scholarly journals Metal Sulfide Precipitation: Recent Breakthroughs and Future Outlooks

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1385
Author(s):  
Humberto Estay ◽  
Lorena Barros ◽  
Elizabeth Troncoso

The interest in metal sulfide precipitation has recently increased given its capacity to efficiently recover several metals and metalloids from different aqueous sources, including wastewaters and hydrometallurgical solutions. This article reviews recent studies about metal sulfide precipitation, considering that the most relevant review article on the topic was published in 2010. Thus, our review emphasizes and focuses on the overall process and its main unit operations. This study follows the flow diagram definition, discussing the recent progress in the application of this process on different aqueous matrices to recover/remove diverse metals/metalloids from them, in addition to kinetic reaction and reactor types, different sulfide sources, precipitate behavior, improvements in solid–liquid separation, and future perspectives. The features included in this review are: operational conditions in terms of pH and Eh to perform a selective recovery of different metals contained in an aqueous source, the aggregation/colloidal behavior of precipitates, new materials for controlling sulfide release, and novel solid–liquid separation processes based on membrane filtration. It is therefore relevant that the direct production of nanoparticles (Nps) from this method could potentially become a future research approach with important implications on unit operations, which could possibly expand to several applications.

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1583-1590 ◽  
Author(s):  
Y. Magara ◽  
M. Itoh

One third of the total population of Japan is served by collected human excreta treatment systems for the sanitary treatment of human wastes. In order to cope with the stringent effluent quality regulations set for human excreta treatment plants, the high-load biological denitrification process with ultra-membrane filtration for solid/liquid separation has been recently developed. This system has big advantages not only with respect to the solid/liquid separation stage of biological treatment processes, but also as regards the cost and operational effectiveness of advanced treatment processes such as ozonation and activated carbon adsorption. However, problems can be experienced with the ultra-membrane filtration process because the attainable hydraulic load is completely governed by the permeation flux. Therefore, in order to utilized the ultra-membrane filtration process in a biological wastewater treatment system, the effects of the operational factors on the permeation flux have to be clarified. In this paper, the effects of factors such as water temperature, suspended solids concentration, driving pressure, and water velocity in the unit are described. It has become clear that in order to attain a stable permeation flux, the water temperature and suspended solids concentration should be kept as stable as possible. The results of the investigation of the development of cake or gel layer resistance showed that high pressure and high velocity give a high and stable permeation flux. However, it has also been shown that the optimum operational conditions are high pressure and low velocity, due to the energy costs for operation of the system.


Author(s):  
Zhaoliang Wu ◽  
Yuqiang Ji ◽  
Yanan Guo ◽  
Junna Hu

Solid-liquid separation is an important step for the separation of nisin from the fermentation broth. This paper studied the application of ceramic membrane filtration to remove the solid. Experimental results indicated that the solid removal ratio was above 99% at pH 2.5, 40-50 °C, 0.1 Mpa, recovery of nisin being 84.4%, and while at pH 2.5 HCl was added to dilute the residue in the later stage. Compared to the recovery without the diluted residue, the yield increased 17.4%.


2021 ◽  
Vol 164 ◽  
pp. 106825
Author(s):  
Xiaoyu Tang ◽  
Shihao He ◽  
Facheng Qiu ◽  
Xianfeng Qin ◽  
Xuejun Quan ◽  
...  

2017 ◽  
Author(s):  
Joshua Tyler Brown ◽  
Teng Teeh Lim ◽  
Joseph Zulovich ◽  
Christine Costello

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