Abstract
AbstractStrain C was isolated from chicken manure, and its phenotypic characteristics were gram-stain negative, yellow-pigmented, aerobic bacterium, heterotrophic, non-motile, chemoorganotrophic, non-gliding as well as non-spore-forming. A 16S rRNA gene sequence analysis showed that strain C occupied a distinct lineage within the family of the genus Chryseobacterium, and it shared highest sequence similarity with Chryseobacterium solincola strain 1YB-R12 (80%). The new isolate has been studied for removing ammonium-nitrogen (NH4-N) and the optimization of suitable conditions. The strain C was able to degrade over 42.8% of NH4-N during its active growth cycle. Experimental study of the effect of temperature and pH on NH4-N removal showed that the temperature and pH optima for NH4-N removal were 30–35℃ and 4–8, respectively. The results indicated that strain C shows a potential application for wastewater treatment.
Highlights
Ammonium-nitrogen (NH4-N) is the main component of nitrogen in wastewater from the livestock and poultry industries, and its content in wastewater is very high [1]
We studied the effect of temperature and pH on the removal capacity of ammonium-nitrogen of these species
The results indicated that levels of 16S rRNA gene sequence similarity between strain C and strains of recognized species of the genus Chryseobacterium were 99%; the highest sequence similarity was 80% with the Chryseobacterium solincola strain 1YB-R12 [17]
Summary
Ammonium-nitrogen (NH4-N) is the main component of nitrogen in wastewater from the livestock and poultry industries, and its content in wastewater is very high [1]. The nitrification by microbes is one of the most economical and ecological processes for NH4-N removal from wastewater [5,6], and bio-treatment is an effective and low-cost biotechnology for degrading NH4-N content in wastewater [7,8]. NH4-N can be degraded traditionally by both autotrophic-nitrifying and heterotrophic-nitrifying microbes [9,10]. Some heterotrophic-nitrifying bacteria, such as Acinetobacterium baumanii [11], Candida rugosa [12], Candida krusei [13], and Pichia farinosa [14] can convert NH4-N into nitrite (NO2-N) or nitrate (NO3-N). Most bacteria included Alcallgenes faecalis [15], Pseudomonas stutzeri [16], and Rhodococcus species [7], which are capable of nitrification as well as aerobic denitrification
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