兰氏贾第鞭毛虫的来源及处理
Source
Giardia is a protozoan which can exist as a trophozoite, usually 9 to 21 .tm
long, or as an ovoid cyst, approximately 10 um long and 6 um wide. Protozoans
are unicellular and colorless organisms that lack a cell wall. When Giardia are
ingested by humans, symptoms include diarrhea, fatigue, and cramps. The US EPA
has a treatment technique in effect for Giardia.
Treatment
Slow sand filtration or a diatomaceous earth filter can remove up to 99 % of the
cysts when proper pretreatment is utilized. Chemical, ultrafiltration, and
reverse osmosis all effectively remove Giardia cysts. Ozone appears to be very
effective against the cysts when utilized in the chemical oxidation -
disinfection process instead of chlorine. The most economical and widely used
method of removing Giardia is mechanical filtration. Because of the size of the
parasite, it can easily be removed with precoat, solid block carbon, ceramic,
pleated membrane, and spun wrapped filter cartridges.
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