Energy Guidelines for Waste Water Treatment and Water Supply

www.aquabench.de

Energy Guidelines for Waste Water Treatment and Water Supply

Workshop on energy check KPI

June 24 & 25, 2014

Tunis, Tunisia

26.06.2014 / Seite 2 www.aquabench.de

aquabench is an water industry based management consultant

• 16 engineers and economists working

in Hamburg and Cologne, Germany

• Benchmarking is developed by the

German industry since 1996;

aquabench in 2003

• More than 800 participants

• aquabench online software used also

in French benchmarking

• Regional hub of European

Benchmarking Cooperation

• Member of IWA SG„Benchmarking

and performance assessment“ / ISO

TG “Benchmarking”

• Seven trainings for GIZ since 2010 /

Support of ACWUA TWG

“Benchmarking”

Hamburg

Cologne


1 Opening session

3 Energy check water supply

4 Energy analysis water supply

6 Energy check wastewater disposal

5 Benchmarking energy efficiency

2 Scope of KPI system for energy checks

7 Energy analysis wastewater disposal


Programme (1st day)

Time Subject

09:00 Opening session

09:30 Scope of KPI system for energy checks in MENA water sector

10:30 Coffee break

11:00 Energy check water supply (performance indicators)

12:30 Lunch break

14:00 Energy check water supply (data variables)

15:30 Coffee break

16:00 Energy analysis water supply

17:30 Closure


Programme (2nd day)

Time Subject

09:00 Opening session

09:30 Benchmarking energy efficiency

11:00 Coffee break

11:30 Energy check wastewater disposal (performance indicators)

13:00 Lunch break

14:30 Energy check wastewater disposal (data variables)

16:00 Coffee break

16:30 Energy analysis waste water disposal

17:30 Closure


The main objective of this workshop is to identify the key energy

efficiency related performance indicators in water supply and for

waste water disposal. We will work on the deliverables below.

Assessment level

Assessment aspects

Scope energy check

Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines

Energy check

Main energy consumers water supply

Main energy consumers wastewater disposal

Energy analysis

Database and best practice

Ideas how to get started

Set of context information

Bench-marking


Lets get together!

What expectations do you have for the upcoming two days?


1 Opening session








We will develop a mutual understanding about the scope of the

energy check and the energy benchmarking.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


Three methodological terms need to be clarified. They can be

distinguished by their different objectives.

• rough estimation of the energy efficiency by focusing on the relevant energy consuming aggregates

• seasonally

Energy check

• more detailed energy efficiency monitoring by focusing on main business process

• learning and adapting methods for best-practices from partner utilities

• annually

Energy benchmarking

• detailed energy efficiency study by establishing an energy balance

• evaluation of energy performance

• establish energy efficiency actions

• when needed

Energy analysis


Both, the assessment level and the scope cover different areas.

level

utility

process

plant

aggre-gates

aspects

consum-ption

cost

product-ion

recovery

sources

reliabilty


To get an idea about the possible scope see example of energy

efficiency KPI from a German bulk water supplier below.

Specific energy consumption per main business process

• total energy consumption per authorised consumption

• energy consumption

• water abstraction per m³ authorised

• water treatment per m³ authorised

• water transmission per m³ authorised

• water storage per m³ authorised

• support process per m³ authorised

Specific energy consumption main energy consumers

• energy consumption horizontal filter well per m³ abstracted

• energy consumption treatment plant per m³ raw water

• energy consumption main pumping station per m³ produced

• energy consumption booster pumps 1/2 per m³ pumped

• energy consumption low voltage busbar + main pumping station per m³ produced

• total gross CO2 emission

Specific energy production from energy recovery

• energy recovery turbine 1/2/3 per m³ at storage tank inlet 1/2/3

27 data variables, annually collected, main data sources are SCADA system and the bills from the energy supplier.


The scope of the energy KPI used is on all levels of the utility but they

deal only with energy consumption and energy recovery.

level

utility

process

plant

aggre-gates

aspects

consum-ption

cost

product-ion

recovery

energy sources

reliabilty


1 Opening session








The main objective in this session is to develop a set of water supply

related energy KPI’s to be included in either energy check or

benchmarking methodology of the guidelines.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


The set of proposed KPI‘s covers all levels and aspects of energy

discussed – but it is not complete.

• “Supermarket” of performance indicators.

• Let’s “shop” those that appeal relevant to you for a consideration in energy check and

energy benchmarking for water supply!


