SDS enhanced the hydrolysis effect of sediment in drainage pipe network by compound enzyme
SDS combined with the compound enzyme were used to hydrolyze the sediment of drainage pipe network.The effects of SDS dosage,reaction time,pH and temperature on the hydrolysis of the sediment were discussed.The mechanism was analyzed by SEM,EPS,3D-EEM and particle size characterization methods.The results showed that the best hydrolysis effect of the sediment happened at 5％(w/w)SDS and 8％(w/w)compound enzyme,pH(7.28±0.3)of raw sediment,25 ℃ and reaction for 2 h.Under these conditions,SCOD,polysaccharide and ammonia nitrogen increased from the initial values of 5 686.9mg·L-1,1 913.75mg·L-1 and 87.32mg·L-1 to 8 192.9,3 561.29 and 153.37mg·L-1,respectively.Organic matter content decreased from 56.32％to 55.59％.After treated by SDS+compound enzyme,the internal compact structure of sediment was destroyed,TB-EPS transferred to S-EPS,and the fluorescence intensity of humic acids increased,which indicated the increase of the dissolved EPS,and the particle size of sediment decreased to smaller than 300 μm.The results of high-throughput sequencing technology showed that SDS+compound enzyme had slight impact on the richness and diversity of microbial species in the sediments,but it could alter the functional microbial community of microorganisms to same extent,and reduced the production of CH4 and H2S.The results of this study provide a new method and data support for delaying the silting problem of the drainage pipe network.
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