Hi Ivan,  you have given an extensive assessment of the development of the chemical properties of the water.  You seem to have come to the conclusion that the H2S has originated through the presence of organic matter at some stage.  There is a possibility that the medium through which the rain water permeates before reaching the aquifer (or even within the aquifer itself) contains iron pyrites where sulphur reducing bacteria are naturally present.  As the aquifer is pumped more oxygen is permeated to the iron pyrites layer, increasing sulphur levels in the aquifer.  This is the process of acid mine drainage - but results in higher sulphates and not sulphides.  Your further assumption of anoxic conditions due to the presence of some organic materials or environment where bacteria reduce the sulphates to sulphides may then be relevant. So it is suggested that an additional factor to consider is the increased sulphates due to pumping the aquifer and thereby introducing additional oxygen to water passing through a layer of pyrites.

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Hi Ivan,  you have given an extensive assessment of the development of the chemical properties of the water.  You seem to have come to the conclusion that the H2S has originated through the presence of organic matter at some stage.  There is a possibility that the medium through which the rain water permeates before reaching the aquifer (or even within the aquifer itself) contains iron pyrites where sulphur reducing bacteria are naturally present.  As the aquifer is pumped more oxygen is permeated to the iron pyrites layer, increasing sulphur levels in the aquifer.  This is the process of acid mine drainage - but results in higher sulphates and not sulphides.  Your further assumption of anoxic conditions due to the presence of some organic materials or environment where bacteria reduce the sulphates to sulphides may then be relevant. So it is suggested that an additional factor to consider is the increased sulphates due to pumping the aquifer and thereby introducing additional oxygen to water passing through a layer of pyrites.

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Thanks. This is very important information for me.

The fact that I could not understand where in a closed water circuit appears hydrogen sulfide and sulfite. Initially, the circuit is filled with clean drinking water passed through the softening filters. At the same time, if the circuit has equipment made of stainless steel or non-ferrous metals, there is an active corrosion of this equipment. The fact that I could not understand where hydrogen sulfide and sulfite appear in a closed water circuit. Initially, the circuit is filled with clean drinking water passed through the softening filters. After a certain period of time, if the circuit has equipment made of stainless steel or non-ferrous metals, there is an active corrosion of this equipment. Of course, a small amount of organic matter is contained in the feed water and in the circuit itself. Sulfur can enter the circuit only in the form of sulfate ion.

Therefore, I assumed that after removing oxygen from the water (water in the circuit can be heated to 100 degrees Celsius or more), anaerobic bacteria begin to develop. Perhaps in water is formed predominantly sulfite, not hydrogen sulfide. Nevertheless, the water receives a strong reduction reaction and, accordingly, there is an active corrosion of non-ferrous metals.

Once again, thank you very much for your comment.

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