VELP BOD10 Biochemical Oxygen Demand Measurement System

Overview

The VELP BOD10 Biochemical Oxygen Demand Measurement System is a fully automated, respirometric BOD₅ analyzer engineered for precise, mercury-free determination of biochemical oxygen demand in wastewater, surface water, and treated effluents. Unlike conventional dilution or manometric methods requiring manual titration or mercury manometers, the BOD10 employs a high-stability electronic pressure transducer to quantify oxygen consumption in sealed BOD bottles via real-time pressure differential measurement—conforming to the fundamental stoichiometric relationship between O₂ depletion and microbial degradation of organic matter. The system operates on the principle that microbial respiration within a closed, temperature-controlled environment reduces headspace pressure proportionally to consumed oxygen; this change is converted into mg/L BOD₅ using integrated calibration algorithms aligned with ISO 5815-1:2019 and ASTM D5210. Designed for compliance-driven laboratories, the BOD10 delivers traceable, audit-ready data without operator intervention during the standard 5-day incubation period.

Key Features

• Mercury-free pressure sensing architecture compliant with EU RoHS and Minamata Convention requirements
• Configurable multi-sample operation: supports either 6- or 10-position sensor modules (BOD Sensor System 6/10), each with independent pressure transducers and microprocessor control
• Continuous low-shear magnetic stirring across all sample vessels ensures homogeneous oxygen distribution and eliminates sedimentation artifacts
• Embedded data logger records one BOD value every 24 hours—automatically generating the full 5-point BOD₅ profile required by regulatory protocols
• On-device display shows real-time BOD concentration (mg/L) and cumulative oxygen depletion trend; no external software required for basic readout
• Ruggedized stainless-steel (AISI 316) housing with epoxy-polyester anti-corrosive coating withstands repeated exposure to chlorine, sulfides, and acidic digestates
• IP54-rated enclosure enables reliable field-deployable use in humid laboratory environments or mobile environmental testing units
• Auto-alarm function triggers visual and audible alerts when measured BOD exceeds user-defined thresholds (e.g., 999 mg/L upper limit)

Sample Compatibility & Compliance

The BOD10 accommodates standard 300 mL BOD bottles (glass or PET) fitted with VELP’s proprietary septum-sealed caps containing integrated CO₂ absorption pellets (NaOH or LiOH). It is validated for use with raw sewage, activated sludge supernatants, industrial effluents, and potable water matrices following appropriate dilution per APHA Standard Methods 5210B. Regulatory alignment includes full support for EPA Method 405.1 (equivalent), ISO 5815-1:2019 (water quality — determination of biochemical oxygen demand after n days — Part 1: BOD₅), and EN 1899-1. All firmware and calibration routines are documented per GLP requirements, with timestamped event logs supporting 21 CFR Part 11-compliant data integrity when paired with VELP’s optional LIMS-integrated software suite.

Software & Data Management

Raw pressure data, ambient temperature logs, and calculated BOD values are stored internally for ≥12 months (circular buffer). Export is supported via USB-C interface to CSV or Excel-compatible formats. Optional VELP BOD Connect software provides graphical trend analysis, statistical outlier detection (Dixon Q-test), batch reporting templates aligned with ISO/IEC 17025 accreditation, and electronic signature workflows. Audit trails record all parameter changes, calibration events, and user logins—meeting ALCOA+ principles for data reliability and long-term archival.

Applications

• Wastewater treatment plant performance monitoring (influent, effluent, and sludge digestion streams)
• Environmental impact assessment (EIA) studies for industrial discharge permits
• Research on biodegradability kinetics of novel organic compounds (e.g., pharmaceuticals, surfactants)
• Validation of tertiary treatment efficiency in membrane bioreactors (MBRs) and constructed wetlands
• Quality control of drinking water source protection programs under EU Water Framework Directive Annex V
• Educational laboratory instruction for environmental engineering curricula requiring hands-on BOD₅ methodology

FAQ

What standards does the BOD10 comply with?
ASTM D5210, ISO 5815-1:2019, APHA 5210B, EN 1899-1, and EU Directive 2000/60/EC.
Can the BOD10 measure BOD beyond the standard 5-day period?
Yes—incubation duration is programmable from 1 to 28 days, enabling extended BOD₂₀ or nitrogenous BOD (NBOD) assessments.
Is external calibration required before each run?
No—factory-traceable pressure transducers are pre-calibrated; users perform only zero-point verification using nitrogen-purged blanks prior to assay initiation.
How is CO₂ interference eliminated in the measurement?
Each BOD bottle cap contains a replaceable CO₂ absorbent pellet (NaOH or LiOH), ensuring only O₂ consumption contributes to pressure change.
Does the system support remote monitoring?
When connected to VELP BOD Connect software and a local network, real-time status and partial results can be accessed via secure HTTPS dashboard.