Abstract
As a low-cost adsorbent, biochar can be used as a great tool for water treatment. Instead of using expensive woody biomass for biochar production, this study aimed to investigate the feasibility of using biowaste such as sugarcane skins, orange peels, and peanut shells to produce biochars through pyrolysis at 700°C. The optimal time length, dosage, and temperature for water purification were explored afterwards in batch tests. The ammonia nitrogen (NH4+-N) removal efficiencies of sugarcane skin, orange peel, and peanut shells were 74.4%, 96.3% and 90.8%, respectively, and the simultaneous permanganate index removal efficiencies were 26.6%, 31.0% and 26.6%, respectively. There was no significant difference in NH4+-N and permanganate index removal efficiencies when the dosage of three kinds of biochars was higher than 1.0 g/100 ml water. Greater adsorption capacity of biochars was observed for pollutants when temperature was increased from 10 to 30°C. These results confirmed our assumption that biowaste could make for good raw materials in producing biochars.
Highlights
The tremendously fast growth of the urban populations and the expansion of urban construction in China, along with the discharge of sewage and waste into river waters, have deteriorated Chinese river water quality, which has posed increasing risks to aquatic ecosystems
To determine the optimal water treatment duration using biochars made from sugarcane rind, orange peel and peanut shells, samples were collected on an hourly basis during the 9-h test
As seen in figure 3, the organic matter and NH4+-N removal efficiencies by the biochars made of orange peel were greater than that by the biochars made of sugarcane rind and peanut shells
Summary
The tremendously fast growth of the urban populations and the expansion of urban construction in China, along with the discharge of sewage and waste into river waters, have deteriorated Chinese river water quality, which has posed increasing risks to aquatic ecosystems. Compared with expensive activated carbon, biochar prepared by biomass has a greater surface area due to its high porosity, which make it a low-cost and high-efficiency adsorbent for water treatment (Kumar et al, 2010; Pajooheshfar et al, 2009). Low-cost materials for biochar production need to be explored. Converting biowaste into biochar has the potential to eliminate the amount of pollutants in water bodies, and to solve the problem of the household waste disposal. Some biowaste consists largely of stabile carboniferous substance which can serve as promising raw materials for biochar production. This study aimed to investigate the potential production of biochars through pyrogenic decomposition by using sugarcane skin, orange peels, and peanut shells as biomass materials. We investigated the removal of water- pollutants using the biowaste derived biochars produced
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