Development of the following tests by Arthur Technology (now
Respirometry Plus) began over 40 years ago when the Arthur
Respirometer was introduced. The tests have been used by
operators, technicians and consultants worldwide. Customers
receive detailed written instructions for performing these tests,
or they may choose to learn through our Distance Training
program - one-on-one training sessions conducted by phone
and fax.

. Influent Characteristics Tests - This is where good plant
operation begins, with timely, upfront information that gives you
a real time look inside the process.

          Organic Load (amount of food)       
      Treatability  -  Treatment Time

Toxicity – Carbonaceous – Nitrogenous

            Rapid Response Test (15 minutes)

            Influent Inhibition Test

Process Control Tests - Use these tests for Economical
Operation, Increased Plant Stability, Meeting Effluent Limit


 . Anticipatory Aeration Control   . Equalization Control
. Wasting Control

                      . Control of Viability
 . Return Sludge Control               . Nitrification/Denitrification
 . Fb/Mv Control                            . Biosolids
                     . Anaerobic Digestion

Troubleshooting Tests - These tests should be run while the plant
is functioning well. With graphs of "good operation" in hand, you will be
well prepared to pinpoint and solve problems quickly when they occur.

               Typical Respiration Graph

. at the Inlet   . at the Outlet    . at the Return Sludge

     Viability Index - How lively are the "bugs" ?

     20-Minute Performance Test




TWO TOXICITY TESTS - Rapid Results Screening Test and the
                                              Influent Inhibition Test

adding sample to respPreparing the Test
In one chamber suspect sample is
added to endogenous sludge from
the wastewater plant. Endogenous
sludge alone will be added to the
other chamber as a comparison.

Graphic Test Results



Compost Process Control Testing

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Compost Tiers The Arthur Respirometer is capable of measuring respiration
of raw samples by providing a continuous record of changes
in oxygen use. In this application the solid compost is placed
on a tier of perforated stages within the sample chamber
and air circulates freely through the compost..

Stability Testing of the Final Product - A Stress Test


In this test, the compost sample is tested in an
acqueous solution. This produces an environment
in which there is intimate contact of food, micro-
organisms and oxygen. Even small amounts of
food are available for metabolizm by the
microorganisms. This test ensures that the compost
is stable.

Soil Biodegradability Testing - using either the Automated
or the Simplified Respirometer.

Landfills have become a common method of disposing of municipal solid
wastes in many communities.If the waste products are organic, it is likely
that metabolic activity (probably anaerobic) will take place. The probability
of it taking place can be determined by either performing solid tests or
acqueous tests in the respirometer. Either method will determine whether
or not toxins are present in the landfill.

new canada test

Reference: CAN/BNQ 0413-220  Organic Soil Conditioners -
Composts - Determination of Respiration Rate -
Respirometric Method.
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