Reduction of phosphorus release from high phosphorus soil by red mud

Abstract

The high phosphorus levels cause the release of phosphorus from soils, thereby increasing the potential for phosphorus export to adjacent water bodies. The loss of phosphorus from soils to surface waters is a major source of water quality impairment. Therefore, soil phosphorus immobilization seems necessary. In this study, red mud (RM) was employed to immobilize phosphorus in a typical agricultural soil. It was found that phosphorus was effectively immobilized by RM. Batch leaching experiments showed that RM reduced phosphorus release from 14.38 to 2.56 mg/kg when soil was amended with 1% RM. Column leaching experiments showed that RM reduced the total amount of phosphorus released from 36.73 to 18.79 mg/kg during the investigated period. Sequential chemical extraction results indicated that RM amendment transformed H 2 O-P into more stable fractions. The results suggested that application of RM amendment to soils could significantly immobilize soluble phosphorus, reducing phosphorus release to the environment.

The use of red mud as an immobiliser for metal/metalloid-contaminated soil: A review

“…The abundance of red mud has led to extensive research into possible uses [12]. These include: recovery of Al, Fe, and rare earth metals [29,30]; a sorbent for treatment of contaminated water [31,32]; sequestration of CO2 [33]; an additive to ceramics and building materials [34,35]; embankment construction [36]; and soil amendment [2,12,14,17,[37][38][39][40][41][42]. All of these uses may play a role in reducing the storage of red mud.…”

Soil Bacteria and Fungi Respond Differently to Organisms Covering on Leshan Giant Buddha Body

“…The digestion solution with methyl red-bromocresol green indicator and boric acid solution (20 g•L −1 ) was titrated with hydrochloric acid standard solution (0.0100 mol•L −1 ) after distilling by Kjeldahl nitrogen analyzer (KND, Top Ltd., Hangzhou, Zhejiang, China), and soil TN content was then calculated based on hydrochloric acid consumption. TP was analyzed colorimetrically after the digestion with H 2 SO 4 and HClO 4 [31].…”

Conceptual design and cost analysis of a large‐scale plant for converting red mud into building materials

“…Useful technologies that make extensive use of RM to establish a sustainable supply chain for the circular economy could be the key to resolving these issues. RM has already been proposed as a component in the production of several items used in the construction sector 7 , such as tiles, 8 cement, 9 bricks, 10 aggregates for concrete and roads, 5 road sublayers, bituminous mixtures, 11 or environmental application such as catalysts and adsorbents for wastewater treatment, [12][13][14][15][16] and CO 2 sequestration, 17 among others.…”