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Verification and assessment of technologies for tertiary treatment of municipal wastewater

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Open days at WWTP Brno-Modřice

During September excursions for a broad public will be held at wastewater treatment Brno-Modřice. For more information and reservation see the website of Brněnské vodárny a kanalizace, a.s.

Project LIFE2Water

Water pollution represents a significant risk to water environment such as acute and chronic aquatic toxicity, accumulation in water ecosystems and loss of habitats and biodiversity as well as threads to public health. Wastewater treatment plants represent an important source of pollution. Organic pollution, nutrients, pathogenic organisms and other substances with negative effects on organisms are discharged with treated wastewater. Among the last ones, pharmaceuticals, personal care products, pesticides and other chemical substances used for industrial production can be mentioned. Removal of such pollution is complicated yet important to decrease the negative effects on aquatic ecosystems.

Project LIFE2Water aims to improve the quality of discharged effluents. The goal of the project is to implement innovative technologies for tertiary treatment of municipal wastewater with a significant potential for improvement of effluent quality and their verification on the pilot scale with the aim to contribute to the achievement of good ecological status of aquatic ecosystems. Within the project, three pilot plants will be designed and constructed: (1) pilot plant based on micro-strainer filtration in combination with UV radiation; (2) pilot plant for ozone sonolysis and (3) pilot ultrafiltration plant. Pilot plants will be placed to the municipal wastewater treatment plant for long-term testing, verification and optimization of technologies for tertiary treatment of municipal wastewater. Technologies will be evaluated from economic, environmental and operational perspective. A set of procedures for selection of the technology for tertiary treatment of municipal wastewater will be developed. This tool will support water companies and other water management experts in selection of an appropriate technology for tertiary treatment stages. Sub-goal of the project is to increase awareness among the target groups through selected dissemination activities. Firstly, the aim is to involve experts in the field of wastewater management, analytical and environmental chemistry to exchange knowledge, share experiences and to show examples of best practice for removal of hazardous substances and other pollution to the aquatic environments. Secondly, the aim is to involve general public to increase awareness about the need for elimination of water pollution and protection of aquatic environment.

Activities of the project

Project LIFE2Water aims to improve the quality of discharged effluents. Within the LIFE2Water project, innovative technologies for tertiary treatment of municipal wastewater with a significant potential for removal of microbial contamination and removal of selected industrial substances, pesticides and pharmaceuticals will be verified and assessed.

Due to relatively long period of time between preparation of the project proposal and start of the project relevant legislation in water management will be updated. Methodology for sampling of wastewater and methodology for determining concentration of selected priority substances will be prepared.

This action will be followed by actions focusing on the design and construction of the pilot plants. Pilot plant based on micro-strainer filtration in combination with, pilot plant for sonolysis of ozone and pilot ultrafiltration plant will be designed and constructed. They will be located at the wastewater treatment plant Brno-Modřice. Each of the plants will be tested for one year under various operating conditions (flow, load, seasonal differences). Depending on the operational conditions pilot plants will be optimised with the aim to reduce operating costs and to achieve required effluent quality in terms of selected priority substance removal and microbial contamination elimination. Consumption of electricity and other necessary inputs (e. g. consumption of oxygen and chemicals) will be monitored and measured. Wastewater samples will be regularly taken and analyzed using appropriate analytical methods. Basic and microbial parameters and concentration of selected priority substances will be monitored. Assessment and comparison of tested technologies in terms of economic, environmental and operational aspects will be prepared. A set of procedures for selection of the technology for tertiary treatment of municipal wastewater will be developed. The focus will be given to the environmental protection and economic sustainability.

Emphasis will be given to dissemination activities. The aim is to promote the project and its results, to exchange experiences and to show best practises examples. Dissemination activities will be focused on different target groups of the project. Website with information about the project, notice boards and leaflets for general public as well as experts will be created. Excursions to the wastewater treatment plant Brno-Modřice for general public as well as experts will be organised. The project results will be presented at conferences and in expert journals. Focus will be put on networking, exchanging information, sharing experiences and showing best practice examples with experts from water management.