For further preparation of the energy guidelines two questions

need to be discussed.

• Where do you see an implementation barrier?

• Please provide feedback on clue cards.

• Where do you see a need for definitions?


We see a need in defining clear process boundaries within the

water supply value added chain.

Taken from DVGW Wasser-Information 77 (2010), DVGW, DBU, Bonn und Osnabrück

Water abstraction

Water treatment

Clean water storage Main

pumping

station

Drinking

water

storage

tanks

Customers

Water transmission and distribution

Booster stations

Water works facility

Drinking water production


To have a sound foundation for energy checks, the data below

should be considered to collect on a regular basis.


1 Opening session








In the upcoming minutes we will determine the relevant energy

consumers in MENA water supply sector to be considered for the

energy balance of the energy analysis in the guidelines.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


What energy consuming aggregates should be included to

establish the energy balance for the energy analysis?

Please check list for water supply!


Brunnenkopf (BK)

30 mNN

2,9 bar

WG 16,8 kWh

WG 11,2 kWh

Eingang Wasserwerk (EWW)

35 mNN

2 bar

Wasseraufbereitung

10 kWh

WA 10 kWh

Ohne Aufteilung

Mit Aufteilung

6 bar

75 m³/h

16,8 kWh

Betriebswasserspiegel Brunnen (betrWSP)

0 mNN

WA 15,6 kWh

Energy balance without allocating a proportion of well pumps to

treatment:

• water abstraction: 16,8 kWh

• water treatment: 10 kWh

Energy balance with allocation:

• water abstraction

• water treatment

Only a proportion of the energy consumed by the well pumps is

utilised for water abstraction. This needs to be considered for the

energy balance.

kWh

kWh

mbarmmbar

barkWh

1,11

)34,01(8,16

))/0980665,0)030(9,2(

21(8,16

Operating water level

0 m.a.s.l.

75 m³/h

16,8 kWh

Well head

30 m.a.s.l.

2,9 bar

Raw water valve at intake

35 m.a.s.l.

2,0 bar

Water works

facility

10 kWh

kWh

kWhkWh

kWhmbarmmbar

barkWh

7,15

][10))34,0(8,16(

][10)))/0980665,0)030(9,2(

2(8,16(

Taken from aquabench benchmarking methodology


1 Opening session








Now the link between the energy check and an MENA water sector

energy efficiency benchmarking needs to be established.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


A sound database of energy related reference values is a major reason

to introduce an MENA water sector energy benchmarking initiative.

Taken from DWA (2013), DWA-A 216, Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V., Hennef, Germany

Distribution

of values

(%)


Benchmarking is a management tool focused on adaptation of

good practices

‘Benchmarking is the systematic and continuous process for the identification of becoming

acquainted with and adaptation of successful instruments, methods and processes from

benchmarking partners identified as being better.’ (DWA, DVGW 2008)

‘Benchmarking is a tool for performance improvement through systematic search and

adaptation of leading practices.’ (IWA 2011)

Source: DVGW/DWA “Benchmarking in Water Supply and Wastewater Supply” / IWA “Benchmarking Water Services”


Besides the data base aspect , also learning from best practices is

an argument for an energy efficiency benchmarking.

non-quantifiable action

analysis:

quantifiable Action

non-modifiable proportion

… due to operating environment

theoretic

area for

improve-

ment

best-practice own

position prospective

Value

implement

actions

performance

assessment

performance

improvement

stakeholder

communication Source: DVGW/DWA “Benchmarking in Water Supply and Wastewater Supply” / IWA “Benchmarking Water Services”


A typical benchmarking workshop by aquabench


Action proposal 10

„Analyze Investment – Cost of Relining < DN 1200“

Initial:

Our cost/meter of relining are 250% above average

Goal:

Find reasons for high costs and develop action proposals

Effect on KPI:

[KBK345] Cost Sewage construction [€ / m]

Describe action proposal:

Contact regional benchmarkinng partner and research on

quality standard, way of tender process, involved external

firms

Date:

I. Quartal 2011

Contact person

Thomas xxx

Tel.: (099) 9998-99900

Email: [email protected]

