Wastewaster Treatmant plants (WWTPs) are among the largest municipal energy consumers.
Therefore, saving energy becomes more and more important
The German federation for water management, wastewater and waste (DWA)..
introduced guideline DWA-A 216
It provides plant operators with two tools, to assess the energy efficiency of WWTPs:
Energy Check and Energy Analysis.
To develop a European universal assessment method, 9 Universities, plant operators and SMEs
from Spain, Germany, Italy and Great Britain
have joined together in the EU Horizon2020 project: ENERWATER
Germany is represented by the Technical University of Cologne
and Aggerverband from Gummersbach
ENERWATER: the practical implementation at Aggerverband
Aggerverband provides all necessary measures around drinking water and wastewater.
It participates in the project with 20 of their plants
Using the example of the plant "Schönenthal" with 20.000 PE
it is explained how this is done.
To assess a WWTP with the ENERWATER method, a plant is divided in 7 treatment stages
preliminary treatment
primary treatment
secondary treatment
tertiary treatment
sludge treatment
odour treatment
return liquours treatment
Not every plant has all stages
The plant Schönenthal does not have a tertiary treatment...
nor are there any returning liqours that are treated separately.
Therefore, these stages are not assessed.
The energy consumption of every treatment stage is measured separately.
This is done with current transformers and energy meters.
They are installed in the control cabinets, or directly at the electricity consumer.
Large consumers have their own measurement.
For example: the blowers for aeration...
as well as these powerful screw pumps.
Smaller consumers, like these ventilators for odour treatment
can be measured together with other small consumers of this stage.
The goal is to measure 90% of the total energy consumption...
and get the total consumption for each treatment stage.
In Schönenthal the following stages are assessed:
preliminary treatment
primary treatment
secondary treatment
sludge treatment
and odour treament
All data are gathered in the operator room and made available in intranet.
To assess the energy efficiency of a treatment stage,
electricity consumption has to be brought together with treatment performance.
To determine and monitor treatment perfomance, samples are taken and analysed.
Samples can be taken manually at fixed frequencies...
or automatically with automated samplers, like here at the influent of the plant.
If and where additional samples have to be taken is explained on the project website: enerwater.eu
The sample are analysed according to common standards
For example: the Chemical Oxygen Demand (COD) is determined with a cuvette test.
To assess the efficiency of the plant with the ENERWATER methodology,
electrical and chemical results will be brought together in an online form.
An automatic calculation takes place.
Output is an efficiency index for each treatment stage.
Ultimatively, an index with corresponding label for the whole plant is calculated.
The final result is an energy label, which can be easily understood by anyone.
Energy data is measured in real time in Schönenthal.
This allows for a label calculation for any time span.
CEO of Aggerverband: with ENERWATER we hope to save even more energy.
We can look at a plant with a higher level of detail
and investigate and monitor the exact componens that are most relevant for energy consumption.
Ultimatively we hope to achieve a further reduction of costs...
and to improve the CO2 balance of our plants even further.
With the online available guide, the ENERWATER methodology can be implemented fairly easily.
It offers plant operators apprehensible performance indicators...
and makes it possible to compare different plant concepts throughout Europe.
Energy saving potential can be identified and -after implementation- easily evaluated.
Aggerverband and ENERWATER, already a great team!
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