Biofilm attachment performances and microbial communities of the carriers in full-scale PN/A process
Due to the relatively slow growth rate of anammox bacteria,the reactor start-up time is usually shortened in industry by adding carrier fillers.In order to evaluate the effect of carriers on the film attachment of anammox bacteria,three carriers,polyurethane(PU),polyethylene(PE)and polyvinyl alcohol(PVA),were tested in a real-scale IFAS reactor treating coal chemical wastewater.At 110d,all three carriers formed mature biofilms,with bio-enrichment of(3.84±0.36)mg VSS/(cm3 filler),(2.40±0.41)mg VSS/(cm3 filler)and(1.82±0.17)mg VSS/(cm3 filler)for PU,PE and PVA carriers,and EPS contents of(0.250±0.022)mg/(cm3 filler),(0.018±0.0031)mg/(cm3 filler)and(0.0096±0.0018)mg/(cm3 filler),respectively;moreover,PU carriers showed more excellent stability and shock resistance in the face of water quality fluctuations and system failure.In addition,the microorganisms in PU carriers had a more complex network topology,which could provide more available substrates and nutrients for microbial habitats,and the microbial interactions were also closer.The above results indicated that PU carriers were more suitable as biofilm carriers for the anammox process than PE and PVA carriers.
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