BIOX-1010 is an on-line analyser for continuous BOD measurement in industrial and municipal wastewater treatment plants. BOD data are generated with a lag time of only 3 to 15 minutes, with a standard measurement range of 20 to 1500 mg/liter BOD and available ranges covering 5 to 100,000 mg/liter. The real-time BOD data correlate well with five-day BOD5 laboratory results.

Wastewater is continuously pumped through a sample bypass. The peristaltic pump built into BIOX continuously feeds a small stream of wastewater from the sample bypass to the bioreactor. Before it reaches the bioreactor, this wastewater stream is diluted with oxygen-saturated dilution water supplied by a gear pump.

Inside the bioreactor, microorganisms grow inside small plastic cylinders where they are protected against mechanical abrasion caused by turbulent mixing. The respiration rate of the microbial population is automatically maintained at a constant level by a feedback loop that varies the dilution ratio. Increasing contamination of the wastewater increases the respiration rate, which in turn increases the dilution rate. Similarly, if the contamination level of the wastewater decreases, so does the dilution rate. The wastewater concentration in the reaction chamber is thus kept at a constant, low level, and the mixing ratio of wastewater and dilution water is used to calculate the BOD parameter.

• True continuous measurement
• Response time: 3 to 15 minutes
• Measurement ranges of 20 - 1500 mg/liter BOD; 20 - 100,000 mg/liter BOD; 5 - 1500 mg/liter BOD
• Sample preparation with self-cleaning coarse filter
• Programmable concentration alarms
• Up to 14 days historical data can be recalled and displayed graphically
  

• Increase the efficiency of water/wastewater treatment to reduce process costs in both industrial and municipal applications.
• Provide warning of organic spills, to protect expensive processes and equipment in addition to monitoring for regulatory compliance.
  

List of articles - On-line BOD applications using BIOX-1010 analyser (organic monitoring)

• Sample preparation/bypass PA-2 or PA-3
• High concentration option
• Low concentration option
• Load calculation option (requires flowmeter input)
• Dual-stream option
• Nutrient dosing
• pH adjustment option
• Corrosive water option

BOD measurement

• Detection limit: 5 mg/liter BOD
• Range: 5 - 1500 mg/liter BOD (with low concentration option); 20 - 1500 mg/liter BOD (standard); 20 - 100,000 mg/liter BOD (with high concentration option)
  Reproducibility: 3%
• T90 time: 3 - 15 minutes

Physical Characteristics - Dimensions (WxHxD); Weight

• 645 x 1010 x 400 mm; 65 kg
• with PA-2 sample preparation: 757 x 1090 x 400 mm; 70 kg

Electrical and standards conformity

• Mains power: 230 VAC/50 Hz or 60Hz
• Average current: 2.0 A
• Maximum current: 3.0 A
• Enclosure: IP54 (per DIN 40050)
• Protection class: 1 (per IEC 1010)
  Immunity to voltage change: EN50022
• EMC emission: EN 50081-1, 12/96
• EMC noise immunity: EN 50082-2, 12/96
• Certification: CE Mark (Declaration of conformity)
• Test method: per DIN/VDE 0701

Data display, inputs and outputs

• Display: LCD graphics display, 16 lines by 40 characters, backlit
  Keypad: 21 key, 13 x 13 mm
• Data presentation: 6-hour graph (14-day scrollable); current value with 5-digit resolution
• Data storage: 10 days in RAM; 90 days with diskette drive (data interval 2 minutes)
• Monitoring: Logging of warnings, malfunctions, limit value alarms and calibrations for last 4 weeks (90 days with diskette drive), alerts for leakage, deficient wastewater, incorrect reactor temperature, incorrect oxygen reading, broken membrane on oxygen sensor
• Analog outputs: 0 - 20 mA or 4 - 20 mA selectable, electrically isolated load max 500 ohm
• Limit value alarms: Dry contact relay (normally closed) for high limit, low limit, and slope
• Diskette drive: PC-compatible 3.5" diskette drive for data storage
  Computer interface: RS 232C for data output and remote control