Dobrna, Slovenia

Dobrna, Slovenia, 2009

The Dobrna Wastewater Treatment Plant (WWTP) ensures preliminary mechanical and secondary biological treatment of sewage from 4000 Population Equivalents (P.E.). The raw sewage is collected from the area of DOBRNA and conveyed to the WWTP by a combined sewerage system.

WWTP consists of mechanical pre-treatment section, two sections for biological treatment – older one with capacity of 1 800 P.E. and one new designed and executed by Hydrotech with capacity of 2 200 P.E.. For separation of treated water and activation sludge new sedimentation tank was constructed with hydraulic capacity of 4 000 P.E.. Existing sludge holding tank is used for surplus sludge. The treated final effluent is conducted to the river.

For nutrients removal pre-denitrification and phosphorus precipitation processes are included in the biological treatment process.

Graph: Design (legislative requirements) and operational removal efficiencies parameters

Inlet

COD

TSS

Ntotal

Ptotal

Design parameters

400 mg/l

233 mg/l

37 mg/l

8,4 mg/l

Operational phase

390 mg/l

214 mg/l

37,4 mg/l

5,7 mg/l

Outlet

COD

TSS

Ntotal

Ptotal

Legislative requirements

75 mg/l

30 mg/l

15 mg/l

2 mg/l

Operational phase

20 mg/l

4 mg/l

2 mg/l

3,8 mg/l

Efficiency

COD

TSS

Ntotal

Ptotal

Legislative requirements

81,3 %

87,1 %

59,5 %

76,2 %

Operational phase

94,9 %

98,1 %

94,7 %

33,3 %

Removal Efficiency of COD(1), Total N(2), Total P(3), TSS(4)

Parameters

Project

Capacity:

4 000 PE

1 200 m3/d

Type of wastewater:

Municipal WWTP

Technology:

  • Mechanical pre-treatment: combined unit  for mechanical pre-treatment

  • Secondary treatment: Selector, denitrification, and nitrification tanks followed by secondary sedimentation tank

  • Phosphorus precipitation

References

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