how can remove cyanobacteria (algae) from wastewater or other water in high volume(like 30000m3)?
Thanks for your recommendation. But microfilteration not good for me. We should change filters every day. We have larg amount cyanobacteria and algae in my system. Please recommend Chemical treatment?
What kind of system is this?
What is the purpose of the system?
Why do you need to remove bacteria?
Are you okay with any kind of chemicals (are you okay with any kind of side effects?
Water backflow system in industry
We want resycke water and return to system
We remove heavy metal and other compond by filtration and other methids
cyanobacteria is problem for my filter
We don t have problem with chemical compounds and we deet these compound at least
Coagulation and sedimentation is an option.
Shading the tank would minimize the growth of algae.
Dear Maryam Mirbagheri
Cyanobacteria contamination is one of the major growing issues in Sri Lanka water treatment process. Removal of cyanobacteria process beginning with reservoir using sonication device. Here produce the ultra-waves and remove some of the cyanobacteria from the intake.
The second step is micro strainer with backwash facilities of the membrane.
Pre-chlorination is another step but there are lots of drawbacks associated with this method as regarding cyanotoxin releasing.
DAF (Dissolve aeration flocculation) is another effective method for removal of cyanobacteria and algae. According to our analysis, there is a higher removal percentage of cyanobacteria.
The slow sand filter is another good method for removal of cyanobacteria. Here need to maintain backwash system.
Chemical usage can be an environmental problem and if you can removal of cyanobacteria without chemical usage I think it is better.
Cyanobacteria also perfect organism for removal of heavy metal. I have carried out research project topic on In vitro study on Bio removal of Cadmium (Cd 2+) by freshwater cyanobacterium Oscillatoria sp. and its isotherm
https://www.researchgate.net/publication/320298512_03_Wijesekara_WAMA_Wijeyaratne_WMDN_and_Manage_PM_2016_In_vitro_Study_on_Bio_Removal_of_Cadmium_Cd2_by_freshwater_Cyanobacterium_Oscillatoria_sp_and_its_Isotherm_21st_International_Forestry_and_Environ
Try to do new thing combination with cyanobacteria to the removal of heavy metal
Can be controlled by:
a) by controlling addition of sewage rich in phosphates and inorganic pollutants or adding water treatment
b) by shaing effect,
c) by using algicides like coppersulphate etc,
d) by biological control using phytoplanktivorous fishes like silver carp, and
e) by harvesting the algae.
Coagulation with copper or aluminium sulfate. Doses depends on the composition and abundance of algae. Jar Tests must be done to determine it.
You can try using Hydrogen Peroxide. It has been applied in the Netherlands in natural water bodies.
Thanks for your answer
How much H202 we use per m3?
How can spread H202 in 300000m3?
Hello Maryam,
As Dr. Manoj said "Chemical usage can be an environmental problem". So, try to use a nature-based solution to remove Cyanobacteria and other contaminants.
In this case, the use of submerged macrophytes with allelopathic potential is a better way to achieve your goals. Submerged macrophytes can release allelochemicals that inhibit Cyanobacteria fastly, besides they can also absorve phosphorus and other harmful compounds, like cyanotoxins, heavy metals, pharmaceuticals, and others.
Some macrophytes can also biotransform the contaminants in less toxic compounds. But I suggest to remove the plants after they reduce Cyanobacteria and phosphorus, because as macrophytes die, they release the contaminants into the water again if the biotransformation is not so efficient.
In a biomanipulation study in a shallow lake with a dense Cyanobacterial bloom (~300 mg.L) I get great results with Ceratophyllum demersum, with reductions in Cyanobacterial biomass greater than 85% in ten days, with a biomass of only 3.5 g per 100 L. If the experiments lasted more, macrophytes could remove the total amount of Cyanobacteria.
Best regards,
Cihelio Alves Amorim
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