Removal of H2S (hydrogen-sulfide) from water 1

[MirJev]

Hi everybody, I have to ask for help, once again.
I have to design a process for H2S removal in a break-pressure chamber that is part of a water supply system. I've attached a cross-section of a chamber, with all the pipelines, for you to get a picture of it.
The problem is: the only thing I can change inside the chamber is pipes, which means no additional equipment may be installed. This leads to a conclusion that aeration is the only feasible process. I don't have the data about the H2S concentration, only pH which is 7.85 on average. I am aware that in order for the aeration to be efficient, pH should be around 6, so I guess I would have to include some upstream acid dosage, right?
As for the system itself, I see two possible solutions: upward or downward dispersed flow of water through nozzles (see attached pictures 1 and 2), in order to make as much contact surface between water and air as possible.

Thank you in advance for your opinion, suggestions, advice, etc.
Mirko

http://files.engineering.com/getfil...-b65959de98c9&file=Break-pressure_chamber.pdf

http://files.engineering.com/getfile.aspx?folder=b4e8fc5f-1704-49be-8efa-36f1f44ec22a&file=1.jpg

http://files.engineering.com/getfile.aspx?folder=25a0f301-adcb-4040-a352-ffd274f7f8fa&file=2.jpg

 

[bimr]

Mirko,

Not much point to comment on this application since the amount of H2S is unknown. A complete water analysis is also necessary, if you would like to know the amount of acid required.

What is the purpose of the "break tank"?

H2S is a toxic gas. Is there exposure to personnel?

 

[MirJev]

Bimr,
If I understood it correctly the purpose of a break-pressure chamber is to reduce the pressure in a pipeline to atmospheric, i.e. hydrostatic pressure. I am not quite sure if this is the correct answer.
The chamber is on a hill, quite remote, and there is no danger of exposure.
Someone noticed a bad odour, and concluded that the source is H2S, and now they want it out of the water. It is up to me to propose the solution. I will ofcourse request for a detailed analysis of water, but I have to propose a solution.
Please give me some guidelines. Am I on a right path?

Thank you

 

[bimr]

The best solution may be to install a tray or cascade aerator on top of the break tank.

http://www.frwa.net/uploads/4/2/3/5/42359811/frwacdwatertraining052213.pdf

 

[dik]

Bimr... looking at the first few pages, that is a great resource of information. Thanks.

Dik