Nitrogen removal

The less the better. As with anything in life too much of something is bad and too much nitrogen in the recipient can cause danger to the ecosystems and human health. Thus, in response to a global increase in nitrogen contamination, many nations like Norway are tightening their regulatory standards for nitrogen compounds.

In Norway, the climate is of great importance when designing wastewater treatment plants. The temperature of the wastewater can become as low as 4-5°C in wintertime and the wastewater is quite dilute. In Norway the majorities of the nitrogen removal plants are based on the MBBR process. There are several reasons for this, though some of the main reasons are that the process has proved to be stable at low temperatures as well as compact and easily combined with different types of sludge separation systems.

Our engineers have a unique experience and knowhow in designing, constructing and operating nitrogen removal plants using various types of technologies.

Selected References WWTP

FARA WWTP

New state of the art treatment plant for Fredrikstad og Hvaler

Design Load

Qdim: 2170 m³/h
Qmax: 6600 m³/h
TN: 1500 kg/d
TP: 167 kg/d
BOD: 6200 Kg/d

Technologies

Pumping station
Pre-treatment
MBBR
Dissolved air flotation
CoMag system

Effluent Requirements

TN: 85% removal or 6 mg/l
TP: 95% removal or 0,2 mg/l
BOD: 80% removal or 25 mg/l

Project Data

Awarded: 2022
Completion: 2027

HIAS WWTP

New BIO-P removal Process

Design Load

PE:200 000 (2050)
Qmaxdim:1 800 m³/h
BOD:11 907 kg/d
TP: 230 kg/d

Technologies

Pre-treatment (existing)
HIAS Process
Flocculation
Disc filtration

Effluent Requirements

TP: 95% removal
BOD: 70% removal or 25 mg/l

Project Data

Awarded: 2018
Completion: 2020

UGRA WWTP

New State of the art treatment plant for Ullensaker Municipality

Design Load

PE: 125 000
Qmaxdim: 1 900 m³/h    
BOD: 7470 kg/d
TN: 1530 kg/d

Technologies

Pumping station
Pre-treatment
MBBR
Dissolved air flotation
Sand filtration

Effluent Requirements

TN: 70 %removal
TP: 98% removal
BOD: 70% removal or 25 mg/l

Project Data

Awarded: 2020
Completion: 2025