- Determine the average COD
(ppm) of the wastewater entering the treatment plant; composed of raw waste
entering a lagoon, primary effluent entering an activated sludge or effluent
from an industrial pre-treatment unit.
- Determine the average daily plant
influent flow-rate in millions of gallons per day (MGD) or thousands of
cubic meters PER DAY.
- Locate the flow rate (vertical
column on the left), in the appropriate dosage chart (USA or metric) and
select the appropriate level of COD at the top of the chart, listed under
the correct day of treatment (reading from left to right) to obtain your
- If your plant is recovering
from an upset, or is designed to the minimum Hydraulic Retention Time
(HRT) standard of >16 hours and a Mean Cell Residence Time (MCRT) standard
of >15 days, begin with the columns representing Days 1 and 2. Then
continue with the other columns, "Days 3 to 7" and "Days
8 to 30" as appropriate.
- If the plant is starting up,
multiply the flow rate by 1.5 and use the dosage for days 1 & 2 for
that level, then follow the dosages for the ACTUAL plant flow after that.
- If the plant is running fairly
well but needs a minor boost, just refer to the "Days 8 to 30"
- If your plant has a COD above
2000, divide the actual plant COD by 2000 and multiply the result by
the flow of the plant to obtain the "equivalent flow". Then select
doses for this "equivalent flow" under the columns marked COD
- If you prefer liquids, substitute
1 gallon of liquid for each pound of dry product recommended by the chart.
In metric, substitute 3.8 liters for each kg of dry product.
- If plant effluent levels have
stabilized after 30 days, dosage may be slowly decreased to 50%
of the "Days 8 - 30" level. Consult with your Alken-Murray
distributor before making this change.
- To equate volume with weight
in bran-based dry products (NOT exact due to variability of product density)
- 1 teaspoon of volume = 0.08 ounces
(2.5 grams) of weight
- 1 tablespoon of volume = 0.26
ounce (7.5 grams) of weight.
- 2 oz. volume scoop holds 1 ounce
(28 grams) weight
- 4 oz. volume scoop holds 55 grams
(1/8 lb.) weight
- 8 oz. volume scoop holds 110 grams
(1/4 lb) weight
- 1 quart of volume will equal 1
lb. (450 grams) weight