Biocides in Stormwater Pond Sediments. Soprtion, Degradation and Microbial Inhibition
Author
Valkonen, Kaisa Eveliina
Term
4. term
Education
Publication year
2014
Submitted on
2014-06-10
Pages
61
Abstract
Maling og puds på bygninger kan indeholde biocider (kemikalier, der dræber uønskede organismer) som antifoulingmidler for at forhindre begroning. Når det regner, kan disse stoffer blive skyllet af facaderne og ende i naturen. De kan være skadelige for vandmiljøet, men sedimenter kan muligvis mindske effekten ved at binde dem (sorption) og ved, at mikroorganismer nedbryder dem (biologisk nedbrydning). Denne undersøgelse testede sedimenter fra to regnvandsbassiner (forsinkelsesbassiner) i Aarhus og Silkeborg. I laboratoriet lavede vi suspensionsforsøg (sediment blandet med vand) for at undersøge sedimenternes potentiale for sorption og nedbrydning af biociderne Diuron, Terbutryn og Cybutryn. Sorption blev også undersøgt i intakte sedimentkerner (u-forstyrrede prøver), og vi målte, om dosering af biocider hæmmede de naturlige mikroorganismer i prøverne. Resultaterne tyder på, at biociderne kan nedbrydes i sedimenterne, og at mindst ét af de testede biocider hæmmer den mikrobielle aktivitet.
Paints and renders on buildings can contain biocides (chemicals that kill unwanted organisms) as antifoulants to prevent growth. Rain can wash these substances off façades and carry them into natural waters. These compounds may harm aquatic ecosystems, but sediments might reduce their impact by binding them (sorption) and through microbial breakdown (biodegradation). This study tested sediments from two stormwater detention ponds in Aarhus and Silkeborg. In laboratory suspension experiments (sediment mixed with water), we assessed the sediments’ potential for sorption and biodegradation of the biocides Diuron, Terbutryn, and Cybutryn. We also examined sorption in intact sediment cores (undisturbed samples) and measured whether dosing with biocides inhibited the native microbial communities. The results indicate that the biocides can be degraded in the sediments, and that at least one of the tested biocides inhibits microbial activity.
[This abstract was generated with the help of AI]
Keywords
Documents