Krobio

Svinninge Renseanlæg er et kommunalt renseanlæg med en kapacitet på 4.500 PE beliggende i Holbæk Kommune nord for byen Svinninge. Anlægget ejes og drives af Fors A/S.

KROBIO HYBRID tager udgangspunkt i eksisterende renseanlæg. Anlægget er et aktiv slam-anlæg, som hovedsageligt modtager husholdningsspildevand samt spildevand fra enkelte industrier.

Anlægget er fra 1972 og har været overbelastet i forhold til den godkendte kapacitet. Svinninge Renseanlæg har udløb til recipienten Svinninge Å.

Anlæggets aktiv slam-proces er effektiv og har været relativt billig at etablere, men aktiv slam-processen er samtidig følsom over for varierende belastninger (Industri) og meget afhængig af at en god slamkvalitet opretholdes.

Efter flere scenarieanalyser, hvor også lukning og afskæring har været vendt, besluttede Fors A/S at udvide procesvolumen for det eksisterende renseanlæg og sikre, at anlægget kan tilpasses fremtidig tilledning, der kan have store udsving i forhold til den til enhver tid forekommende industriproduktion.

Den teknologiske nyhedsværdi i projektet er meget høj. AnoxKaldnes har udviklet en helt ny proces til biologisk vandrensning, CELLA^TM, som kombinerer aktiv slam processens fleksibilitet med biofilmsprocessernes kompakthed og stabilitet – i én og samme tank. Der har ikke tidligere været kommunikeret om teknologien og dens karakteristika. Denne nye procesløsning udspringer af Moving Bed Biofilm Reactor (MBBR) teknologien (biofilmsteknologi, hvor biofilm gror på specialdesignede plastbærere, som holdes i suspension i en reaktor –og ofte flere reaktorer for forskellige trin). AnoxKaldnes har lang erfaring med MBBR, både i forhold til design og til salg globalt. Til forskel fra den konventionelle MBBR-teknologi, baseres bære/støttematerialet i CELLA-teknologien på et biobaseret materiale. Derudover samler processen fordele fra Aktiv Slam, MBBR og aerobe granuler i én og samme proces – og i samme tank. CELLA-processen er meget kompakt og modstandsdygtig overfor variationer i flow og temperatur. Den har desuden kort opstartstid, lavt energiforbrug, højt metanudbytte og bringer kompakte teknologier til slamseparering i spil.

Konkret vil CELLA-teknologien blive demonstreret i fuld skala og i reelt driftsmiljø i samspil med eksisterende renseanlæg. Fra pilot forsøg kendes CELLA-teknologiens karakteristik og performance, men i projektet skal forskellige afprøvninger afklare nærmere, hvordan den optimale konfiguration etableres:

2 tanke parallelt som ”roughing” forud for aktiv slam-proces

ELLER

2 tanke i serie (højt/lavt belastet) for at se om CELLA-processen kan medvirke til at komme længere ned end gældende udledningstilladelse

For at optimere procesvolumen og samspil med oplandet, skal der etableres en avanceret afløbsmodel, der kan kopbles til renseanlæggets styring og bl.a. optimere fordelingen mellem CELLA-proces og Aktiv-Slam proces, afhængigt af flow, temperatur og årstid, stofbelastning, tilstand i recipienten, energi til rådighed etc. Samspillet skal sikre at aflastningerne fra oplandet til Svinninge Renseanlæg mindskes med mindst 25 %.

Projekt er opstartet som et partnerskab mellem Miljøstyrelsen, Fors A/S, AnoxKaldnes AB og Krüger A/S. Projektet har til formål, at eftervise den nyudviklede CELLA^TM-teknologi i fuldskala, som den første fuldskala eftervisning i verden.

Projektet, KROBIO HYBRID, er støttet af Miljøteknologisk Udviklings- og demonstrationsprogram, MUDP, som er et program under Miljøministeriet, der støtter udvikling, test og demonstration af miljøteknologier.

MUDP investerer i udvikling af fremtidens miljøteknologier til gavn for klima og miljø i Danmark og globalt, samtidig med at dansk vækst og beskæftigelse styrkes. Programmet understøtter dels den brede miljødagsorden, herunder rent vand, ren luft og sikker kemi, men understøtter og regeringens målsætning inden for klima, biodiversitet og cirkulær økonomi.

