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5. Operating notes
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5.3 Daily function check
Check that the wastewater treatment plant is running fault-free on a daily basis.
Caution:
Report any operating failure that occurs (for example, an error message from the
control unit) to the maintenance service immediately.
5.4 Monthly in-house inspection (as per German law)
The operator must have the inspection and maintenance work performed by a qualified
expert if he or she does not have the necessary expertise.
Note:
In Germany, a certificate of qualification is available from DWA e.V., the German
association for water, wastewater and waste (www.dwa.de).
“Qualified experts” are those persons engaged by the operator or contracted third
parties who are considered to have the training, knowledge and practical
experience qualifying them to carry out the inspection of small wastewater
treatment plants.
Follow the instructions in chapter “6.2 Monthly in-house inspection”.
5.5 Half-yearly maintenance (as per German law)
In accordance with the legal water usage permit, the operator must take out a maintenance
contract with a specialist company (qualified expert) that covers a fixed scope of work.
Maintenance is generally performed twice a year, in six month intervals.
5.6 Other maintenance recommendations
A small wastewater treatment plant is a stationary electrical system. Like all electrical
systems of this type, its safety should be tested every second year by an electrical technician
according to VDE 0701 and VDE 0702. Recommended checks are: the measurement of the
insulating resistance, protective earth conductor resistance and the replacement leakage
current.
5.7 Important documents for operation and maintenance
You must maintain an operations logbook for your small wastewater treatment plant.
A template for an operations logbook can be found on the last page of this document.
Failures, maintenance work, sludge removal, maintenance reports and other incidents should
be recorded in the operations logbook. The operations logbook is to be handed over to the
responsible authorities upon request.