Review of Chromium Residue and Chromium-containing Waste Water Treatment

Abstract

Abstract. In August 2011, chrome pollution incident happened in Qujing County, Yunnan, China, which caused the attention of the people all over the world. In this paper, the chrome hazards for the health, the routines of chromium residue and Cr-containing wastewater treatment process and the newest research progress--biological materials adsorption method, biological degradation and urban sludge treatment method were reviewed. Finally, the innovative processing method, "reducing barriers" thoughts were introduced.

Separation of lattice-incorporated Cr(vi) from calcium carbonate by converting microcrystals into nanocrystals via the carbonation pathway based on the density functional theory study of incorporation energy

“…It is often found in the waste residues generated from smelting and wastewater treatment processes, such as chlorate industrial sludge, chromite ore process residue and electroplating sludge. [8][9][10] CaCO 3 exhibits three types of crystalline polymorphism (calcite, aragonite and vaterite), with previous crystallographic studies reporting that carbonate (CO 3 2−…”

“…It is often found in the waste residues generated from smelting and wastewater treatment processes, such as chlorate industrial sludge, chromite ore process residue and electroplating sludge. 8–10 CaCO 3 exhibits three types of crystalline polymorphism (calcite, aragonite and vaterite), with previous crystallographic studies reporting that carbonate (CO 3 2− ) in CaCO 3 can be easily substituted with foreign ions during the crystallization process. For instance, CrO 4 2− can replace CO 3 2− in the CaCO 3 lattice during co-precipitation, forming polymorphs of calcite and vaterite.…”

The impact of chromium ion stress on plant growth, developmental physiology, and molecular regulation

“…The situation of chromium pollution is not optimistic and ~15% of products in the national economy are related to chromium salts. Each ton of chrome salt products emits more than 2.5 tons of chrome slag, and Na 2 CrO 4 and CaCrO 4 in chrome slag are the main components that pollute the environment (Chapman, 2012 ; Liu et al, 2016 ; Zhang et al, 2017 ). Currently, more than 20 million hm 2 of cultivated land in China is contaminated by heavy metals such as chromium (Batley, 2012 ; Zhucheng and Lin, 2020 ).…”