B. Petrusevski et al., INFLUENCE OF ALGAL SPECIES AND CULTIVATION CONDITIONS ON ALGAL REMOVAL IN DIRECT-FILTRATION, Water science and technology, 27(11), 1993, pp. 211-220
Citations number
13
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
The influence of growth media on the behaviour of cultured algae in di
rect filtration was examined. Cultured Chlorella vulgaris and Selenast
rum capricornutum on. Jaworski and Z-8 media are used for model water
preparation. It was found that the same algal species in the same grow
th phase had different responses under identical treatment conditions.
Also, difference in growth phase influenced their behaviour. Therefor
e. assuming similarity between cultured algae and algae from natural w
aters is highly questionable. The efficiency of the direct filtration
treatment process for the removal of dominant algal species present in
Biesbosch Water Storage Reservoirs was investigated. Different remova
l patterns were found for various algal species. The most difficult to
be removed were Rhodomonas minuta and mu-algae. High removal efficien
cy was found for Stephanodiscus hantzschii and other cylindrical diato
ms. An overall algal biomass removal of 90 % was achieved. Algal penet
ration through filters is a consequence of algal size and inefficient
agglomeration during coagulation. It was found that the application of
oxidants (ozone and potassium permanganate) prior to coagulant additi
on improves the efficiency of direct filtration. The use of H2O2 did n
ot enhance algal removal under the conditions investigated.