P R O J E C T D E S C R I P T I O NHARTEVATN WWTP | BYKLE COUNCIL

Bykle Council made a decision to build a complete new treatment plant at the southern end of the Harte Lake (Hartevatn). The plant is an innovation both in its architecture and its technical design.

The processing plant is housed in an open industrial building about 790 m² with separate rooms for sludge removal, blowers and ventilators. The building is equipped with a 3.2 tonnes overhead crane that serves the whole plant, making operation much easier.

All the treatment processes are carried out in tanks located at the lower level of the hall. The Kaldnes™ MBBR and gravity thickeners are mounted in six identical 100m³ steel tanks. The Actiflo® unit is located in a 60 m³, rectangular, concrete element tank. The steel tanks and the Actiflo® are connected via a grating walk-way three meters above floor level for easy access. The waste water is pumped in from the Hovden area in the north via a newly constructed pumping station located next to the existing Hovden Treatment Plant. The southern central region delivers its waste water to the plant via a series of pumping stations.

The scope of delivery for Krüger Kaldnes is divided into 2 separate contracts – a turnkey installation containing the biological and chemical treatment processes and a contract for the delivery of pre-treatment and dewatering mechanical equipment. The two contracts complement each other such that together they form the complete process and equipment delivery from inlet to outlet.

Client: Bykle Council

Consulting Engineer: Norconsult AS, Sandvika

Contractor: Sweco Norge AS, Seljord

Objective: To build a treatment plant that caters for large seasonal variations in waste water flow and organic loads.

Solution: A combination of Kaldnes™ MBBR and Actiflo® in two separate lines to cope with the seasonal variations. The plant is built like as an industrial hall with four Kaldnes™MBBR-reactors and two gravitational thickeners in steel tanks on the floor. The Actiflo® units are delivered as pre-fabricated cement elements.

Design capacity: Qdim= 160 m³/h

Qmaksdim=320 m³/h

Organic load: 864 kg BOF5/d

Discharge spesification:BOF5: 25 mg/l or >70% purification

KOF : 125 mg/l or >75% purification

Tot P: >90% purificationg

The treatment plant of the future

Actiflo® outlet chute

HUBER RoS3 dewatering

Actiflo® sand recirculation pumps

All processes take place in stainless

steel tanks

HUBER Ro9 inlet sieve

Air regulating valves for Kaldnes™ MBBR

Polymer machines with big-bag holder

v The plant is designed for organic loads up to 14,400 PE and a hydraulic load (Qmaksdim) of 320 m3/h. The plant is equipped with two identical process lines.

v The biological treatment stage is based on the Kaldnes™ MBBR process consisting of four reactors. Chemical treatment is a prefabricated concrete Actiflo® and two gravitational thickeners for concentrating the sludge separated by the hydro cyclones in the Actiflo®.

v Pre-treatment in two HUBER Ro9’s with 6 mm holes followed by two HUBER steel sand-traps. The Kaldnes™MBBR and the Actiflo® are built in two separate lines that can be operated separately or in parallel to provide maximum flexibility.

v Two HUBER RoS3 helical dewatering machines and a closed Micodan container system have been delivered for sludge storage.

Krüger Kaldneswww.krugerkaldnes.no | post@krugerkaldnes.nophone: +47 91 60 80 00 | NORWAY

HUBER HRSF sand traps

Actiflo inlet pipes

Inspection hatch