As solar pond have almost zero salt concentration at top and increases with depth and has up to 20 to 30 % at bottom, I want to know what problems will occur while developing such salt concentration ?
and what will be the effect of diffusion on small pond of 2 m^2?
Mean to create / make? In solar pond we have to make concentration of salt high in bottom.
So how can we make ? and what is effect of diffusion ? how to calculate it ?
Mahesh how deep are these ponds you are talking about? From a physical point of view inreasing temperature and salinity will change the density of water but not necessarily incresing it, remember this relationship is not linear. From a biological point of view, different kind of microalgae will develope as salinity chages, pH may change and bacterial cycling may too. Chemically the cycling of nutients may change, specially nitrogenated ones.
Here is what you need, look for it I do not have it
http://onlinelibrary.wiley.com/doi/10.1002/er.4440090410/abstract
Wish you luck
i have taken 2.5 meter deep pond.. I want to know how fast will diffusion occur in pond ?
then how concentration changes ?
as salinity increase density also increases.
Two methods are often used to establish the salinity gradient in solar ponds
The First method is the salinity redistribution method (Zangrando 1980):
The procedure of this technique consists of partially filling the pond with high salinity solution. Fresh water is then injected through the diffuser, which is immersed in the upper portion of the existing solution. The brine above the diffuser will be progressively diluted while the diffuser, as well as the water level, rises. Finally the diffuser reaches the water surface at the predetermined ending level. This method is commonly used worldwide to establish the salinity gradient in solar ponds.
for more on this method see this https://www.researchgate.net/publication/242631098_Study_of_temperature_and_salinity_profiles_development_of_solar_pond_in_laboratory
In the second method the pond is filled with several layers of salt solutions with successive layers of different salinities one on top of each other. And at the end of the process, the different layers merge into each other to provide a relatively linear profile with salinity increasing with depth. This method is satisfactory for small ponds.
For the second part of your question:
The salt diffusion from the lower convective zone to the surface is estimated by Tabor and Weinberger. And it is about 60 to 80 g / m2 / day for solar ponds using NaCl, and about 37g / m2 / day for solar pond using MgCl2.
Article Study of temperature and salinity profiles development of so...
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