Leiviskä, T., Khalid, M., Gogoi, H., Tanskanen, J. (2018) Enhancing peat metal sorption and settling characteristics. Ecotoxicology and Environmental Safety, 148, 346-351. doi:10.1016/j.ecoenv.2017.10.053
Enhancing peat metal sorption and settling characteristics
|Author:||Leiviskä, Tiina1; Khalid, Muhammad Kamran1; Gogoi, Harshita1;|
1University of Oulu, Chemical Process Engineering
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe201901101827
|Publish Date:|| 2019-11-06
Peat is an excellent material for metal sorption since it naturally contains different kinds of functional groups that can sorb metal cations from water. The main objective of this work was to test low-cost treatment (acid and alkali) methods for natural peat, which would improve the settling properties of peat particles while maintaining its metal removal efficiency. Particularly, the poor settling properties of peat hinder its practical application. The study revealed that NaOH-treated peat (0.1 M) had excellent settling properties and could be applied in wastewater applications having mixing and settling systems without a settling aid. The superior leaching of humic and fulvic acids in alkaline treatment caused a change in morphology, making it a harder and sticky material. Moreover, the NaOH-treated (0.1 M) peat was proven to be the most efficient material for nickel removal followed by the HCl-treated (0.2 M) peat, citric acid-treated (0.16 M) peat and water-treated peat. A higher temperature and longer time slightly increased the Ni removal efficiency with NaOH-treated peat material. The settling of HCl-treated peat was studied further using polyacrylamide flocculants (cationic, neutral, anionic). Cationic flocculants performed best and the cationic charge density also had an effect on the flocculation performance of peat particles. This study provides further evidence that peat can be applied in the treatment of metal-containing wastewaters.
Ecotoxicology and environmental safety
|Pages:||346 - 351|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
218 Environmental engineering
116 Chemical sciences
We wish to acknowledge Maa- ja vesitekniikan tuki ry (grant number 33446) and the European Regional Development Fund (as part of the HuJa project (A70942), “Enhancing the treatment of metal containing storm waters and wastewaters by using natural materials) for funding the study.
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0