Digital determination of BOD and Degradation tests

BOD (Biochemical Oxygen Demand) is an important parameter when measuring the quality of water bodies and the efficiency of water treatment plants by determining the degradation of carbons.
Using the official method of BOD5 the concentration of D.O. will be measured in diluted samples before and after incubation. When performing the “BOD self-check measurement” in a closed respirometer the absorption of the carbon leads to a gaugeable pressure change. In both cases the samples have to be incubated for 5 days at 20°C.
Up-to-date UV-VIS sensors for constant monitoring of WWTP effluents of municipal wastewater have the possibility to measure BOD as well. It is an indirect method using the spectral correlation between COD (chemical oxygen demand) and BOD (adjustment with known BOD values from laboratory measurements) to calculate the current BOD.
General tests on bio-degradation like soil respiration or bio-degradability of new chemicals can conveniently be carried out using OxiTop®-IDS systems.

Respirometric OxiTop® measuring system for BOD self check measurement with undiluted samples (DIN EN 1899 -2)

– Measuring ranges up to 4,000 mg/l BOD possible

– No need to convert data – direct input of sample volume

– Most reliable results – display of the curve at the head

– Full information – interim values always available

BOD instrument for self-check with 6 measuring units, with direct display of the BOD value at the measuring head, universal power supply 100 to 240 VAC, 50/60 Hz; accessories. 6 OxiTop®-i measuring heads (3 x blue and 3 x grey), menu-operated, with backlit graphic LCD, control LED, operating buttons, for direct BOD readings, volume pre-selection, measurement duration between 1 and 7 days selectable, display of measuring curve, display of current readings.