Expected results

Expected results of the project are verification and assessment of selected technologies for tertiary treatment of municipal wastewater in a pilot scale. Selected technologies will be evaluated and compared in terms of pollutant removal efficiency, economic efficiency (investment and operating costs) and possible scale-up. A set of procedures for selection of the technology for tertiary treatment of municipal wastewater will be developed. Three pilot plants for tertiary treatment will be designed and constructed: (1) pilot plant based on micro-strainer filtration in combination with UV radiation; (2) pilot plant for ozone sonolysis and (3) pilot ultrafiltration plant. During the project implementation achievable removal efficiency and operating parameters will be tested, verified and assessed. Focus will be given to the decrease of consumption of electricity and other inputs.

Significant expected result will be the achievement of desired removal efficiency of the selected technologies at different operating conditions at wastewater treatment plant. Removal efficiency of the following pollutants will be monitored and assesed:

(1) Removal rate of monitored priority substances

  • Industrial pollutants (bisphenol A, nonylphenol and octylphenol and their metabolites)
  • Pesticies (atrazine and its metabolites, MCPA, MCPP, MCPB)
  • Pharmaceuticals (17α-ethinylestradiol, 17β-estradiol and their metabolites, diclofenac)

(2) Elimination of microbial contamination (Fecal coliform bacteria, Enterococci and Escherichia coli).

Important results of the project will be the involvement of target groups through dissemination activities. Important results will also involve support of implementation of the European legislation in the field of water management.

WWTP Brno-Modřice

WWTP Brno-Modřice

Pilot plants will be located at the municipal wastewater treatment plant in Brno-Modřice. The wastewater treatment plant in Modřice treats wastewater conveyed by a system of sanitary sewers from the city of Brno and by a system of pumping stations from the wide surroundings of Brno.

Raw wastewater is conveyed to the wastewater treatment plant (WWTP) via an inlet structure used as a flow split. Water coming to the WWTP is pre-treated and freed from coarse gravel in a gravel trap and then it passes mechanically scraped screens with slot width of 6 mm. Screenings from the screens are pressed and then flushed with water. Water flows from the screenings room by gravity to an aerated sand trap equipped with grease separation. The sand is further processed in a sand classifier and washer and then stored in a skip. Water coming from the gravel trap and the sand trap is conveyed by a channel to a screw pumping station. Water is pumped to a flow split dividing the flow into six primary clarifiers. The primary clarifiers ensure mechanical removal of settleable particles.

After the mechanical treatment, the wastewater is conveyed to an intermediate pumping station and it is further pumped into activation. The activation is divided into two lines, each with two separate lanes that can be operated separately or together. Water is first conveyed to the anaerobic tank (phosphorus removal), then to a circulatory anoxic serving for pre-denitrification. The last stage of activation is an anoxic part with fine-bubble aeration divided into aerated and unaerated zones. Return sludge from the secondary clarifiers is freed from nitrates by denitrification in the pre-anoxic zone located in the first part of the activation in order to achieve efficient phosphorus removal. Phosphorus removal ensured primarily by the biological process or by dosing ferric sulphate. The mixed liquor from the activation tanks is fed into six secondary clarifiers where activated sludge is settled and separated. Settled sludge is conveyed via a return sludge pumping station to the pre-anoxic zone of the activation. Activated excess sludge taken from the activation is processed in the sludge management.

Sludge management consists of a primary sludge thickener, flotation thickener for the biological sludge, mechanical screens, homogenisation tank, digesters, digested sludge storage tanks, sludge dewatering plant and sludge drier. Primary sludge from the primary clarifiers is thickened and mixed with the excess activated slubdge in the homogenisation tank. Mixed raw sludge is pumped to the digesters. Tenperature in the digestors is kept at 35°C. The sludge retention time in the digesters is about 22 days. Produced biogas is stored in two two diuble-membrane gas holders and is used for electricity and heat generation in cogeneration units. Before drying, digested sludge stored in storage tanks is dewatered in centrifuges. Dewatered sludge is dried in a paddle sludge drier. Long sludge retention time (over three hours) combined with the average sludge temperature of 100°C enables pasteurisation and sanitary treatment of sludge.

