The highly acid sulfate Rangsit soil series of Rangsit, Pathum-Thani district, Thailand poses a major problem for agriculture in the area. Water hyacinth is a naturally occurring weed that can grow aggressively, causing eutrophication and leading to many severe environmental impacts. Here, through the pyrolysis process, we convert water hyacinth to biochar and use it for acid soil amendment. We found the ratio between biochar, soil, and sand suitable for the cultivation of water convolvulus to be 50 g of biochar, 400 g of soil, and 100 g of sand (1:8:2). This soil mixture improved the pH of the soil from 4.73 to 7.57. The plant height of the water convolvulus grown in the soil mixture was the greatest at 20.45 cm and the plant weight with and without roots was greatest at 2.23 g and 2.52 g, respectively. Moreover, we demonstrated the dominance and high abundance of Bacillus among the community in soil with biochar amendment. Here we provide the first assessment of the appropriate amount of water hyacinth-derived biochar for mitigation of soil acidity and promotion of optimal water convolvulus growth. Moreover, biochar can optimally modify soil bacterial communities that benefit plant development.
Abstract. In this paper, we investigated on simultaneous electric energy production and organic matter was removed from synthetic wastewater by Microbial Fuel Cells (MFCs). Single chamber MFCs was made up by Haplusterts great group soil (Samo -Thod soil group) in trial design 3 x 3 factorial design in Completely Randomize Design (CRD) which 3 levels synthetic wastewater; 0, 200 and 400 mg/l of glucose and 3 levels of flooding time: 1, 3 and 5 days. The results showed the interaction significant with decreasing sugar from synthesis wastewater and Open Circuit Voltage (OCV). The maximum OCV of 200 and 400 mg/l of glucose in 3 flooding days were 131 and 142 mV and decreasing to 110 and 126 mV in 5 flooding days, respectively. The highest percent of decreased glucose approached to 80% in 5 flooding days of 0.4 g/l of glucose. The findings suggested that not only MFCs were a significantly to reduce organic matter in wastewater but also generated electric energy in the same time.
Effective food waste management is key to a sustainable future. We herein aimed at assessing the composition and the amount of food waste generated in the Chamchuri (CU) Terrace condominium (floors 18–22) in Bangkok (Thailand), producing soil amendment material from this same food waste and examining the effect of bioplastic bags on composting. The condominium generated 29.01 kg of general waste per day. The food waste (6.26 kg/day) was classified into “available” and “unavailable” food waste, accounting for 3.26 and 3.00 kg/day, respectively. The composting of the food waste lasted 45 days and was undertaken under three experimental conditions: (i) control (no food waste), treatment 1 (T1: food waste), and treatment 2 (T2: food waste along with pieces of bioplastic bags). The physicochemical analysis of the final composts of these treatments revealed that T2 could be used as soil amendment material after enrichment of its macronutrient composition and an increase in fermentation time. Interestingly, the T2 bioplastics were characterized by a lack of holes or were fragmented into pieces larger than 5 mm. In conclusion, food waste management in the CU Terrace condominium can use food waste collected in bioplastic bags as soil amendment material.
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