By Hermann H. Hahn (auth.), Prof. Dr. Hermann H. Hahn, Dr. Rudolf Klute (eds.)
The biennial overseas Gothenburg Symposia on Chemical Water and Waste water remedy have confirmed to be a different platform for the alternate of principles and stories among directors, engineers and scientists lively within the fields of water offer, wastewater disposal and pollutants regulate. the 1st Symposium (Gothenburg, 1984) supplied an extended wanted survey over thought and alertness of chemical water and wastewater remedy. the second one Symposium (Berlin, 1986) was once dedicated to elements of recycling in chemical water and wastewater know-how. The 3rd Symposium (Gothenburg, 1988) known the starting to be want and the potentials of pretreatment. those court cases of the 4th Symposium specialise in know-how move from chemical remedy concept to sensible remedy of consuming water and commercial or family wastewater. The contributions are dedicated to questions of floc for mation and floc separation in addition to difficulties and sensible ideas linked to chemical compounds and dosing keep an eye on. specific recognition is given to the mix of chemical and organic approaches for nutrient removing from wastewater. it's the editors' privilege to recognize the precious support from the authors of this ebook. it's the editors' desire that they may show the importance and strength of chemical remedy in fixing the tough difficulties water purification, wastewater disposal and pollutants control.
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Additional info for Chemical Water and Wastewater Treatment: Proceedings of the 4th Gothenburg Symposium 1990 October 1–3, 1990 Madrid, Spain
Micro-filtration could be the most preferable process for the removal of colloidal or suspended particles. Today, two major kinds of micro-filtration membranes are available, namely ceramic membranes and organic membranes. 5 pm. Ultrafiltration membranes have an even smaller 30 N. 2 '- ~ C1) Q. ~ ... , Q. 2 ........... r-. 0 O. 005 ALT ratio Figure 17. Buoyant density vs. ALT ratio 100 ~ l---" / 500 1000 / / 5000 10000 Turbidi ty (me! Q ) Figure 18. Buoyant density vs. raw water turbidity pore size.
I J Figure 11. Particle destabilization and direct filtration removal efficiency versus polyaluminium dose_ Source: Klute  Comparison of Agitator and Ejector System Ventresque and Bablon  reported on practical experience with a coagulant injection system, installed in a water works at Neuilly-sur-Marne/France. In the past, the coagulant for the pretreatment process was fed into an agitated tank with a volume of 140 m 3 and a detention time of about 30 s. The average velocity gradient G generated was 400 S-l, calculated on the basis of the power consumption of the agitator.
Source: Klute and Dierschke  distance between the dosing unit for the coagulant stock solution and the mixing unit and thus the reaction time for the hydrolysis reaction could be varied by installing of pipe lines of different lengths. By means of this experimental setup it was possible to allow metal hydroxocomplex species to form as function of reaction time Llt before the destabilization process is initiated. The desired reaction time Llt = 0 s was achieved by dosing the coagulant directly into the mixing device (see Fig.