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SOP for Operation and Cleaning of COD Digester

OBJECTIVE
To provide a procedure for the operation of the COD Digester.

SCOPE
This procedure is applicable to COD Digester at XYZ Ltd.

RESPONSIBILITY
Quality Control Chemist and above

ACCOUNTABILITY
Quality Control Head
PROCEDURE

Precaution
  • Ensure that the instrument is clean and free from dust.
  • Keep the instrument 1 foot away from the wall.
  • Keep the instrument away from the washbasin or any water source.
  • Ensure that any solvent/chemical does not fall on the aluminum block when it is hot.
  • Use asbestos gloves while handling the hot tubes.
  • Do not try to remove the tubes from the COD block and keep it in the tube stand.
  • Do not try to remove the condenser tube when it is hot.
  • Switch OFF the instrument when not in use.
  • Calibrate the digital timer controller and heating sensor of the COD Digester once a year by the approved outside agency.


Cleaning
  • Disconnect the instrument from the electrical connection.
  • Clean the instrument with a soft cloth.
  • Clean the tubes as per SOP of Cleaning of Laboratory Glassware.

Operation
  • Connect the instrument to the main supply. Switch on the main supply.
  • The red-colored bulb will glow indicating the power supply is connected.
  • The orange-colored bulb will glow indicating the heater is on.
  • The orange-colored bulb remains on till the temperature is attained and will get switched off when the desired temperature is attained.
  • Adjust the required temperature and time with the help of keys given on the digital control panel.
  • Press the SET key.
  • The display will show SP for temperature.
  • Set 150°C temperature with the help of the up and down key.
  • Again press the SET key.
  • Display will show soak time.
  • Set 2.0 Hours time with the help of up and down key.
  • In soak time parameter the digits before decimal are hours & after decimal it is minutes. i.e, (hh:mm)
  • Fill 30 ml of the content of sample in each tube and tightly close with condenser tube.
  • Place 30 ml filled tubes in the aluminum COD block of COD Digester for 2 hours.
  • After completing the cycle, digital alarm for 10 seconds will produce and heating will get automatically stopped.
  • Allow to cool at room temperature.
  • Perform further analysis as per Specification of Chemical Oxygen Demand.

ABBREVIATIONS
COD: Chemical oxygen demand
SPSet point
°CDegree Celsius
hh: mm
Hours: Minutes
%Percentage
mlMilliliter

ANNEXURES
Nil

REVISION HISTORY
Nil

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