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    Effecten van eutrofiering en hydrologische omstandigheden op fytoplankton in de Maas ; consequenties voor de drinkwaterbereiding

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    Authors
    Ietswaart Th
    Dijk GM van
    Type
    Report
    Language
    nl
    
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    Title
    Effecten van eutrofiering en hydrologische omstandigheden op fytoplankton in de Maas ; consequenties voor de drinkwaterbereiding
    Translated Title
    Effects of eutrophication and hydrological condition on phytoplankton in the river Meuse ; implications for the production of drinking water
    Publiekssamenvatting
    Bij de productie van drinkwater uit oppervlaktewater kunnen algen problemen opleveren. Cyanobacterien kunnen geur- en smaakstoffen en toxines produceren en dringen soms door tot in het halffabrikaat of eindproduct. Kolonievormende kiezel- en groenwieren kunnen van zandfilters verstoppen. Deze problemen treden soms op bij de zuivering van Maaswater. Een aantal potentiele probleemalgensoorten komt voor in de Maas, zoals ketenvormende kiezelwieren die van nature voorkomen, en groen- en blauwwieren die toenemen in geeutrofieerde en gestuwde rivieren, zoals de Maas. Trendanalyse van de soortensamenstelling sinds de jaren '50 wijst op een langzame toename van groen- en blauwwieren. Over de laatste acht jaar is geen duidelijke trend te zien, op enkele extreme cyanobacteriebloeien door warme zomers na. Wel zijn er effecten gevonden van de waterkwaliteit en de hydrologische toestand op de soortensamenstelling van het fyto- en zooplankton in de Maas. In wateren die gevoed worden met Maaswater, zoals de Andelse Maas en de spaarbekkens in de Biesbosch, is het aantal potentiele probleemsoorten veel hoger. Dit wordt hoogst waarschijnlijk veroorzaakt door het stagnerende karakter van het water in die bekkens. Aangezien bijna alle innamepunten van waterleidingbedrijven in dergelijke wateren liggen, is het fytoplankton in die wateren een punt van aandacht.
    Algae can cause problems during drinking water production. Cyanobacteria may produce odourous compounds and toxins, or penetrate filters. Colonial diatoms and green algae can clog up sand filters. These problems sometimes occur during the purification of water from the river Meuse, which is an important source of drinking water in the Netherlands and Belgium. Several potentially problem-causing algal species are found in the Meuse, such as chain-forming diatoms, which are indigenious to rivers, and green and bluegreen algae, which are present in eutrophicated and regulated rivers. A trend analysis of the species composition of Meuse phytoplankton since the 1950's revealed a slight increase of green and bluegreen algae. During the last eight years no trends were apparent. A few extreme cyanobacterial blooms must be attributed to warm summers. Water quality and the hydrological condition of the Meuse did affect the species composition of phytoplankton and zooplankton. Waters that are fed with Meuse water, such as the Andels Meuse and the reservoirs in the Biesbosch, contained much more potentially problem-causing species. This is most probably the result of the higher retention times of the water in those reservoirs. As almost all water companies have their water inlets in such reservoirs, the phytoplankton composition in those waters remains a matter of concern.
    Description
    available from RIWA (Samenwerkende Rijn- en Maaswaterleidingbedrijven), P.O. Box 8169, 1005 AD Amsterdam, fax: 31-20-6881641
    Publisher
    Samenwerkende Rijn- en Maaswaterleidingbedrijven RIWA
    Amsterdam
    Sponsors
    RIWA
    URI
    http://hdl.handle.net/10029/260233
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