Action proposals are a result of benchmarking


More than 400 action proposals within seven years

> 400

action

proposals

Project No. of

participants Optimising areas

No. of action

proposals

Analysis 14

Investigation scope; sampling efficiency ;automation; work

load laboratories; procedures; outsourcing; quality

assurance

37

Indirect

discharger 17

Strategy (activities and frequencies); efficiency of

sampling and laboratories, staff qualification, price and

charges models

39

Sewer

operation 23

Camera and flushing technology; work time models; crew

strengths, cleaning intervals; vehicles and outside

management; work preparation and operational

management systems

92

Sewer pumping

stations 20

Modifications cleaning techniques; modifications cleaning

and inspection intervals; differentiation of inspection

activities; optimising of remote actions and energy

consumption

72

WWTPs 24

Per sub-process: investments in plant technology;

maintenance intervals; control systems; use of materials;

controlling; insourcing

over 200

Sewer

construction 13

Time recording software ;reduction of throughput times,

improvement of cost determination; coordination with

other service providers; standards of raw material;

manholes, shoring; award of contract practice

19

Material

management 12

Contract specifications; forecasts of market development,

modifications building cleaning; introduction of E-

procurement, , centralization, condition analysis toner; tie-

up of capital in stock

24


Project Planning

Orientation, Training &

Project Control

Data Acquisition & Validation

Data Analysis & Assessment

Reporting

Improvement Actions

Review of Improvement

Actions

Preparation Performance Assessment Performance Improvement

Taken from IWA (2011)

Steps of benchmarking are well defined, supporting tools and

knowledge is in the region available

• Manuals on benchmarking have been

published in Germany (2005) and on

international level (2011)

• Various regional „benchmarking“ approaches

exist in MENA region

• Softwaretool for benchmarking is available

• ACWUA Benchmarking Technical Working

Group consolidates all “know –how” for the

MENA region


Project Planning


Project Control



Reporting

Improvement Actions


Actions



.... but how to get started?

• Assessment system needs to be refined:

• Add more performance indicator to the

system

• Adress the question of context

information

• Clarify project organization

• Will ACWUA organize project?

• When? Who will participate?

• ...


A single PI can be very misleading if you are lacking

additional information ….


For a sound benchmarking context information should be

integrated to the energy performance indicator system.

“The interpretation of the performance of an undertaking cannot be carried out without taking into account the context in which it operates.”

Taken from Matos et al. (2003), Performance indicators for wastewater services, IWA publishing, London 2003


Transparency is one reason to include context information.

A B

A B

Body fat in % 8 30

Hair colour black brown

Weekly sports

activity in hours 80 0


The major reason to include context information is that they allow for

comparison within defined peer groups.

Cluster body fat < 10% Cluster body fat > 25%


Project Planning


Project Control



Reporting

Improvement Actions


Actions



.... but how to get started?

• Assessment system needs to be refined:

• Add more performance indicator to the

system

• Adress the question of context

information

• Clarify project organization

• Will ACWUA organize project?

• When? Who will participate?

• ...


Next step?

• Include idea of benchmarking in guidelines

• Clarify with ACWUA how to coordinate next steps (Workshop)


What would be relevant context information for water supply?


1 Opening session








The main objective in this session is to develop a set of wastewater

disposal related energy KPI’s to be included in either energy check

or benchmarking methodology of the guidelines.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


The set of proposed KPI‘s covers all levels and aspects of energy

discussed – but it is not complete.

• “Supermarket” of performance indicators.

• Let’s “shop” those that appeal relevant to you for a consideration in energy check and

energy benchmarking for waste water disposal!


For further preparation of the energy guidelines two questions

need to be discussed.

• Where do you see an implementation barrier?

• Please provide feedback on clue cards.

• Where do you see a need for definitions?


To have a sound foundation for energy checks, the data below should

be considered to collect on a regular basis for each WWTP.

• total plant

• aeration of activated sludge tank

• stirrer of activated sludge tanks

• pumps in water path

• pumps in sludge path

Energy consumption

• pollution load at plant intake

• ≥ 1 sample per month

• values have to be adjusted to each country

• if not measured at plant intake also back load due to dewatering sludge

Pollution load

• pumps in water path

• head

• volume

• pumps in sludge path

• head

• volume

Pumps


1 Opening session








In the upcoming minutes we will determine the relevant energy

consumers in MENA wastewater disposal sector to be considered for

the energy balance of the energy analysis in the guidelines.

Assessment level

Assessment aspects

Scope energy check


Energy check



Energy analysis




Bench-marking


What energy consuming aggregates should be included to

establish the energy balance for the energy analysis?

Please check list for wastewater disposal!

Documents

Energy Guidelines for Waste Water Treatment and Water Supply