Water Purification Systems
Hydrogen peroxide is used in several different types of water purification devices. If you are looking to remove a sulfurous or rotten egg-like smell from your water, then you may be able to use a hydrogen peroxide injection (chlorine can also be used). The small amount of hydrogen peroxide in the water will spread and destroy the sulfide creating the odors. You can also use a sand filter to clean out the resulting particles if you want.
Hydrogen peroxide is also combined with ozone gas in many systems. The two substances are similar--both have extra oxygen atoms that make them able to oxidize very easily, so easily that they tear microscopic substances apart until there is nothing left. The systems that use combinations of hydrogen peroxide and other oxygen rich substances like ozone are known as AOPs, or advanced oxidation processes. You should consider an AOP system if your water continuously has a bad taste or odor--especially if you use well water, since many water treatment plants already make use of this system. AOPs may also be combined with UV light radiation devices.
Recipes for Odor Removal
You can also use combinations of hydrogen peroxide and water to remove odors that may stick to fabrics in the household. Household hydrogen peroxide is a weakened solution, typically only around 3 percent actual hydrogen peroxide, but it can still be potent. If you want to kill bacteria to remove odors in a certain location, trying mixing the hydrogen peroxide in a solution of water. Use a half and half ratio, but only apply a tablespoon or so at first. You should also use a small test area of the fabric or carpet first, since the peroxide can bleach out colors if you are not careful. Using other treatments such as vinegar or baking soda before using hydrogen peroxide can be very effective.