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Green technology for detection and removal of heavy metal ions from wastewater

Asipari builds an online-based real-time multi-heavy metals biosensor and purification method achieving information- and being decision support system for urban and industrial water quality assessment and management integrating on-line monitoring and modeling, in support of relevant eu directives.

Green technology for detection and removal of heavy metal ions from wastewater. The occurrence in the environment of considerable quantities of toxic metals such as, mercury, lead, cadmium, zinc, lead or others, poses serious health risks to humans, and this threat puts the scientific community under pressure to develop new methods to detect and eliminate toxic contaminants from wastewaters in efficient and economically viable ways. The technology we suggest is a stripping analysis, which allows ultrasensitive detection of heavy metals. In most cases, anodic stripping follows cathodic deposition and enables a sensitive determination of mercury, lead, cadmium, zinc and other ions. The reverse procedure-namely, anodic deposition followed by cathodic stripping-was first developed for the determination of halide ions, and was also examined in the detection of iron ions (1,2). In both stripping analyses the metal ions are deposited and concentrated on the electrode. The subsequent linearly changing opposite voltage results in a stripping peak. The height and area of the peak are proportional to the deposition time and the metal concentration. In this method of analysis, the solubility and the electrical conductivity of the deposit as well as the precise control of the mass transport are important. Following the same line, the researchers from the Lab Sensors in Tel Aviv University, managed by Prof. Judith Rishpon, have achieved a great improvement in analysis by creating new electrochemical sensors. The On-line Heavy metal analyzer can consistently measure very low concentrations of target metals in sample streams and can be used for both process control and environmental monitoring. Routine calibration techniques using standard addition curves ensure valid analytical data, regardless of matrix fluctuations and can also highlight instrument malfunction. The analyzer will use both a square wave and a pulse procedure. These are well established electrochemical techniques have several internationally recognized method approvals. The active area of the electrodes will be considerably increased by addition of nano- particles that will amplify the signal. The measurement device will include the following components: -Cheap printed screen electrodes modified with nanoparticles -A flow system -A palm held electrochemical apparatus connected to a palm computer. The anticipated chemical system specifications are: Analytical range between 0.001 ppm – 100 ppm; Precision +/- 5 % at 0.001 ppm; Calibration using standards Standard Element Configuration: Zn, Cd, Pb, Cu; Zn, Cd, Pb; Cd, Pb, Cu; As; Hg; Ti, Bi; Fe2+, Fe3+ Cr6+ The instrument specifications: On-line continuous monitoring; Low maintenance and running costs Easy to use Industry standard PalmSenseVIEW software; Parts per billion (ppb) detection limits Multi-element capability, e.g. Fe, Zn, Cd, Pb, Cu; Sample pretreatment modules available; Experimental Curve and historical data; Data storage on internal disk or via network connection or modem. Consequently the proposed technology of metal analysis is faster than the currently used methods that require transfer to central laboratories, employs a very small and simple apparatus, enables on line data acquisition and immediate evaluation and interpretation of results. Together with the added benefit and accuracy of the analysis, this technology will results in important economical benefits for industry and society. References: 1.Kunibiko Y., et al-The Determination of Iron in Seawater Using Catalytic Cathodic Stripping Voltammetry, Electmanalysds, 4 (1992) 65-69 2. C. C. Young, et al- Anodic Deposition and Cathodic Stripping of Iron in Acetate Medium, ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972
Acronym: 
ASIPARI
Project ID: 
5 823
Start date: 
15-11-2010
Project Duration: 
36months
Project costs: 
1 000 000.00€
Technological Area: 
Water Pollution / Treatment
Market Area: 
Water treatment equipment and waste disposal systems

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.