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高盐环境微生物的分离、鉴定及其在含盐废水处理中的应用研究
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摘要
嗜盐菌是一类生长在盐湖、海洋等高盐环境下的微生物,生理性质独特,在理论和应用方面都具有很高的研究价值。本研究主要对新疆阿尔金山自然保护区阿牙克库木湖、浙江沿海盐场和中国东海嗜盐微生物进行分离和多样性分析,对部分菌株进行多相分类学研究,并将嗜盐微生物应用于含盐废水处理过程,构建了在高盐环境下高效降解污染物的嗜盐微生物群落。
     本研究从从新疆阿尔金山自然保护区阿牙克库木湖、浙江沿海盐场和中国东海分离出454株嗜(耐)盐菌。从中挑选了139株进行了16S rRNA基因序列测定和分析,结果表明在三种盐环境下分离的嗜盐微生物类型有很大差异。阿牙克库木湖测序菌株古菌占65%,其中以Halorubrum属菌株最多。盐场测序菌株中古菌仅占31%,厚壁菌门(Firmicutes)成员占43%,Halobacillus属成员所占比例最大。海洋样品测序菌株多样性最高,全部为真细菌,其中67.5%属于变形菌门,Marinobacter属的成员在所测菌株中比例最高,其次为Halomonas属。
     分离菌株中多株与相近物种具有较远的遗传距离,本研究对分离自榨菜废水反应器的菌株FS24、分离自中国东海的菌株908115和ILY2进行了多相分类学研究,结果表明这三株菌分别代表Citricoccus、Marinobacter和Alcanivorax属下新的分类单元。分别命名为Citricoccus zhacaiensis sp.nov.,Marinobacter donghaiensissp.nov.和Alcanivorax ningii sp.nov.
     含盐废水因其高盐特性使一般微生物无法在其中正常生长,对废水生物处理产生毒害作用,使污水处理站对高盐污水的处理效果大幅度降低而无法达到国家排放标准。对废水稀释处理又会造成能源和水资源的浪费,使处理设施庞大、投资增加,运行费用提高。嗜盐微生物生活在高盐环境下,在漫长的地质年代里形成了对盐特殊的适应性。本研究从高盐废水的特点出发,从天然高盐环境中筛选分离适应含盐废水环境的微生物,通过测定菌株对污染物的降解效果和生理生化特性,构建了高效处理榨菜废水的菌群,可高效去除废水中的COD,针对榨菜废水原液低pH的特点,筛选了可提高废水pH的微生物,与高效菌配合使用即可自动调节废水pH,又能迅速降低废水COD。
     我国具有丰富的高盐环境资源,海洋国土辽阔,盐场数量众多,盐湖星罗棋布,对高盐环境微生物资源的开发和利用,可提高人们对于高盐生态系统和高盐环境下生命现象的认识,为高盐污染物治理提供材料和科学依据,嗜盐微生物的酶类在工业生产中也具有很好的应用前景。
Halophile is a kind of microorganisms which live in high saline environments, such as salt lakes and the ocean. Their special biological characteristics have a great research and application value, and they have been taken particularly interests in recent years. In this study, we investigated the biodiversity of cultured halophiles from Ayakekum Lake in Xinjiang region, salterns in Zhejiang and the East China Sea. A systematic study had been conducted on the taxonomy of three isolates. We also constructed a high efficiency halophilic bacteria group to treat the saline wastewater.
     We isolated 454 halophilic and halotolerant microorganisms from Ayakekum Lake in Xinjiang region, salterns in Zhejiang and the East China Sea and 139 of them have been taken into 16S rDNA study. Phylogenetic analysis based on 16S rRNA genes of these strains indicated that members in this three kind of saline environments are different. About 65% of the isolates from Ayakekum Lake were halophilic archaea, and members of Halorubrum share the greatest proportion. As for saltern samples, about 43% of the isolates were Firmicutes members, and members of the genus Halobacillus were more than the other groups. Only 31% of isolates were archaea. Isolates from sea water samples showed highest biodiversity. All of the isolates from sea water sample were bacteria, and 67.5% of them belong to Proteobacteria. Number of isolates belong to the genus Marinobacter were the biggest among isolated sea bacteria, followed by the Halomonas species.
     Several isolates show long distance from their closely related species, and the morphology, physiology, biochemical features, polar lipid composition, 16S rRNA genes and DNA-DNA relatedness of three strains, FS24, 908115 and LY2, were characterized in order to elucidate their taxonomic status. Our results indicate that these strains represent three novel species. The names Citricoccus zhacaiensis sp. nov., Marinobacter donghaiensis sp. nov.and Alcanivorax ningii sp. nov. are proposed.
     Most microorganisms in wastewater treating systems can not grow in high saline environment, so when saline wastewater was charged in to wastewater treating system, the treating efficency is usually very low. One solution to this problem is to dilute high saline wastewater to a salt concentration lower than 1%, then the wastewater treating system can work with a high efficency, but this require large quantity of freshwater. Halophilic microorganisms formed particular Adaptation to saline invironments during the process of evolution and show potential in saline wastewater treatment. In this study, strains were isolated from saline environments and applied to wastewater treating systems. High efficency bacteria group was conducted, and the member of this group can not only remove COD of wastewater, but aslo raise the pH of the wastewater. The ability to raise pH value is important for wastewater with low pH, such as the wastewater from production of pickled vegetables.
     China has various kinds of high saline environments, and lots of unknown halophilic microorganisms are still waiting for exploration. As halophilic microorganisms are special in physiology, besides the application in wastewater treatment, they might be expected to have enzyme repertoires that are so far unprospected and potentially interesting for biocatalysis and the enzymatic biosynthesis of fine chemicals.
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