Svinninge Renseanlæg is a municipal wastewater treatment plant with a capacity of 4,500 PE located in Holbæk Municipality north of the town of Svinninge. The plant is owned and operated by Fors A/S.

KROBIO HYBRID is based on an existing wastewater treatment plant. The plant is an Active Sludge plant, which mainly receives household wastewater and wastewater from a few industries.

The plant dates from 1972 and is overloaded in relation to its authorized capacity. Svinninge Renseanlæg has an outlet to the recipient Svinninge river.

The plant’s Active Sludge process is efficient and has been relatively cheap to establish, but the Active Sludge process is also sensitive to varying loads (Industry) and highly dependent on maintaining a good sludge quality.

After several scenario analyses, including closure and cut-off, Fors A/S has decided to expand the process volume for the existing treatment plant and ensure that the plant can be adapted to future feed, which can have large fluctuations in relation to the industrial production occurring at any given time.

The technological novelty value of the project is very high. AnoxKaldnes has developed a completely new process for biological water purification, CELLA^TM, which combines the flexibility of the activated sludge process with the compactness and stability of biofilm processes – in one and the same tank. The technology and its characteristics have not previously been communicated. This new process solution originates from the Moving Bed Biofilm Reactor (MBBR) technology (biofilm technology where biofilms grow on specially designed plastic carriers that are kept in suspension in a reactor – and often multiple reactors for different steps). AnoxKaldnes has extensive experience with MBBR, both in terms of design and sales globally. Unlike conventional MBBR technology, the carrier/support material in CELLA technology is based on a bio-based material.

In addition, the process brings together the benefits of activated sludge, MBBR and aerobic granules in one process – and in the same tank. The CELLA process is very compact and resistant to variations in flow and temperature. It also has a short start-up time, low energy consumption, high methane yield and brings compact technologies for sludge separation into play.

Specifically, the CELLA technology will be demonstrated at full scale and in a real operating environment in interaction with existing wastewater treatment plants. The characteristics and performance of the CELLA technology are known from pilot trials, but in the project, various tests will clarify how to establish the optimal configuration:

2 tanks in parallel as roughing prior to the activated sludge process

OR

2 tanks in series (high/low loaded) to see if the CELLA process can help to go beyond the current discharge authorization

To optimize the process volume and interaction with the catchment area, an advanced drainage model must be established that can be linked to the treatment plant’s control system and, among other things, optimize the distribution between the CELLA process and the activated sludge process, depending on flow, temperature and season, substance load, condition in the recipient, available energy, etc. The interaction must ensure that the discharge from the catchment area to Svinninge Wastewater Treatment Plant is minimized by at least 25%.

• Demonstrate flexible and agile/mobile plant design to reduce capital investment, ease depreciation burden and allow for better reconfiguration for future needs
• Reduce site footprint by at least 50%, ensuring that centralisation can take place on existing sites and eliminating the very high cost of new trunk lines
• Create the basis for future wastewater treatment to be so compact that it takes place in closed/covered units so that nitrous oxide and methane, odour and noise are removed in a controlled manner
• Demonstrate the efficiency/robustness of the combination of an activated sludge plant and a biofilm plant to more easily absorb varying loads
• Reduce operating costs and increase energy production with more gas yield from the sludge
• Insight into climate impact from nitrous oxide emission
• Insight into the biofilm plant’s ability to remove persistent compounds (Several trials with biological treatment of persistent substances such as pharmaceutical residues and other pollutants have shown good results with biofilm technology (MBBR))
• Establish a real alternative to existing plastic-based carrier body production (Internationally and in industry, all MBBR plants today are exclusively based on fossil plastic carrier bodies)
• Establish interaction between treatment plants and runoff from the sewerage system (community sewer) to reduce overflows by at least 25%.

The project is initiated as a partnership between the Danish Environmental Protection Agency, Fors A/S, AnoxKaldnes AB and Krüger A/S. The project aims to demonstrate the newly developed CELLATM technology in full scale, as the first full-scale demonstration in the world.

The project, KROBIO HYBRID, is supported by the Danish Environmental Technology Development and Demonstration Programme, MUDP, which is a programme under the Danish Ministry of the Environment that supports the development, testing and demonstration of environmental technologies.

MUDP invests in the development of future environmental technologies to benefit the climate and environment in Denmark and globally, while strengthening Danish growth and employment. The programme supports the broad environmental agenda, including clean water, clean air and safe chemistry, but also supports the government’s objectives within climate, biodiversity and circular economy.