notes for design, construction and operation of waste

Balkans Joint Conference and Exhibition, Tirana 7-9 November 2018

Notes for Design, Construction and Operation of Waste Water Treatment Plants

in Albania Prof. Dr.-eng. Jens Nowak

University of Applied Sciences PotsdamAKUT Umweltschutz Ingenieure Burkard und

Partner, BerlinTirana, November 2018


Design of a waste water treatment plant:

questions: for how much population equivalents (p.e.)

expansion stages!

which technology

ensuring a stable power supply

what happens with the sludge


Possiblesavings ofcosts

executionProject planningGeneral development andconcept planning

Single projectsTotal aerea


Selection of the basic form of wastewater disposal

Which towns/villages are to be developed and how

Where should which sewage treatment plants be built?

How should the resulting sludge be treated?


Centralized system

On-site treatmentSemi-centralized

system

Combined on-site and centralized

system

6

1.000 p.e

8 m sewer/p.e.150 p.e.

15 m sewer/p.e.

3 p.e50 m sewer/p.e.

more than10 m Kanal per p.e. or 30 m per property necessary→ no sewer, separate smallwwtps on site


60 m

100 mmain sewer

long distances

Problems:- costs- depth because of thenecessary slope of sewer

houseconnection


30 40 50 60 70 80 90 100

Anschlussgrad [%]

spez

ifisc

he K

oste

n [€

/E]

Cut costs

Target- connectiondegree


30 40 50 60 70 80 90 100

Anschlussgrad [%]

spez

ifisc

he K

oste

n [€

/E]

Target- connectiondegree

socially acceptable costs


40.000 E

3.000 p.e.

2.000 p.e.

8.000 p.e.

wwtp

8.000 m

16.000 m

2.000 m

1 m/ p.e.

5,3 m/ p.e.

1 m/ p.e. distance > 10 m/ p.e.

always separate wwtpfavorable

distance < 1 m/ E

always separate wwtpunfavorable

eventual wwtp


Errect sewage system?

Average groundslope?

Building ground?Space?

Profitability?Specfic sewagelength < 30 m/

property or10 m/p.e.

Waste water treatment on the property

Small sewage works

drainless pit

Errect semi-centrale wwtp‘s?

Receiving wateravailable?


Profitability?



Errect district-wwtp?



Profitability?

Transition to a central wwtp?

wwtp exists/ underconstruction/

planned ? capacity?

Profitability?(distance)

yes noyes no

yes no

yes no

yes no

yes no

yes no

yes no

yes no


Size of the wwtp

Number of inhabitants * target connection degree

+ (realistic increase of population ???)

+ Population equivalents for tourism, industry, trades


Technical design of the wwtp

Treatment technology depends on size and boundaryconditions (receiving water, ...), as similar as possible

minimum two parallel treatment lines(totaly separately opreable, that means also the aerationsystem)

with significant tourism: four parallel treatment lines(totaly separately opreable, that means also the aerationsystem)


Technical design of the wwtp

Fine screen 3 mm

corrosion-resistant equipment (no galvanized steel)

separate regulation of oxygen supply for eachtreatment line (for activated sludge systems)

...


Screenings in different parts of wwtp

Aeratoion grid after one year of operation


Operation of the WWTP

Technical documentation in Albanian language

Maintenance, service and repair of technicalequipement

Maintenance specifications and storage system

Information exchange „WWTP-neighbourhoods“


Thanks for your attention

notes for design, construction and operation of waste

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