- Model BM-Advance - Multi-purpose Respirometer



Within the BM respirometer series, besides to be equipped with a programable and automatic system for temperature and dissolved oxygen control, it is distinguished from the rest by also being equipped with a programmable system of pH control and ORP monitoring in the Advance Pro model. BM-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 mointenance-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
  • pH monitoring and automatic control system
  • Option for ORP monitoring, simultaneously to pH
  • 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): Oxygen Uptake Rate.
SOUR (mg/g.h): Specific Oxygen Uptake Rate.

OUR Cyclic

On this mode, the analyzer performs a respirogram within a programmed DO threshold and determines the orresponding OUR & SOUR in base of the continuous sequentially executed 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).
  • Influence of the temperature, pH and oxygen and other conditions on the activated sludge process
    Thanks to the capacity to set and modify the test conditions, we can analyze the influence of any of them (or any combination) in the biomass activity and figure out break‐points, optimum and minimum working levels.
  • Operative parameter optimization
    Loading rate (F/M), Sludge age (SRT) y Returned sludge rate (RR).
  • Nitrification
    Nitrification rate (AUR), Specific nitrification rate (SAUR, qN), optimal DO range for nitrification, Necessary hydraulic time for ammonium‐nitrogen removal, Nitrification capacity, minimum sludge age for nitrification (TRCN).
  • 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
    For heterotrophic and autotrophic biomass.
  • SBR
    Aeration cycle control in SBR systems.
  • Biomass carrier (MBBR)
    By making use of a special reactor we can calculate the total number of carriers per volume unit, Amount of oxygen needs to maintain the biomass carriers under optimal condition, COD and Ammonium removal capacity, and rest of same applications we can do in a normal activated sludge process.
  • Support for simulation programs
    Such as GPS‐X, BioWin, …
  • Others
    BM‐Advance 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 and pH.
    • OUR & SOUR, Rs & Rsp, CO (Consumed Oxygen) and bCOD determinations.
    • Calculation of U (Substrate utilization rate) and q (Specific U)
    • Measurements visualization on tabular and graphical modes throughout the time.
    • Overview of the results package at any time. 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 thorughout 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 generation of graphic respiromgrams with the possibility to overlay them for comparison. Zoom application for total or partial periods. Option for the simultaneous visualization of several data displays 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 50º 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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