Project partners

COORDINATING BENEFICIARY

AQUA PROCON s.r.o.
Palackého tř. 12, 612 00 Brno
Czech Republic
www.aquaprocon.cz

ASSOCIATED BENEFICIARIES

Brněnské vodárny a kanalizace, a.s.
Hybešova 254/16, 657 33 Brno
Czech Republic
www.bvk.cz

ASSOCIATED BENEFICIARIES

ALS Czech Republic, s.r.o.
Na Harfě 336/9, 190 00 Praha 9
Czech Republic
www.alsglobal.cz

Activity

V přípravné etapě projektu bude vzhledem k relativně dlouhé době mezi přípravou návrhu projektu a počátkem vlastního řešení aktualizován přehled příslušné legislativy ve vodním hospodářství. Bude připravena metodika odběru vzorků odpadních vod a metodika stanovení koncentrací sledovaného znečištění průmyslovými látkami, pesticidy a jejich metabolity a léčivy. Poté budou následovat aktivity zaměřené na návrh a konstrukci pilotních jednotek. V rámci těchto aktivit budou postupně navrženy a zkonstruovány pilotní jednotky (B1 – pilotní jednotka mikrosítové filtrace s UV zářením a dávkováním peroxidu vodíku, B2 – pilotní jednotka sonolýzy ozonu, B3 – pilotní ultrafiltrační jednotka s adsorpcí na aktivní uhlí). Jednotky budou umístěny na čistírně odpadních vod Brno-Modřice. Každá z pilotních jednotek bude testována rok v poloprovozních podmínkách při různých provozních stavech (průtok, zatížení, roční období) (aktivity C1, C2 a C3). V závislosti na provozních stavech budou jednotky optimalizovány s cílem snižovat provozní náklady čištění a s cílem dosáhnout požadovaných parametrů na odtoku. Bude sledována a měřena spotřeba elektrické energie a dalších nezbytných vstupů (např. spotřeba kyslíku a chemikálií). V průběhu testování budou odebírány a vhodnými analytickými metodami analyzovány vzorky odpadních vod. Budou sledovány základní a mikrobiální parametry a koncentrace sledovaných průmyslových látek, pesticidů a jejich metabolitů a léčiv. V závěru testování každé z jednotek bude připraveno vyhodnocení a porovnání z ekonomického, environmentálního a provozního hlediska. Na základě dosažených výsledků bude v rámci aktivity C4 vytvořen souboru postupů k výběru vhodných technologií pro dočištění odpadní vody se zvláštním zaměřením na ochranu životního prostředí a ekonomickou udržitelnost. Důraz bude kladen na diseminační aktivity projektu s cílem propagovat projekt a jeho výsledky, výměnu zkušeností a přenos dobré praxe (aktivity D). Diseminační aktivity budou zaměřeny na jednotlivé cílové skupiny projektu. Z hlediska řízení projektu bude důležitou aktivitou management projektu (E1).

Dissemination

Overview of the current water management legislation with focus on reduction of chemical and microbial pollution
The report gives an overview of current European and national legislation in the field of water management with focus on elimination of chemical and microbiological pollution. Regarding the fact that the discharge limit for selected pollutants are not set by legislation, the limits have been set by the project team.
Report on sampling methods and methods for analytical determination of the selected chemical compounds
The report gives an overview of methods used form sampling in order to ensure representativeness of the samples. Furthermore, the report summarizes methods for analyses of selected parameters.
Documentation of the pilot plant of microsieves/UV radiation
The report describes pilot plant of microscreen/UV, its components and the actual design of the pilot plant. The report was used to manufacture and start-up of the pilot plant of microscreen filtration with UV radiation located at WWTP Brno-Modřice.
Documentation of the pilot plant for ozone sonolysis
The report describes pilot plant for ozone sonolysis, its components and the actual design of the pilot plant. The report was used to manufacture and start-up of the pilot plant of ozone sonolysis located at WWTP Brno-Modřice.
Documentation of the pilot ultrafiltration plant
The report describes a pilot ultrafiltration plant, its components and the actual design of the pilot plant. Based on the report, the pilot ultrafiltration plant was manufactured and put in the operation at WWTP Brno-Modřice.
Celkové vyhodnocení technologie mikrosítové filtrace s UV zářením a dávkováním peroxidu vodíku
Tato zpráva je souhrnem výstupů C1d1, C1d2 a C1d3 projektu LIFE2Water. Ve zprávě je uvedeno celkové vyhodnocení technologie mikrosítové filtrace se zařazenou UV desinfekcí s dávkováním peroxidu vodíku.
Celkové vyhodnocení technologie sonolýzy ozonu
Tato zpráva je souhrnem výstupů C2d1, C2d2 a C2d3 projektu LIFE2Water (LIFE13 ENV/CZ/000475, Ověření a vyhodnocení technologií pro terciární dočištění komunálních odpadních vod). Ve zprávě je uvedeno celkové vyhodnocení technologie sonolýzy ozonu.
Celkové vyhodnocení technologie ultrafiltrace s adsorpcí na aktivním uhlí
V přípravě.
Project management plan
The report describes project management. Attention is paid to project implementation (execution of work and control of outputs, communication and dissemination).

