BIOGAS CALCULATIONS:
Multiply the scfm  or standard cubic feet per minute by the concentration of Hydrogen sulfide in parts per million and then multiply by 0.000125 and you will get the Hydrogen Sulfide/day amount listed in lbs.  If you multiplied the scfm of contaminated gas by the concentration of Hydrogen Sulfide in parts per million and then multiplied by
0.00005684  you would have the treatment rate of WS-1500 recommended in gallons/day.  The minimum required amount would be half that, but may not be applicable if Sulfree is used in a scrubber because of gelling problems, and may not be applicable in digestors because of poor mixing problems and anaerobic digestion of Sulfree. 

Another group of calculations for Biogas would include the following:
(based on anaerobic conditions and 7 molecules/molecule Sulfree)

Millions of cubic meters per year times 67.18 = cubic feet per minute

Weight of Hydrogen Sulfide in lbs times 4.0 equals weight of Sulfree WS-1500 recommended to treat it.  Often, suppression may be 1/2 of what treatment recommendations are.

Weight of Hydrogen Sulfide  times 0.50 = # gallons Sulfree WS-1500 recommended to treat it.

Millions of cubic meters per year times concentration of Hydrogen Sulfide in parts per million times 3.06 = lbs of Hydrogen Sulfide per year

These numbers  have  to do with a tank that has throughput of gallons in and gallons out per day.  This number of gallons of treatment would be applied to the inflow of the digestor or to a scrubbing system attached to the digestor.    This does not treat the system as a whole.

You must also treat the digestor itself to bring the entire system under control.  In some cases the concentration of Hydrogen Sulfide in the gas was known, but the concentration of Hydrogen Sulfide in the liquid was not.  A good guess is always that the liquid contains approximately 20 times the amount of Hydrogen Sulfide seen in the gas above it.  Here that number would correspond to a contamination level of 180 ppm in the liquid.

For the next calculation, you need the volume of liquid/solid in the digestor itself, divide by one million and multiply by the concentration in ppm and divide by 1.8.  This will give you the amount of WS 1500 in gallons necessary for an initial shock addition to the digestor.

One other option that may be cheaper to a ranch that is doing biogas reclamation is our treatment method for dairies.

The treatment method presently in use applies WS1500 to the water used to wash down stalls and/ or cattle which then washes down to a holding tank for initial settling and then into a holding pond, which is used for the makeup water.  This also eliminates almost all the odors generated by the dairy.

Sulfree™ for Refineries

CATTLE CALCULATIONS:
This method uses 4 gallons per day of Sulfree WS1500 on an 18000 gallon wash water volume and that treats the holding tank and the pond. The holding tank was a 20,000gal holding tank which also needed a 6.5 gallon initial shock treatment and the pond which required about a 25 gallon initial shock treatment for a 1 million gallon pond.  If the wastes generated are treated with Sulfree, enzymes and bacteria will be freed up to react preferentially with the waste, creating more bio-gas and generating less Hydrogen Sulfide and without much more treatment necessary.  ( the dairy spoken of was operating with about 400 cattle).

AERATED WASTEWATER CALCULATIONS:
Wastewater treatment has different calculations.  For aerated tankage, ponding and headworks, the daily recommended treatment level is determined by multiplying 
3 times the daily treatment volume in millions of gallons times the concentration of Hydrogen Sulfide in the water expressed in ppm.  This equals the recommended treatment rate for Sulfree WS 1500 in aerobic systems.  Some systems will require more, some less, due to degree of agitation, degree of aeration and contamination level variance.  This recommended treatment level assumes some fluctuation in the system, upwards or downwards in volume or concentration.

ANAEROBIC WASTEWATER CALCULATIONS:

Anaerobic treatment of wastewater occurs at different rates due to no catalytic activity of the Sulfree molecule and due to the common problems of poor mixing.  Anaerobic treatment rates should be calculated at 2-5 times the recommended treatment rates for aerobic systems.  More than one point of addition always assists in the achieving of odor reduction.  At 3 times the recommended treatment rates for aerobic systems, an anaerobic system with good mixing and reasonable holding times will be effective in reducing and controlling odor.  7 times the recommended rates for aerobic systems is necessary when there are long resonance times in the system and where poor mixing is the norm.  Sulfree effectiveness is greatly improved by mixing, mainly because we in general have low addition rates, so one molecule in a million can catch up to one molecule in a million and have a reaction.

San Francisco Water Treatment