- Model BM-EVO - Multi‐Purpose Respirometer



BM-EVO is an advanced system of respirometry equipped with a programmable settings board for the atomatic control of the temperatura and dissolved oxygen, allowing tests to be adapted to the actual conditions of the process and change them if necessary.

BM‐EVO is a respirometer specially developed for practical and efficient biological wastewater treatment management, design and research.

  • Compact analyzer, with very low maintenance and user friendly operation
  • Direct oxygen measurements from a maintenance‐free oxygen sensor
  • No oxygenation restriction during test performance
  • Full control and results by means a powerful software already loaded in the PC of the system
  • Automatic software update versions from internet
  • Capacity for test conditions setting and modify them throughout the test performance.
  • Automatic measurements: OUR, SOUR, bCOD, rbCOD, sbCOD, U (COD utilization rate) and q (specific U)
  • Last, minimum, maximum and moving average results throughout any moment of the test
  • Several results at any time during the test and option to see them simultaneously on tabular or graphic modes
  • Option to open several stored tests and compare their results
  • Automatic temperature control integrated in the own console.
  • Package of measurements at any moment during test performance
  • Capacity for different respirograms and simultaneous overlying
  • BM respirometers measure data that can be directly input into modeling – simulating software
  • Option for a special reactor assembly for moving beds bio‐films (MBBR)

OUR static
From a mixed-liquor of the aeration tank it is determined the OUR & SOUR within the time and section we have selected in the corresponding respirogram.

OUR (mg/L.h) Total oxygen uptake rate from mixed-liquor.
SOUR (mg/g.h) Specific OUR

OUR cyclic
On this mode, the analyzer performs a respirogram within a programmed DO threshold and determines the corresponding OUR & SOUR in base of a continuous sequentially measurements.

R dynamic
A DO base line is fixed from an endogenous respiration activated sludge and then added a certain amount of sample to be analyzed. In the respirogram, continuous measurements of Rs are showed permitting the simultaneous and continuous determination of CO and bCOD. In this way we can track the values evolution along the time as an actual window of the substrate oxidation from activated sludge.

Rs (mg/L.h) Exogenous respiration rate corresponding to the substrate oxidation.
Rsp (mg/g.h) Specific Rs.
CO (mg/L) Consumed oxygen accumulated in the substrate oxidation (BODst)
bCOD (mg/L) Biodegradable fraction of total COD (bCOD) or Readily biodegradable fraction of COD (rbCOD)

Oxygen requirement and energy optimization
Actual oxygen requirement for any specific process. Optimal and minimum DO level in the aeration tank, without any detriment of the process efficiency.

Bioaugmentation control and tracking
By means the regular respiration rate measurement we can asses the result of the augmentation effect, to know if it is necessary to increase the dose of biomass and when it has reached its maximum effect.

COD fractioning
Automatic calculation of the COD biodegradable fraction (bCOD) or COD readily biodegradable (rbCOD)

Specific ratio of the biodegradable factions with total COD
Percentage of bCOD and rbCOD fractions within the total COD.

Operative parameter optimization
Loading rate (F/M), Sludge age (SRT) y Returned sludge rate (RR).

Nitrification rate (RN), Specific nitrification rate (AUR, qN), optimal DO range for nitrification, Necessary hydraulic time for ammonium-nitrogen removal, Nitrification capacity, minimum sludge age for nitrification (SRTN)

Starting from the actual value of rbCOD, it is possible to determine the actual nitrate concentration that the process is capable to remove. Starting from the specific respiration rate of the anoxic biomass, it is possible to estimate the corresponding denitrification rate (NUR)

Toxicity referred to one specific biomass
Fast screening qualitative test and by means of comparison of the actual respiration rates of one mixed-liquor prepared with the sample and another from one standard compound as reference.

Starting from rbCOD, N and P concentrations, nutrients ratio optimization.

Kinetic parameters
YH, qH, bH, kd, μH, YA, μA, …

Aeration cycle control in SBR systems.

Biomass carrier
Calculation of the total number of carriers per volumen unit, Amount of oxygen needs to maintain the biomass carriers under optimal condition, COD and Ammonium removal capacity.

Support for simulation programs
Such as GPS-X, BioWin, …

BM-EVO respirometer is an open system and, as such, supports all kinds of combinations to step into an endless number of applications.

  • Type : Optimized batch with closed recirculation.
  • Use : Laboratory.
  • Oxygen sensor : Maintenance free oxygen sensor. It is not necessary to replace neither membrane nor electrolyte
  • Measurements :
    • Dissolved oxygen (OD), Temperature.
    • OUR & SOUR, Rs & Rsp, CO (Consumed Oxygen} and bCOD determinations.
    • Calculation of U {Substrate utilization rate) and q {Specific U)
    • Measurements visualization  throughout the time on  tabular and  graphical  modes .
    • Results package overview at anytime. Data acquisition interval setting.
    • During the test, we get the last, minimum, maximum and average values.
  • pH control : In the test configuration it is possible to set the pH at which it should be performed and change it at any time during the test.
  • Test files : Automatic generation of a security file just when the test is starting. Possibility to save any test under the own software format and/or Excel.
  • Operation modes : Static, Cyclic and Dynamic controlled by a specific software loaded in the PC of the system. Automatic respirograms generation throughout the test. Preset test conditions {T, DO, pH, sample volume,...} and possibility to change them during its performance.
  • Aeration system : From a small air compressor and a ceramic diffuser. The air flow can be controlled by means the software for different percentages of air supply for a non limited time.
  • Respirograms : Automatic graphic respiromgrams generation with the possibility to overlay them for comparison. Zoom application for total or partial periods. Option for several data displays on simultaneous visualization, under tabular and/or graphic modes.
  • Partial measurements : During the test and to its finalization, there is the option to get selective partial measurements from the values table or from any selected period of the respirogram.
  • Dynamic calibration : Only for R mode the measuring system is calibrated by means the reaction of a chemical standard in distilled water, where the total oxygen demand is already known.
  • Biomass-carrier reactor : Option for a special reactor for biomass carriers to get all respirometry applications for any MBBR process type.
  • MBBR reactor : Option for a special reactor assembly for moving beds bio-films (MBBR)
  • Option for ORP : Option to measure the ORP (Redox) - Consult to Surcis -
  • Temperature : 10 to 509 C, by means a peltier & heating system, installed in the analyzer console, controlled by the software
  • Ouput : RS232 (for consolePC communication)
  • Display : LCD in sensor controller, LEEDS in front panel and PC screen.
  • Power : 230 ACV or 115 ACV (under demand} 50/60 Hz - 300 W
  • Dimensions/Weight : 50 x 40 x 46 (wide x deep x high) / 38 kg

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