###### Abstract  
The sequencing batch reactor (SBR) has been increasingly applied in the control of high organic wastewater. In this study, SBR with aerobic granular sludge was used for wastewater treatment in a noodle-manufacturing village in Vietnam. The results showed that after two months of operation, the chemical oxygen demand, total nitrogen and total phosphorous removal efficiency of aerobic granular SBR reached 92%, 83% and 75%, respectively. Bacterial diversity and bacterial community in wastewater treatment were examined using Illumina Miseq sequencing to amplify the V3-V4 regions of the 16S rRNA gene. A high diversity of bacteria was observed in the activated sludge, with more than 400 bacterial genera and 700 species. The predominant genus was _Lactococcus_ (21.35%) mainly containing _Lactococcus chungangensis_ species. Predicted functional analysis showed a high representation of genes involved in membrane transport (12.217%), amino acid metabolism (10.067%), and carbohydrate metabolism (9.597%). Genes responsible for starch and sucrose metabolism accounted for 0.57% of the total reads and the composition of starch hydrolytic enzymes including \(\alpha\)-amylase, starch phosphorylase, glucoamylase, pullulanase, \(\alpha\)-galactosidase, \(\beta\)-galactosidase, \(\alpha\)-glucosidase, \(\beta\)-glucosidase, and 1,4-\(\alpha\)-glucan branching enzyme. The presence of these enzymes in the SBR system may improve the removal of starch pollutants in wastewater. aerobic granular sludge; sequencing batch reactor (SBR); bacterial community; noodle-manufacturing; wastewater treatment; predicted functional analysis 2018/  
activated sludge systems are limited, due to the generally poor settling properties of the sludge [3]. To improve the ability to settle, new technology has been developed using aerobic granular sludge. Granules creating aerobic granular activated sludge are considered as aggregates of microorganisms, mainly bacteria, and extracellular polymeric substances [4]. Aerobic granular sludge also functions as a biofilm in suspension, which is composed of combining cells [5]. The application of granules for wastewater treatment has many advantages. They settle significantly faster than activated sludge flocs (high settling velocity). In addition, granular sludge provides high and stable rates of metabolism [5]. Activity of microbial community in granular sludge directly affects the effectiveness of the biological treatment of wastewater. Therefore, it is important to define the microbial composition as well as the interaction between species in an active treatment system [6]. Microbial diversity in a wastewater treatment plant is usually high with the appearance of bacteria, protozoa, metazoa and other microlife [7], but bacteria still do the major role in degrading organic pollutants in the treatment process. It is known that culture-dependent methods have limitations for studying natural microbial community composition, because only a small part of bacteria in environmental samples are culturable under laboratory conditions [8]. Molecular techniques such as polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) [9; 10; 11], amplified ribosomal DNA restriction analyses (ARDRA) [12], and fluorescence in situ hybridization (FISH) have been widely applied to study the diversity of microorganisms in natural samples [13]. These techniques have significantly overcome the weakness of traditional methods, but only elucidate the major microbial groups in wastewater treatments. Recently, the metagenomic approach has emerged as one of the most effective and popular techniques for investigating microbial diversity and community in activated sludges [14; 15; 16; 17; 18]. The aims of this work are to develop a SBR system for wastewater treatment in a noodle-manufacturing village in Vietnam with high starch concentration, and to investigate the diversity of bacterial communities and their predictive functions presented in aerobic granular sludge, using MiSeq sequencing technique.