| Autor: |
Spankie, Sally, Southway, Colin, Moodley, Kuveshnee |
| Zdroj: |
Proceedings of the International Conference on Waste Technology & Management; 2007, p1130-1141, 12p |
| Abstrakt: |
This paper describes the industrial monitoring undertaken on a phosphating system introduced by a racking manufacturer in South Africa. The phosphating of the workpiece surface was carried out in two successive steps followed by rinsing. Chemical sampling and analysis of the phosphating and rinse solutions and of the sludge as well as waste minimisation analyses of the chemical and water usage were carried out over a five month period called the monitoring cycle. This research analysed the trends in depletion and build up of seven elements from one hundred and twenty four samples collected from the two phosphating and two rinse solutions making up the phosphating line. In the case of the rinse solutions, the concentrations of sodium, phosphorus and molybdenum, rose significantly between charging and dumping the rinse tanks. High iron, phosphorus and sodium levels were recorded for the sludge samples recovered at the end of the second monitoring period. The results showed that although water usage was not excessive, the loss of unused raw materials to the wastewater represented a waste minimisation opportunity through reuse of the rinse water in phosphating solutions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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