Plant assays and avoidance tests with collembola and earthworms demonstrate rehabilitation success in bauxite residue

“Red mud” or “bauxite residue” is a highly alkaline waste generated from alumina refinery with a pH of 10.5–12.5 which poses serious environmental problems. Neutralization or its treatment by sintering in presence of additives is one of the methods for overcoming the caustic problem as it fixes nearly all the leachable free caustic soda present in red mud. In the present study, feasibility of reducing the alkaline nature of red mud by sintering using fly ash as an additive via Taguchi methodology and its use for brick production, as an alternative to clay, is investigated. The analysis of variance (ANOVA) shows that sintering temperature is the most significant parameter in the process. A pH of 8.9 was obtained at 25–50% of red mud and 50–75% fly ash with water and temperature of . Alternatively 50% of red mud can be mixed with 50% of fly ash with water at temperature of to get a pH of about 8.4. The mechanism of this process has been explained with also emphasis on chemical, mineralogical, and morphological analysis of the sintered red mud. The results would be extremely useful in utilization of red mud in building and construction industry.

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Co-solidification of bauxite residue and coal ash into indurated monolith via ambient geopolymerisation for in situ environmental application

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.126925 ◽

2022 ◽

Vol 422 ◽

pp. 126925

Author(s):

Tuan A.H. Nguyen ◽

Xingyun Guo ◽

Fang You ◽

Narottam Saha ◽

Songlin Wu ◽

...

Keyword(s):

Bauxite Residue ◽

Coal Ash ◽

Environmental Application

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Cognitive-Enhancing Effect ofAronia melanocarpaExtract against Memory Impairment Induced by Scopolamine in Mice

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2016/6145926 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Hyeon Yong Lee ◽

Jin Bae Weon ◽

Youn Sik Jung ◽

Nam Young Kim ◽

Myong Ki Kim ◽

...

Keyword(s):

Passive Avoidance ◽

Learning And Memory ◽

Morris Water Maze ◽

Water Maze ◽

Memory Impairment ◽

Ache Activity ◽

Antioxidant Effect ◽

Enhancing Effect ◽

Aronia Melanocarpa ◽

Avoidance Tests

Aronia melanocarpa(A. melanocarpa)berriesare a fruit with a marked antioxidant effect. The objective of this study was to confirm the effect ofA. melanocarpa berriesextract against scopolamine-induced memory impairment in mice using the Morris water maze and passive avoidance test. Moreover, we determined a possible mechanism of the cognitive-enhancing effect involving AChE activity and BDNF and p-CREB expression in the hippocampus of mice.A. melanocarpa berriesextract attenuated the learning and memory impairment induced by scopolamine in the Morris water maze (79.3 ± 0.8 s of 200 mg/kg and 64.4 ± 10.7 s of 400 mg/kg on day 4) and passive avoidance tests (46.0 ± 41.1 s of 200 mg/kg and 25.6 ± 18.7 s of 400 mg/kg).A. melanocarpa berriesextract reduced the acetylcholinesterase level in the hippocampus of scopolamine-injected mice and increased BDNF and p-CREB expression in the hippocampus. The major compound, cyanidin-3-O-galactoside, also reversed memory impairment. These results showed thatA. melanocarpa berriesextract improved memory impairment by inhibiting AChE and increasing BDNF and p-CREB expression, and cyanidin-3-O-galactoside may be responsible for the effect ofA. melanocarpa berriesextract.

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