摘要:
应用序批式生物膜反应器(SBBR)处理实际垃圾渗滤液,在DO浓度分别为0.45mg·l-1和1.19mg·l-1条件下,研究了系统的有机物,氨氮和总氮去除特性以及游离氨(FA),DO对系统同步硝化反硝化(SND)类型的影响.250d试验研究表明:SBRR系统能够稳定高效地同步去除渗滤液内高浓度有机物和高浓度氨氮.在初始COD浓度为122—2385mg·l-1的情况下,出水COD浓度为23—929mg·l-1,有机物最大去除速率25.6kgCOD·m-2载体·d-1.在初始NH4+-N浓度为40—396.5mg·l-1的情况下,出水NH4+-N浓度为0—41.2mg·l-1,最大硝化速率2.87kgN·m-2载体·d-1.SBBR系统内发生了明显的同步硝化反硝化(SND)现象,TN平均去除率分别为73.8%(DO=0.45mg·l-1)和30%(DO=1.19mg·l-1)左右.当FA浓度在1.5—11.6mg·l-1范围内时,系统中共存硝酸型SND和亚硝酸性SND.当FA从18.6mg·l-1增加到56mg·l-1,系统中形成稳定的亚硝酸SND.因此,FA是影响系统SND类型的主要因素,DO可促进亚硝酸性SND向硝酸型SND转化.
Abstract:
The removal of COD,NH4+-Nand TNwas studies in a sequencing batch biofilm reactor(SBBR)treating landfill leachate at different DOconcentrations.The effect of free ammonia(FA)and DOon the type of simultaneous nitrification and denitrification was investigated.The experimental results clearly showed that the simultaneous removal of CODand ammonia nitrogen from landfill leachate were achieved in SBBR.When influent CODand NH4+-Nconcentrations were 122—2385 mg·l-1 and 40—396.5 mg·l-1,the effluent COD,NH4+-Nconcentations were 23—390 mg·l-1 and 0—41.2 mg·l-1,respectively.The maximum removal rate of CODand NH4+-Nwere 25.6 and 2.87 kgCOD·m-2·carrier·d-1,respectively.Simultaneous nitrification and denitrification(SND)was observed in the SBBR.The average TNremoval efficiency was 73.8% at DO=0.45 mg·l-1 DOand 30% at 1.19 mg·l-1DO,respectively.When FAwas increased from 1.5 to 11.6 mg·l-1,the SNDvia nitrate and nitrite coexisted in the SBBRsystem.FAwas increased continuously from 18.6 mg·l-1 to 56 mg·l-1,the steady SNDvia nitrite was achieved in SBRR.It was concluded that FAwas the main factor which influenced the type of SND.And DOpromoted the conversion from SNDvia nitrite to SNDvia nitrate.
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