Abstract: . . .  can be reduced to a level lower than the detection limit of 5 PPB arsenic. Within detection accuracy, there seems to be no relation between feed water mass flow, evaporator inlet temperature and arsenic concentration in the distillate. By this, the feasibility of arsenic removal with the GOR mul- tieffect distillation process was proven. Further experiments investigating a possible dependence of feed water and distillate arsenic concentration are on the way. CONCLUSIONS In the paper, a short overview on the worldwide water situation as well as on conventional desalination technologies was given. Two small-scale, autonomous plants for stand-alone opera- tion in developing countries were described in detail and experimental results were discussed. . . .
. . .  420 l/h 30°C ? 85°C Feed Water End Arsenic Concentration 818 PPB < 5 PPB < 5 PPB < 5 PPB 738 PPB Electrical Conductivity 160 µS/cm 1 µS/cm 1 µS/cm 1 µS/cm 160 µS/cm Distillate Flow 15 l/h 18 l/h 26 l/h The results for three different operation parameters show clearly, that the arsenic level can be reduced to a level lower than the detection limit of 5 PPB arsenic. Within detection accuracy, there seems to be no relation between feed water mass flow, evaporator inlet temperature and arsenic concentration in the distillate. By this, the feasibility of arsenic removal with the GOR mul- tieffect distillation process was proven. Further experiments investigating a possible dependence of feed water and distillate arsenic concentration are on the . . .
. . .  Solarkollekto- ren, Technikum Rapperswil, Prüf- und Forschungsstelle Solarenergie, April 1994 xxx [5] H. Müller-Holst, M. Engelhardt, W. Schölkopf, Small Scale Thermal Sea Water Desalina- tion Systems for Decentralized Use: Optimization of System Design by Simulation, Desali- nation vol. 122, pp. 255-262, 1999 [6] H. Müller-Holst, M. Engelhardt, M. Herve and W. Schölkopf, Solarthermal Seawater De- salination Systems for Decentralised Use, 6 th Arab International Solar Energy Conference, Muscat, 1998 [7] www.hvr.se [8] www.dainichi-consul.co.jp [9] G. Jander, K. Jahr, Maßanalyse, 14. Auflage, Walter de Gruyter, Berlin/New York, 1986  . . .
. . .  contamination with arse- nic, experiments on arsenic removal with the GOR desalination plant were carried out. Therefor, the situation in W EST B ENGAL and B ANGLADESH was briefly discussed, and the experiments with a GOR ME 30 laboratory plant were described in detail. In preliminary experiments, multieffect hu- midification was found to be a suitable process for removing arsenic from contaminated well- water. The outstanding advantage of this process is the fact, that distillate arsenic concentration is no function of feed water concentration. By this, monitoring of feed water and distillate is not necessary and low maintenance of the plant is guaranteed. REFERENCES [1] J. Ayoub et al., Water Requirements and Remote Arid Areas: The Need for Small-Scale . . .
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