Development of a precipitation based separation scheme for selective removal and recovery of heavy metals from cadmium rich electroplating industry effluents

2006-01-01
Islamoglu, Sezin
Yılmaz, Levent
Ozbelge, H. O.
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
218
views
0
downloads
The treatment of electroplating wastes is a serious worldwide problem, because of their high content of many different heavy metals. Chemical precipitation based treatment methods could be an important alternative for fractional selective separation of heavy metals if they are systematically developed by sequencing of pH, adjusting the added portions of precipitating agents, and selecting the optimum time period before removing the precipitate from the solution. In this study, for selective removal and recovery of Cd from real electroplating bath wastewater (containing high amounts of Cd, medium amounts of Zn, Cu, Fe and small amounts of Ni, Co, Mn), a precipitation based separation scheme was developed. The scheme comprised of three consecutive steps: 1) Acid treatment with nitric acid (HNO3). Cyano-metal complexes were decomposed in acidification step and complete removal of iron was achieved. 2) Alkali precipitation by sodium hydroxide (NaOH). Large portion of Cd was recovered as pure Cd(OH)(2). 3) As a polishing step sulfide precipitation by sodium sulfide (Na2S) was applied. pH was the critical parameter in sulfide precipitation. Addition of sodium sulfide in alkali pH range led to cadmium precipitation whereas copper was totally precipitated in acidic pH range. The sulfide precipitation step may be replaced by more environmentally friendly steps (e.g. polymer enhanced ultrafiltration) until the heavy metal concentrations were reduced down to suitable discharge limits.
Hydroxide Precipitation, Sulfide Precipitation, Heavy Metal Removal, Cadmium, Iron, Copper, Electroplating Waste
https://hdl.handle.net/11511/42596
SEPARATION SCIENCE AND TECHNOLOGY
Department of Chemical Engineering, Article

Suggestions

Quick Discrimination of Heavy Metal Resistant Bacterial Populations Using Infrared Spectroscopy Coupled with Chemometrics
Gurbanov, Rafig; Ozek, Nihal Simsek; Gözen, Ayşe Gül; Severcan, Feride (2015-10-06)
Lead and cadmium are frequently encountered heavy metals in industrially polluted areas. Many heavy metal resistant bacterial strains have a high biosorption capacity and thus are good candidates for the removal of toxic metals from the environment. However, as of yet there is no accurate method for discrimination of highly adaptive bacterial strains among the populations present in a given habitat. In this study, we aimed to find distinguishing molecular features of lead and cadmium resistant bacteria usin...
Design a cadA-targeted DNA probe for screening of potential bacterial cadmium biosorbents
İçgen, Bülent (Springer Science and Business Media LLC, 2015-11-20)
Due to their metal removal ability, bacterial biosorbents can be effectively used for the treatment of wastewaters containing heavy metals. Searching for bacterial biosorbents for hazardous heavy metals like cadmium is a pivotal for remediation efforts. The gene cadA, that mediates resistance to cadmium over an ATP-dependent efflux mechanism, provides a good target for the selection of potential cadmium biosorbents. For this reason, in this study, a 36-mer-oligonucleotide DNA probe based on the entire 3.5-k...
Expression of genes encoding fundamental copper homeostasis proteins in copper resistant escherichia coli mutants
Uyanık, Tuğçe; Gözen, Ayşe Gül; Department of Biotechnology (2019)
Heavy metals are used as antimicrobial agents for thousands of years. Their areas of usage include water and food disinfection, preservation of food and beverages, prevention of dysentery, treatment of leprosy, tuberculosis, gonorrhea, syphilis, an alternative to laundry detergents and biocontrol agents for crops of fruits in developing countries. Copper is one of the widely used heavy metals for its antimicrobial property. On the other hand, it is an essential heavy metal for the most living systems. Over ...
Development of fluorescent whole-cell bacterial bioreporters for detection of inorganic arsenic and cadmium
Elçin, Evrim; Öktem, Hüseyin Avni; Department of Biotechnology (2019)
Environmental heavy metal contamination in many regions of the world is a serious problem of ecological health. Fast and constant monitoring of their levels is significant for both preventing their accumulation and taking an immediate action for removal. As an alternative approach to standard laboratory techniques, various biosensor systems for detection of heavy metals have been proposed. Bacterial biosensors hold great promise for in-field detection of heavy metals. In this study, two different whole cell...
Development of sol-gel catalysts by use of fast combinatorial synthesis and high throughput testing techniques for catalytic oxidation of propylene to propylene oxide
Düzenli, Derya; Önal, Işık; Şeker, Erol; Department of Chemical Engineering (2010)
Propylene oxide (PO) is an important raw material for the chemical industry, which is produced commercially by the chlorohydrin process and hydroperoxide process. However the deficiencies in these processes have given rise to considerable interest in the development of a direct route to PO that does not produce by-products or coproducts. The development of novel, active and selective catalysts for gas phase oxidation of propylene using molecular oxygen were studied via testing a large number of catalysts by...
Citation Formats
S. Islamoglu, L. Yılmaz, and H. O. Ozbelge, “Development of a precipitation based separation scheme for selective removal and recovery of heavy metals from cadmium rich electroplating industry effluents,” SEPARATION SCIENCE AND TECHNOLOGY, pp. 3367–3385, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42596.
METU IIS - Integrated Information Service open@metu.edu.tr