Hydrogen sulphide removal from drinking water

Dear friends, We have wells in sandstone area and recently we increased the depth of these bore wells from 600 ft to 700 ft. Since then, we have started getting smelly water and the pipe infrastructure is also corroding. When we did the chemical analysis we found out that the drinking water has hydrogen sulfide at the level of 4 mg/l. Some naturally found anaerobic bacteria are forming this in soil and we can not stop it. So the best way is to remove the H2S from the water. Our technical guide has asked us to opt for aeration, but your suggestions about some other options as well are welcomed.  We have only these three wells as the water source for a village, and we need to solve the problem asap. Also the recommended method should be very economical... :) Thanks, Anita.