Abstract
Activated sludge process is one of the wastewater treatment method that is applied for many wastewater types including painting process wastewater of automotive industry. This wastewater is well-known to have high heavy metals concentration which could deteriorate water environment if appropriate performance of the wastewater treatment could not be achieved. In this study, we monitored microbial community diversity in a Painting Biological Treatment (PBT) system. We applied a combination of cultivation and genotypic biological methods based on 16S rRNA gene sequence analysis to identify the diversity of active microbial community. The results showed that active microbes that could grow in this activated sludge system were dominated by Gram-negative bacteria. Based on 16S rRNA gene sequencing analysis, it was revealed that their microbial diversity has close association with Bacterium strain E286, Isosphaera pallida, Lycinibacillus fusiformis, Microbacterium sp., Orchobactrum sp., Pseudomonas guariconensis, Pseudomonas sp. strain MR84, Pseudomonas sp. MC 54, Serpens sp., Stenotrophomonas acidaminiphila, and Xylella fastidiosa with similarity of 86 – 99%. This findings reflects that microbial community in a Painting Biological Treatment (PBT) system using activated sludge process could adapt with xenobiotics in the wastewater and has a wide range of diversity indicating a complex metabolism mechanism in the treatment process.
Highlights
Every production process carried out by industry produces wastes that require further processing they cannot be directly discharged into the environment
Wastewater in Painting Biological Treatment (PBT) unit is originated from metal painting process
The results of dissolved oxygen (DO) measurements showed values ranging from 1.1±0.14 5.94±0.06 mg/L
Summary
Every production process carried out by industry produces wastes that require further processing they cannot be directly discharged into the environment. These wastes were resulted from the production process as well as waste treatment process. The industrial waste must be treated before being discharged into the environment to prevent environmental pollution, one of which can be due to the presence of heavy metal content. One of the wastewater treatment is biological treatment by indigenous bacteria that are environmentally friendly. This treatment configuration will be more effective, inexpensive and sustainable compared to conventional (physico-chemical) methods [3]. Biological methods can be an attractive choice for conserving water usage through treatment of water produced from wastewater [4]
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