The invention discloses a biological aerated filter using barley straws as substrates and an application thereof. The biological aerated filter comprises a filter body, a water inlet
pipe, a water outlet
pipe, an
aeration pipe, a backwash fan, a backwash water pump, a
reflux pump and
filter material, wherein a filler line and a material supplementing line are arranged on the filter body and the
filter material mainly comprises barley straws and active
sludge. By using the barley straws as the filler material of the filter, the raw materials are inexpensive and easily available; the barley straws are only needed to be uniformly mixed with the active
sludge and do not need to be subjected to other pre-treatment operations so that the operation is easy. The barley straws are gradually decomposed in the filter to release
lignin and oxidation products, allelochemical substances such as esters, quinones and
phenols, and the growth of harmful
algae is inhibited by the allelochemical effect of plants; by using
algae in the influent water and gradually decomposed barley straws inside the filter as
biomass organic carbon sources, the biological
denitrification process is promoted, the
water quality is purified, the advantages of low price,
ecological safety and the like are achieved and the method is an environment-friendly and safe
control treatment method for
algae-containing polluted
raw water.