In waste water treatment, It need to apply some quantity of current density.
But to get the better current efficiency, it need to know the relation between conductivity of waste water and required current density. I would like to know this relation.
As per law, with increasing conductivity of the samples, the required current density also increases but much it should be for better efficiency?
The current density in the electrochemical system is related to conductivity, system structure, electrode material and structure. Increasing current density is not gonna be efficient from a specific point. In that condition, you need to change some system structure (distance between the electrode, feed pathway) or electrode. I mean, you can improve the current density or energy efficiency of the system by modifying the distance between the electrode or feed pathway to make it easier to pass the water or solution. And, the electrode material and shape are also very important. You can enhance the current density by changing the electrode materials or structure. For example, open-structured (mesh type) electrode will make a faster reaction than the planar-shaped electrode.
In electrochemical treatment, some potential is applied to electrodes to have an electrochemical reaction. Variation of a solution conductivity corresponded to variation in current density that is needed to have a potential for the reaction. The energy efficiency of the reaction is dependent on how well this reaction go. This is subject for a research
In addition to above parameters, one of the critical parameter is flat band potential. To get the better performance, the applied potential should be slightly higher than flat band potential of your materials. You can check the flat band potential of your materials in the treatment solution, using the same EC work station.
The effecient seperation of holes/electron occurs after the applied potential is higher than flat band potential.
Dear Sir ( Dmytro Snizhko ),
With reference to your experience can we imagine the required current for a particular conductivity of wastewater.
Yes dear Dr D Bhagawan , at any given operating potential, as conductivity of the electrolyte increases, the ohmic resistance decrease hence current density increases. This increase in current density will not necessarily result in an increase in oxidation reaction rate (oxidation efficiency). In this case, the oxidation process becomes more cost-effective due to the increase in energy consumption.
Now, bear in mind that high current may leads to negative affect that reducing coagulation efficiency and also reducing electrode lifetime
Therefore at given wastewater conductivity there are optimum operating potential leads to current density values that gives maximum process efficiency. Yes it is process optimization for high process efficiency and low cost.
Best regards
Dear Sir ( Mohammed Hussein j. H. Al'Atia ),
Thank your for valuable information.
Can we figure-out the relation between wastewater conductivity and current density for optimum conditions.
Example. Conductivity : current density = 1:1 like wise any ration is posible?
Yes dear Dr Bhagawan Dheeravath
At same operating potential and other parameters, you can follow the ratio relation between wastewater conductivity and current density for any two operating cases as follow:
Conductivity 1/ current density 1 = Conductivity 2/ current density 2
Best regards
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