- 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 temperature and dissolved oxygen, allowing tests to be adapted to the actual conditions of the process and change them if necessary.

  • Compact analyzer, with very low maintenance and user friendly operation
  • Specially designed for two tempered reactors which can run simultaneously controlled by two
  • software (one per reactor) loaded in the PC.
  • Direct oxygen measurements from a maintenance-free oxygen sensors
  • No oxygenation restriction during test performance
  • Full control and results by means a powerful double software already loaded in the PC
  • Automatic software update versions from internet
  • Capacity for test conditions and  indistinctly setting and  modify them throughout the test
  • performance for each of the reactors.
  • Automatic measurements: OUR, SOUR, bCOD, rbCOD, sbCOD,    U (COD utilization rate) and q
  • (specific U) from the current running tests in the reactors.
  • 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.
  • Capacity for Excel exportation
  • Option to open several running and stored tests to be overlaid and compared
  • Automatic temperature control integrated in the own analyzer
  • Package of measurements at any moment during test performance
  • 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)
  • U (mg COD/I.h) : Substrate utilization rate
  • q (COD/SS.d) : Specific substrate utilization rate

  • 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
    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)
  • Denitrification
    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.
  • Nutrients
    Starting from rbCOD, N and P concentrations, nutrients ratio optimization.
  • Kinetic parameters
    YH, qH, bH, kd, μH, YA, μA, …
  • SBR
    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, …
  • Others
    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 505 c, by means a peltier & heating system, installed in the analyzer console, controlled by the software
  • Ouput : RS232 (for console <-» PC 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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