Strong Sulfide Odour in Water

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I have a problem with very strong odour of sulfide before the RO and in the permeate water. The odour stays the same strength.

I know hydrogen sulfide passes as carbon dioxide.   

I am thinking of raising the pH to 9 and increasing the dose of antiscalant to stop dosing the acid before RO.

The water source is a well the depth of 25 m and water should be used for drinking and human consumption but due to the odour it can now be used almost only for washing clothes and irrigation.

Does anyone have suggestions on how to get rid of the sulfide odour?

I read a lot about hydrogen peroxide, aeration and chlorination but the retention time and treatment should be short. 

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24 Answers

You can dose your raw water ...

You can dose your raw water with  hydrogen peroxide before filtration, the reaction is faster { H2S + H2O2 = H2O  +  S}  and Chlorine can also be used  { H2S  +  HOCL  =  H2O + HCL + S } the hydrochloric acid formed can also serve as anti-scalant depending on the contaminant level of H2S in the raw water.

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You could dose some ...

You could dose some iron(II)chloride solution in order to precipitate sulphide as iron sulphide (FeS). Then you would have to separate the FeS sludge from the water by sedimentation / filtration. Alternatively you could also use some granulated iron hydroxyde filter or activated carbon which is suitable to remove H2S.

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H2S often occurs naturally in ...

H2S often occurs naturally in well water, or it can be caused by the presence of sulphate-reducing bacteria in a well or water system. Since bacteria are the most common cause, treatment to control them should be tried first. Shock chlorination is the standard treatment for control of sulphate reducing and iron bacteria in a well.
These bacteria also cause “biofouling” problems in water wells. Biofouling problems are related to the slimy bacterial deposits that build up in water wells. These slime deposits plug the intake areas of water wells, which reduces well capacity, as well as reducing water quality. Badly biofouled wells need to be professionally cleaned by a well driller. Simple shock chlorination by the well owner may not yield satisfactory results.
 

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You must reduce the hydrogen ...

You must reduce the hydrogen sulphite in your raw water. Best way would be an aeration step followed from a filtration step before your RO unit. For the filtration step you should use a Multi Media Filter with a filter material based on manganese dioxide.  The contaminated air of the aeration step you should also treated or you will get some trouble with the neighbourhood.

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