A protozoan with a high degree of danger and widespread in outbreaks that it had already being around the world is the Cryptosoridium spp. parasite, since these oocysts in drinking water can cause serious harm to human health and animal (depending on the species). As Chlorination does not guarantee the inactivation of this organism, so it is necessary which the water treatment plant have effective systems, mainly during the coagulation and filtration process. Thus, the organisms can be blocked during these treatments, enabling improve the drinking water quality. Besides, we must look for alternatives economically viable to the populations who don´t have infrastructure in sanitation, and this way to attempt the important basic parameters of water quality. Alternatives such as filtration systems can be a viable option because it requires low cost materials and easy access, as some construction materials. As coagulant is also possible to use natural coagulants wich can remove suspended particles and reduce the number of many organisms present in water. A natural coagulant used in water treatment in small communities is the seed from the tree Moringa oleifera. Given the importance of eliminating these protozoa in drinking water, this work will aim to employ a system of filtration and natural coagulant from the seeds of Moringa oleifera for removal of Cryptosporidium parvum. Also, before application of the protozoa in the water treatment system of this work will be using polystyrene microspheres of similar size or smaller than the oocysts of Cryptosporidium spp. to complement the assessment of efficacy of these treatments. Thus, is expected to coagulation and filtration system protozoa remain stranded in the processes of coagulation and filtration. Therefore, they can become a viable technical and economical point of water treatment aimed mainly to give people who don´t have conventional treatments.
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