微塑料对序批式生物膜反应器除碳脱氮及N_(2)O释放特征的影响  

Effect of Microplastics on Carbon and Nitrogen Removal and N_(2)O Release Characteristics in Sequencing Batch Biofilm Reactor

作　　者：杨雪梅[1] 苏永祥[1] YANG Xuemei;SU Yongxiang(College of Chemical and Environmental Engineering,Jiaozuo University,Jiaozuo 454000,China)

机构地区：[1]焦作大学化工与环境工程学院,河南焦作454000

出　　处：《水处理技术》2023年第2期93-97,共5页Technology of Water Treatment

基　　金：国家自然科学基金(51908306)。

摘　　要：微塑料是污水中常被检测到的新型污染物,然而微塑料对序批式生物膜反应器同步脱氮及N_(2)O释放特征的探究较少。本工作以实际市政废水为探究对象,建立中试规模的SBBR,考察了不同微塑料浓度(0、0.2、2.0和10.0mg/L)对SBBR长期运行除碳脱氮效率及N_(2)O释放规律的影响,并揭示了相关影响机制。结果表明,低浓度微塑料对SBBR除碳脱氮效率及N_(2)O释放规律影响不明显,但当进水微塑料浓度超过2.0 mg/L,碳脱氮效率呈现下降趋势,N_(2)O产率增加。当微塑料浓度为10.0 mg/L时,稳定时期出水COD维持在35.3~37.9 mg/L,COD和NH_(4)^(+)-N去除效率分别下降至82.4%~83.5%和80.2%~82.3%,低于工况I,此外,N_(2)O产率高达10.2%~10.8%。内聚物分析表明高浓度微塑料降低了PHA和糖原质的净合成,进而导致内碳源消耗脱氮动力不足。比耗氧速率(SOUR)分析表明高浓度微塑料降低了全部微生物代谢活性。Microplastics are novel pollutants frequently detected in wastewater,however,the effects of microplastics on simultaneous nitrogen removal and N_(2)O release in sequencing batch biofilm reactor (SBBR) are less explored.In this work,a pilot scale SBBR was established to investigate the effects of different microplastic concentrations (0,0.2,2.0 and 10.0 mg/L) on the carbon and nitrogen removal efficiency and N_(2)O release in the longterm operation,and the related mechanisms were revealed.The results showed that the effects of low concentration of microplastics on the carbon and nitrogen removal efficiency and N_(2)O release of SBBR were not obvious,but when the concentration of microplastics exceeded 2.0 mg/L,the carbon and nitrogen removal efficiency decreased and the N_(2)O production increased.When the microplastic concentration was 10.0 mg/L,the effluent COD maintained at 35.3~37.9 mg/L,the removal efficiency of COD and NH_(4)^(+)-N decreased to 82.4%~83.5% and 80.2%~82.3%,respectively,which was lower than the working condition I.In addition,the N_(2)O production was up to 10.2%~10.8%.The analysis of polymer showed that high concentration of microplastics reduced the net synthesis of PHA and glycogen,which led to the consumption of internal carbon source and the lack of denitrification power.Specific oxygen uptake rate (SOUR) analysis showed that high concentration of microplastics reduced the total microbial metabolic activity.

关 键 词：微塑料 生物脱氮 N_(2)O 糖原质 比耗氧速率 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]