Welcome to the Waste Water Treatment Plant of the City of ... de... · Welcome to the Waste Water Treatment Plant of the City of Augsburg Organisation - Facts - Figures Dipl.-Ing.

Welcome to the

Waste Water Treatment Plant

of the City of Augsburg

Organisation - Facts - Figures

Dipl.-Ing. Klaus Stegmayer, Plant Manager

WWTP Augsburg - Organisation Chart 1

Construction Department

Civil Department (Roads, Bridges, Traffic, etc.)

Stadtentwässerung Augsburg

(Waste Water Management Authority)

- Sewer Network Subdept. (~ 85 Employees)

- WWTP Subdept. (~ 105 Employees)

- Administration Subdept. (~ 10 Employees)

Augsburg City Mayor

WWTP Augsburg - Organisation Chart 2

Laboratory

Industry Supervision

WWTP and Industry Analytics

WWTP Online Measuring

Operation and Maintenance

Waste Water and Sludge Operation

Sludge Dewatering Operation

Sewer Structures Operation Maintenance

Mechanical Maintenance

Electrical Maintenance

Process Control Maintenance

IT / Controlling

Infrastructure

Apprentices Training

Inhouse Consulting

Civil Engineering

Mechanical Engineering

Electrical Engineering

Management

Administration and Main Office

WWTP Augsburg - Legal Structure

Stadtentwässerung Augsburg

legal form "EIGENBETRIEB"

- 100 % municipally owned (no private shareholder or investor)

- separate budget (independent from the city household)

- revenues result from wastewater fees (paid by every system user)

- all expenses are paid evenly from these fees (no profit or loss is allowed)

WWTP Augsburg - Fees and Finances Structure 1

household budgeting ~ 3 years in advance

calculation of fees incl. risk factor

observation of cost development in 3 years

bylaw allows no profits or losses

new calculation with lower/equal/higher fees

control by comparison (benchmarking)

Fee Evaluation Circle:

WWTP Augsburg - Fees and Finances Structure 2

Property owners pay for introduced

precipitation water into the combined

sewer system 0,71 € per square meter

of sealed ground annually

Actual Fee Situation:

Inhabitants and industry pay for

consumed fresh water 1,41 € per

cubic meter (plus ~ 2 € fresh water fees)

WWTP Augsburg - Discharge Situation

Indirect Dischargers

= Households and Industry Connected to our Sewer network

Own pretreatment mandatory if our bylaw values are exceeded:

(<35°C, pH 6-11, low solids, no dilution, no blocking/poison/explosive/smelly/

aggressive/infectuous/radioactive, e.g. no waste, manure, mineral oil, leachate,

slaughterhouse, salts, acids-bases, heavy metals, colorants, coolants, ....)

Supervision by us (and of us by the water authorities)

Direct Dischargers

= Mainly Large Industry (not in Augsburg)

Independent WWTP with discharge directly into waters

Own operational rights and direct supervision by water authorities

WWTP Augsburg - Catchment Area

- 640 km of sewer network

- combined sewer system

- mainly free flow S->N

- maximum flow time 6 h

WWTP Augsburg - Aerial View

WWTP Augsburg - History

- initiation of the contemporary sewer network 1910

- WWTP initiation 1957, since then continuous growth and improvement

- biological treatment stage, nutrient removal, sludge fermentation, ...

- today fourth largest WWTP in Bavaria (after Munich 1/2 and Nuremberg)

- ISO 9001 (quality), ISO 14001 (environment) and ISO 18001 (safety) certified

History:

WWTP Augsburg - Dimensions

- 50 Mio. m³ treated waste water per year

- average annual load 600.000 people equivalent

- 50 % inhabitants, 50 % industry and commerce

- ¼ of the carbon load results from a paper mill

- 30.000 t annual waste sludge production with 32 % SS (-> incineration)

- 600 t rakings and 100 t grit chamber residues per year

Waste Water Treatment Figures Today:

WWTP Augsburg - Performance 1

Treatment Efficiency (Annual Average Values rounded):

Parameter Influent Effluent Legal Limit Elimination

BOD 220 mg/l 3 mg/l 15 mg/l 98 %

COD 455 mg/l 43 mg/l 75 mg/l 90 %

NH4 20 mg/l 0,9 mg/l 5 mg/l 95 %

total N 21 mg/l 4,2 mg/l 13 mg/l 79 %

total P 4,3 mg/l 0,3 mg/l 1 mg/l 93 %

WWTP Augsburg - Performance 2

Chronological Improvement of Elimination Rates (Annual Average Values)

WWTP Augsburg - Energy Supply 1

- WWTP are among the biggest single power consumers in a municipality

- up to 2/3 of the energy is used for sludge aerartion

- annual electricity consumption 15 GWh (<=> 4.000 average households)

- more than 100 % electricity and 100 % heat self-sufficient

- sources: 97% sludge+cosubstrate biogas, 2% hydropower, 1% photovoltaic

- nationwide objective 22 kWh/(inh.*a) already fulfilled

Waste Water Treatment and Energy Consumption:

WWTP Augsburg - Energy Supply 2

Energy Sources and Consumption Balance

WWTP Augsburg

Thank you for your attention

Your questions anytime (either now or during the visiting tour)