Foto: Per Westergård

Facility components

The pilot plant is basically divided into different aerobic and anaerobic pilot treatment lines that can run with "normal" wastewater, i.e. the same water that Stockholm's largest sewage treatment plants, Henriksdalsverket, receives, and concentrated wastewater from Hammarby Sjöstads duplicate sewer system. The lines have a varying capacity between 0.1-6 m³/h and have a common pretreatment by a grid separation. Inflows into pilot lines can be statistic or dynamic with the opportunity for own simulated flow variations or directly linked to the actual variations into Henriksdalsverket. All effluents (including sludge) are returned to the inlet of Henriksdalsverket, which implies no emission limitations affect the activities at Sjöstadsverket.

In addition to these fixed pilot lines, different mobile devices and purification steps can be connected to the various lines. This includes e.g. ozonation, UV, hydrogen peroxide and activated carbon, reverse osmosis, microfiltration, ultrafiltration, particle counter, online sensors, etc.

The different process steps from all pilot lines can be connected in any manner and for example pretreatment by settling can be replaced with drum filters, flotation etc. Moreover, since the 2014, a new control system based on UniView is installed for the various pilot lines.

Linje 1

(click the image for a higher resolution)

Pilot Line: Active Sludge/MembraneBioReactor
This pilot line is an exact copy of Henriksdalsverket, both now and in the future. In practice this means that the line is constructed as a bimodulart line. It can both run as a conventional modern Swedish STP, with pre-precipitation and sedimentation, 6 different steps for biological treatment, secondary sedimentation and sand filter with the possibility of precipitation. In this conventional mode, it can also be operated as a Bio-P facility. In addition to this, the pilot line can also run as a MembraneBioReactor (MBR) as Henriksdalsverket will look like in the future (see also ongoing projects). There is also the opportunity for internal sludge hydrolysis for different nitrogen removal modes.

Linje 4

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Pilot Line: Upflow Anaerobic Sludge Blanket
The UASB line is an anaerobic treatment of wastewater. The water can be pretreated with precipitation and either sedimentation or flotation. The UASB consists of two mixing chambers and two reactors with gas separation that can be operated in parallel or series, or combinations of these. For nutrient removal includes either a polishing step with nitrification/denitrification in MBBR and a drum filter or a deammonification.

Pilot Line: Deammonification
Sjöstadsverket has access to several deammonification pilots both for the treatment of supernatant and for mainstream treatment. Both one-stage MBBR or IFAS systems are available.

Pilot Line: REUSE
This pilot line consists of both secondary and tertiary treatment steps. A modified SBR activated sludge process with continuous inflow and without pretreatment is the main step. To this can then be connected (in any number and order), RGSF - Rapid Gravity sand filters, UV, Disk - Disk Filter, UF - Ultrafiltration (in various pressure variants and materials), ozonation, BAF - BioActive Filter, GAC, and chlorination. The system can run in any configuration (treatment trains) with respect to nitrogen and phosphorus and is probably Sweden's facility with most online sensors for process monitoring and control.

Pilot Line: ITEST
This pilot line consists of two identical purification lines in from the traditional nitrogen removal. The inflow to one of lines can be heated to the desired temperature and the setup allows for direct comparative tests.

Pilot Line: membrane distillation
The membrane distillation line consists of 10 modules that can be run in any combination at various temperatures for concentration of fluxes or production of ultra pure water. The line is connected to the district heating network, but also has its own heating and a closed system for liquid recirculation.

Pilot Line: Sludge Treatment
The sludge handling consists of thickener, a decanter centrifuge, sludge tanks and two digestion chamber and an upgrading plant (Biosling). The digesters with gas measurement allow to treat excess sludge from the different lines or to perform separate digestion experiments. There is access to a separate supply of black water and food waste.


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