Dbo Biologico

Solo disponible en BuenasTareas
  • Páginas : 14 (3437 palabras )
  • Descarga(s) : 0
  • Publicado : 10 de diciembre de 2012
Leer documento completo
Vista previa del texto

BOD measurements Respiration
Biological Oxygen Demand
BOD measurement according to EN 1899-1 and EN 1899-2 and for self-checks
Biological Oxygen Demand (BOD) is an important parameter in water resource management. BOD is a parameter used to measure the quality of water and treatment results in wastewater. In addition, BOD analysis potential is used inthe planning and design wastewater treatment facilities. In routine use BOD determination is used to check the wastewater in the inflow and discharge of wastewater treatment plants. Depending on the measurement site and type of wastewater the BOD value can lie between a few mg/l and several thousand mg/l. Several methods are available for carrying out the measurement.

BOD measurement

WTWoffers various measuring systems for these methods.
In “dilution BOD” the oxygen content of a sample is measured with an oxygen sensor before and after an incubation period of 5 days. The difference between the measurements is the BOD5 value; this is the official EPA method. In “BOD self-checks” with the respirometer the reduction in oxygen causes a definite pressure difference which can be measuredby a pressure sensor. This method is very easy to carry out and is a practical method. Also both methods are very different, the measurements correlate for discharge analysis in municipal wastewater treatment facilities. Both methods requires the samples to be kept at 68 °F (20 °C) for 5 days. WTW offers a wide range of themperature controlled incubators.

In the course ofgrowing environmental consciousness, microbiological degradability tests have become increasingly important. These can be, for example, soil surveys from waste sites or environmental impact surveys for new chemical substances. The necessary respiration measurements for anaerobic or aerobic degradation can be easily carried out using the OxiTop®-C systems with excellent analysis. WTW offers a widerange of application specific packages with appropriate sample vessels. User reports and application reports on this topic can be obtained from the WTW homepage (www.wtw.com).



“Dilution BOD”
Oxi 197i

- with inoLab® BSB/BOD 740
with easy-to-use analysis program, with PC control.

see p. 60

Recommended electrode: self-stirring oxygen sensor StirrOx®G
inoLab® BSB/BOD 740 with StirrOx® G Oxygen (D.O.)

“BOD self-check measurement”
practical method according to the self-check regulations - OxiTop®
Simple routine measurement, mercury-free pressure measurement

see p. 64

- OxiTop® Control
OxiTop® Control

see p. 65

Routine, standard and special measurement, with automatic sample management

OxiTop® IS 12

Depletion/RespirationOxiTop® Control OC 110 for special measurements
- Respiration - Biogas determination - Soil respiration - Biodegradability

see p. 66/70

Biogas determination

Upgrading and general Accessories
Soil respiration

see p. 68 see p. 74

Incubators/Thermostat Cabinets

Software/ Printers

Colony Counter



BOD/ RespirationMultiparameter



- with ProfiLine Oxi 197i

see p. 61


according to EN 1899-1 and EN 1899-2




BOD measurements
„Dilution BOD“

BOD measurement

according to DIN EN 1899-1 and DIN EN 1899-2

Simple sample management Automatic BOD calculation EPA approved

With inoLab® BSB/BOD 740
flexible andpowerful
This laboratory oxygen meter has been specially developed for BODn measurements. BOD measurements are determined by regulation EN 1899-1 and is EPA approved. You can store up to 7 of your own routines for frequently occurring dilution ratios. A maximum of 30 measuring samples each with 18 dilutions allow the management of up to 540 diluted samples. The inoLab® BSB/BOD 740 can also be...