals-contaminated hydroponic nutrient solutions were used to grow the plants under greenhouse conditions. The plants were harvested after seven days of metal exposure and their edible shoots (stems and leaves) underwent digestions simulated from the human gastrointestinal tract. A standard reference material (peach leaves, SRM 1547) was used to assess the precision and accuracy of the in vitro digestion studies. Results showed that the metal concentrations in plants increased when the treatment concentration increased; the metals concentrations were higher in the raw (RHS) samples than in the cooked (DHS and CHS) samples. The bioavailabilities of Mn and Cd were found to be higher in the intestinal extractions than in the gastric extractions. The health risk index (HRI) showed that the adults averagely aged 44 in Selangor, Malaysia was at risk if they consumed Mn-T1-contaminated cooked (CHS) WWS and Cd-contaminated raw (RHS) and cooked (CHS) WWS at T1 and T2 because their HRI values were more than 1.
This paper describes a batch study on four different mixture ratios of household organic waste and cow manure. The biomethane potential test is used to evaluate the suitability of high solid anaerobic co-digestion of household organic waste and cow manure and its biodegradability. The maximum methane yield was observed for both co-digestions in R3 (247 mL/g VS) and R4 (244 mL/g VS). The percentages of mass recovery were 65-80% (based on VS removal). The biodegradability of each reactor was recorded as 97.7%, 10.7%,71.6% and 76.8% for R1, R2, R3, and R4, respectively. High solid co-digestion of household organic waste and cow manure in different mixture ratios increase the specific methane yields compared to mono-digestion. Hence, this clearly demonstrates a synergistic effect on the stability of anaerobic digestion. Upon correcting the results of the theoretical method with experimental data, an agreement ranged 70-90% was achieved.
The accumulation of organic fraction in municipal solid waste (OFMSW) is now becoming scarce globally due to population and economic boosts, especially in Malaysia. Municipal solid waste (MSW) landfills remain the predominant end-state for waste disposal in most developing countries. Unsustainable MSW management accelerates environmental degradation through landfill gaseous (LFG) emissions of mainly methane (CH₄) and carbon dioxide (CO₂), which promote global warming that finally is affecting human health. Recently, harnessing CH₄ from anaerobic digestion of solid waste has attracted more interest and promised betterment in MSW management. With its current amount of more than 50%, organic material in landfills is estimated to emit 310,225 CH₄/year with carbon credit of US$ 85.93, which can potentially generate 2.20×109 kWh of electricity valued at US$ 220 million. This present work is a review manuscript that discusses the state-of-the-art anaerobic digestion of OFMSW as treatment in term of waste diversion from a landfill. The study also estimates the renewable energy potentials from OFMSW waste diversion. Finally, this paper discusses the benefits of harnessing biogas from the perspectives of environmental benefits, energy recovery, and economics.
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