Sunday, August 4, 2013

How Do I Know How Much Peroxide to Inject?

Dear sir,

I currently have a chlorine injection system but have heard about injecting peroxide instead - would i have to change any equipment and how do i know how much peroxide to inject?


Bill R
Austin Texas


Thanks for emailing Bill.  This is a good question.

A peroxide injection system needs to use a peristaltic type metering pump, or if you have a diaphragm type metering pump, you will need to make sure it has an air release valve.   When peroxide is added to water a lot of oxygen is released into the water causing tiny air bubbles.  These bubbles can cause a diaphragm type chlorinator metering pump to lose its prime and fail to pump.

We often use a Stenner peristaltic pump (see below) for pumping peroxide as it is not affected by a lot of air or gas in the solution it is pumping.

After injection with peroxide a catalytic carbon backwash filter is typically used, which filters out iron, sediment, and other particles.  The combination of peroxide injection with catalytic is synergistic, and the two work great together. The catalytic carbon works best when there is a lot of dissolved oxygen in the water, and can remove high levels of odor and iron and kill bacteria at the same time.

Catalytic Carbon also removes residual peroxide, dissolved oxygen, along with other tastes and odors from the treated water as well.


Metering Pump & Tank: 45MHP-10 Stenner Pump with 15 gallon heavy-duty polyethylene solution tank;

Pump output 0.5 to 10.0 gallons per day (1.9 to 37.9 liters per day); voltage 115 or 220V same price; 60 Hz. This is a complete system that comes with everything you need: solution tank; metering pump; tubing; fittings; and injection check valve.




Tank Contact Mixing 30 Gallon 1-1/4 inch inlet.

Tank Contact Mixing 30 Gallon 16 x45The CT-30 tank is a durable easy-to-install retention tank designed to provide optimum contact time during chemical treatment. These lightweight seamless totally non-corrosive retention tanks are ideal for new and replacement installation where durability is at a premium. 100% non-metallic polymer materials. Impervious to chemical attack.

http://www.cleanwaterstore.com/T2000760-p-contact-tank.html

Dimensions:  16” D x 45”



 




Centaur Carbon 7000 Backwash, 1.5 cubic Foot 7000


Centaur Carbon 7000-SXT 1.5 CF
All the filter media you need for the system is included. Excellent for use in de-chlorinating water, residual peroxide, removing chloramines, and removing many tastes and odors.  Very effective catalytic carbon for removing impurities from water and suitable for a home like yours with 2 bathrooms.

Much longer life and higher flow rates than standard carbon. Unlike carbon cartridges which can trap sediment and dirt causing pressure drop these systems automatically backwash out trapped sediment alleviating pressure drop.

Dimensions:  10” Diameter x 61” Tall with control valve.  ¾” or 1” pipe connectors and bypass is included.  We also provide full installation and start-up guides directly to you and are available for Tech-support.

http://www.cleanwaterstore.com/CF002100-p-centaur-carbon-7000.html



Hydrogen Peroxide NSF Grade for Drinking Water

Case of 4  1-gallon containers   $60.00  ($15 per gallon)

Safe 7% solution.

Average use is 1/2 gallon to 1 gallon per month depending on level of contaminants and amount of water used as a whole.