Výstupy

Graphical design of the on-site panel
 
Article in the expert journal SOVAK
In May 2015 an article about the LIFE2Water project was published in the expert journal SOVAK.
LIFE2Water in the Šalina magazine
An article about the LIFE2Water project was published in the September issue of the Šalina magazine.
Leaflet for a broad public
 
Seminář k projektu 05/2015
Dne 20. 5. 2015 se v sídle společnosti ALS Czech Republic s.r.o. uskutečnil seminář k projektu LIFE2Water. Na semináři byl představen program LIFE+, projekt LIFE2Water a jeho výsledky. Byly prezentovány pilotní jednotky a první výsledky jejich monitoringu. Důraz byl rovněž kladen na sledované znečištění a na analytické metody využívané k detekci sledovaných látek. Poté následovala prohlídka laboratoří ALS. Výklad se zaměřil na organizaci příjmu a zpracování vzorků, jejich stanovení a report výsledků. Byly představeny analytické přístroje a další vybavení. Po exkurzi v laboratořích následovala diskuze s účastníky semináře.  
Jednání odborné komise SOVAK ČR – exkurze na pilotní lokalitu projektu LIFE2Water
Dne 11. 5. 2016 se k příležitosti jednání odborné komise SOVAK ČR konala exkurze na pilotní lokalitu projektu LIFE2Water. Na exkurzi byl zástupcům vodárenských společností, firem a vysokých škol představen projekt LIFE2Water. Byly představeny jednotlivé pilotní jednotky a prezentovány dosavadní výsledky jejich monitoringu.  
Seminář k projektu 06/2016
Dne 22. 6. 2016 se na Čistírně odpadních vod Brno-Modřice uskutečnil seminář k projektu LIFE2Water. Semináře se zúčastnili zástupci vodárenských společností, firem, státní správy a vysokých škol. Na semináři byl představen projekt LIFE2Water a jeho výsledky. Byly prezentovány pilotní jednotky mikrosítové filtrace s UV zářením a dávkováním peroxidu vodíku, sonolýzy ozonu a ultrafiltrace s adsorpcí na aktivním uhlí a výsledky monitoringu prvních dvou jednotek na odstranění sledovaného znečištění (mikrobiální znečištění, znečištění vybranými chemickými látkami, pesticidy a léčivy). Výklad se zaměřil na trendy sledovaného znečištění v průběhu roku a účinnost jeho odstranění včetně nákladů na vlastní čištění. V závěru byl věnován prostor diskuzi a prohlídce pilotní lokality.  
Newsletter 05/2015
 
Newsletter 05/2016
 
Prezentace projektu LIFE2Water na konferenci Řešení extrémních požadavků na čistění odpadních vod
Projekt LIFE2Water byl představen na konferenci Řešení extrémních požadavků na čistění odpadních vod konané 26. – 27. února 2015 v Blansku.
Prezentace na projektu Hydroanalytika
Projekt LIFE2Water byl prezentován na konferenci Hydroanalytika konané 15. – 16. 9. 2015 v Hradci Králové.
Presentation of the project at conference Městské vody 2015/Urban Water 2015
Project LIFE2Water was presented at conference Městské vody 2015/Urban Water 2015 held on 1st and 2nd October in Velké Bílovice, Czech Republic.
Presentation of the project at conference Rekonštrukcie stokových sietí a čistiarní odpadových vôd
Project LIFE2Water was presented at 9th biennial conference Rekonštrukcie stokových sietí a čistiarní odpadových vôd held from 13th to 15th October in Podbanske, Slovakia.