螺旋形生物膜载体对微生物及水质净化影响研究

Experimental Study on Effects of Spiral Bio-film Carriers on Water Purification

柔性生物膜载体常作为填料悬挂于生态浮床等构筑物下方,为微生物生长提供附着表面。目前柔性生物膜载体对水质净化效果影响研究集中在载体类型和悬挂密度等方面。为进一步提高载体上与水质净化相关的微生物数量,达到提升水质净化效果的目的,该研究通过改变柔性生物膜载体悬挂方式(螺旋式悬挂),并设置高低2种污染负荷进行模拟污染水体研究,研究了不同悬挂方式对柔性生物膜载体挂膜和净化水质效果的影响。结果显示,出水稳定期间高、低2种污染负荷条件下螺旋式悬挂组柔性载体对进水总磷、总氮、氨氮和COD的去除率均大于常规式悬挂组(P<0.05)。相比常规组,螺旋组对这4个指标分别提高了19.4%~30.0%、19.2%~35.7%、18.3%~24.0%和12.0%~15.3%。载体挂膜量及其菌群结构数据显示,螺旋式悬挂可通过改善氧环境以及提高挂膜量显著提升载体生物膜中与氮磷转化相关的微生物数量,并且水质净化效果与氮磷转化相关的微生物数量大小一致。

Flexible biofilm carrier is usually hanged underneath the structures(e.g.ecological floating bed)as a filler to provide surface for microbial growth,and the present studies focus on the effects of carrier type and hanging density on water purification.In this paper,for the purpose of further increasing the population of microorganisms to enhance the efficiency of water purification,a bench-scale experiment with the varied hanging patterns,for example spiral hanging pattern,was conducted investigating the effects of different hanging patterns on the biomass and water purification under the condition of either high or low pollution loading.The experimental study concluded that the removal efficiency of four water quality parameters(total phosphorus,total nitrogen,ammonia nitrogen and COD)by using the carrier of spiral hanging pattern group(L)were higher than the ordinary hanging pattern group(C)(P<0.05)irrespective of pollution loading(high or low):the increases in terms of the above four parameters was 19.4%~30.0%,19.2%~35.7%,18.3%~24.0%and 12.0%~15.3%,respectively,aside from that,biomass on the carrier and its microbial community structure showed that the spiral hanging pattern could significantly improve the oxygen environment and boost the carrier biomass and then enhance the population of microorganisms related to nitrogen and phosphorus transformation.Meanwhile,the water purification effect was consistent with the population of microorganisms related to nitrogen and phosphorus transformation.